Research mission

The Physical Metallurgy group focuses on the development of metallic and intermetallic materials for extreme application conditions. The investigation and optimization of materials for engines operating at high temperatures is of central interest. Outstanding high temperature stability (mechanical and microstructural) in conjunction with reasonable toughness at room temperature as well as suitable oxidation resistance are the main objectives in this case. Further, other extreme application conditions became relevant, for example deformation at cryogenic temperatures close to 0 K. The research activities all have the identification of fundamental mechanisms of the important phenomena, their relationship to materials properties and application to materials tailoring in common. In order to address these objectives, we routinely apply various materials synthesis techniques and scale-bridging characterization methods.

Synthesis of new materials

The synthesis of new materials is based on the following methods that are available in house:

  • melting technologies: arc melter and zone melting
  • powder metallurgy: attritor grinding mill, planetary ball mill, hot uniaxial pressing
  • heat treatments in various atmospheres

Methods of characterization

The characterization of mechanical and thermo-physical properties as well as microstructure of metallic and intermetallic materials is performed by means of:

  • standard metallographic procedures
  • mechanical testing under various loading conditions (tension, compression, cyclic, creep conditions, various atmospheres)
  • thermal analysis: thermogravimetry (TGA) and differential scanning calorimetry (DSC)
  • focused ion beam (FIB) for microscopic preparation
  • analytical scanning electron microscopy: energy-dispersive X-ray spectroscopy (EDX) and electron backscatter diffraction (EBSD)
  • X-ray diffraction (XRD)
  • 3D atom probe tomography (APT)

Arc melting

Microstructure analysis
Ultrasonic atomization
Scanning electron microscopy
Microstructure analysis
Directional solidification
Materials characterization
Microstructure analysis
Materials synthesis

Powder handling


materials KIT, M. Breig
Materials Development
hea laube
High Entropy Alloys
phm phm
Additive Manufacturing
atome probe tomography KIT, M. Breig
Atom Probe Tomography

News

artdyck
Revisiting analytic shear-lag models for predicting creep in composite materials

Analytical descriptions of materials response are important for experimental materials science as they allow quick and efficient assessment of apparent fundamental mechanisms. However, these analytical models are frequently used beyond their limits. In our latest publication with the colleagues of Institute of Engineering Mechanics at Karlsruher Institut für Technologie (KIT), we propose modifications of the commonly applied Kelly-Street model to describe the stationary creep response of fibrous composites. By a modification of the inclusion spacing formulation and introduction of stress compatibility across the fiber-matrix interfaces along the loading direction, reproduction of experimental and simulated data in an extended parameter range is obtained. ITM's modern FFT-based micromechanical simulation schemes were used to validate the novel model description.

zu Scripta Materialia
artlaube
Formation and thermal stability of two-phase microstructures in Al-containing refractory compositionally complex alloys

Compositionally complex alloys (CCA) based on refractory metals are promising candidates as structural materials for high-temperature application. However, many alloys investigated so far suffer from low plastic deformability at room temperature, which limits a possible application. This was attributed to a combination of undesirable (intermetallic) phases with an ordered crystal structure of the matrix (Laube et al. in Acta Materialia 218 (2021) 117217).

In our recent study, the following objectives were addressed in more detail: (i) phase separation, (ii) precipitate growth and coarsening, as well as (iii) the influence of precipitates on the mechanical properties. In collaboration with the research groups of Prof. H.-J. Christ at the University of Siegen as well as of Prof. Y. Eggeler and Prof. C. Greiner, the phase separation was investigated on multiple time and length scales. The B2 phase formation is a diffusion-controlled, discontinuous phase transformation with sharp, moving interfaces. Thus, spinodal decomposition was invalidated for the present alloy as oppposed to the suspects in other CCA.

In the investigated temperature range of 800 to 1000 °C, the microstructure showed little tendency to grow or coarsen, which is positive considering a possible application under creep conditions. A correlation of hardness to inter-particle distance and volume fraction was established and revealed that the highest hardness can be obtained at 800 °C.

to STAM
art37tirunilai
Phase continuity, brittle to ductile transition temperature and creep behavior of a eutectic Mo-20Si-52.8Ti alloy

Mo–Si–Ti alloys, like eutectic Mo–20Si–52.8Ti (at%), have previously shown excellent oxidation resistance at high temperatures. The present article investigates high temperature mechanical properties, to confirm the suitability of Mo–20Si–52.8Ti for high temperature structural applications. This investigation consists of (i) detailed microstructural analysis via 3D focused ion beam (FIB) based tomography, in collaboration with colleagues from Saarland University, (ii) brittle to ductile transition temperature (BDTT), determined through bending tests, and (iii) high temperature creep performance comparing tensile and compressive creep results. 3D microstructure reveals that both phases in the alloy, the Mo solid solution (MoSS) as well as the (Ti,Mo)5Si3, are similar in feature size, distribution and volume fraction. Both phases are intensely interconnected indicating no distinct matrix phase. The bending tests indicate a BDTT of 1100-1150 °C as a result of the severely interconnected ductile MoSS and brittle (Ti,Mo)5Si3 phases. The ductile phase also results in crack bridging and trapping above the BDTT, showing that it plays a crucial role in increasing the energy necessary for crack propagation. The tensile creep results are consistent with the previously obtained compressive creep results (Schliephake et al. Intermetallics 104 (2019) 133). The consistency was observed both in terms of creep rates as well as microstructural features in the deformed specimens. This indicates that regardless of loading state creep performance is consistent in Mo–20Si–52.8Ti.

to Advanced Engineering Materials
arthinrichs
A novel nitridation- and pesting-resistant Cr-Si-Mo alloy

Improvement of oxidation resistance and understanding of oxidation protection mechanisms in refractory metal based alloys is still focus of our research. In our recent publication with Dechema FI and LEM in the framework of the Research Training Group 2561, we present a novel alloy from the Cr-Si-Mo system with respect to its oxidation resistance between 800 and 1200 °C. Cr promises the formation of a passivating Cr2O3 layer. Si might further increase the oxidation resistance of the Cr-based alloy, while Mo increases the solidus temperature of the alloy and thus potentially improves creep resistance.

The alloy was prepared by a standard arc melting process and solidified to a monolithic intermetallic compound. A heat treatment was used to induce a solid state decomposition reaction into a fine structured, two-phase microstructure. Cyclic oxidation tests showed that the alloy has exceptionally high oxidation resistance at 800 °C due to the formation of a dense Cr2O3. Spallation, nitridation or the evaporation of volatile oxides, as often observed in Cr- and Mo-based alloys, do not occur. Even at 1100 °C, parabolic scale growth is observed without weight and scale losses due to evaporation. Significant internal oxidation only occurs at 1200 °C. The good oxidation properties are mainly attributed to the homogeneous distribution of Cr between the constituent phases. The resistance to nitridation is explained by the formation of a Mo-rich region below the Cr2O3 layer.

to Corrosion Science
art
Improved work hardening capability and ductility of an additively manufactured and deformed Al-Mn-Mg-Sc-Zr alloy

Most ultra-fine grained Al alloys show very limited work hardening capability due to their very high stacking fault energy. This is also the case with additively manufactured precipitation strengthened Al-Mn-Mg-Sc-Zr alloys, which we are investigating together with our colleagues at Monash University. Over the course of our investigations into the precipitation behavior of this alloy after additional rotary swaging at IFW Dresden, we noticed not only the accelerated precipitation nucleation and growth due to the high defect density, but also the increase in work hardening during tensile tests. The latter becomes apparent after a suitable heat treatment, which, in contrast to the additively manufactured alloy, additionally leads to a significant increase in uniform elongation at almost unchanged strength. The change in the interaction between precipitate particles and dislocations from cutting the precipitates to bypassing them was identified as the cause and will be verified by appropriate characterization methods in our ongoing research.

to Journal of Alloys and Compounds
arteusterholz
High-temperature ternary oxide phases in Ta/Nb-Alumina composite materials

Components in high-temperature applications such as melt-casting processes are subjected to large thermal gradients. A significant increase in the thermal shock resistance of the refractory ceramics used can be achieved by introducing a metallic component and resistive pre-heating. Due to their similar thermal expansion behavior, aluminum oxide together with the refractory metals Nb or Ta are promising combinations. During the sintering of the composites, the possible formation of further phases through a reaction of the powders with each other or with the environment has a decisive influence on the material properties. X-ray diffractometry and scanning electron microscopy reveal that samples of Al2O3 and Nb form the binary oxide NbO, while in Al2O3-Ta the ternary compound AlTaO4 (aluminum tantalate) in its tetragonal high-temperature modification is present. Thermodynamic calculations also show that the changing oxygen solubility in the Nb or Ta solid solutions is responsible for the formation of NbO or AlTaO4 and explain the lack of a ternary phase (AlNbO4) corresponding to aluminum tantalate.

to Advanced Engineering Materials
arttirunilai
Simultaneous twinning and microband-induced plasticity of a compositionally complex alloy with interstitial Carbon at cryogenic temperatures

(Fe40.4Ni11.3Mn34.8Al7.5Cr6)C1.1 is an interstitial high entropy alloy (HEA) that shows excellent mechanical behavior at room temperature (RT), attributed to the Taylor lattice and microband formation during deformation (Wang et al., Acta Materialia 120 (2016) 228 - 239). The present collaborative study with colleagues from Dartmouth College and ITEP investigates mechanical behavior at low temperatures through cryogenic tensile testing, verifying if these deformation mechanisms extend to or change at such temperatures. Taylor lattices and microbands, seen during RT deformation, are characteristic of intermediate to high stacking fault energy (SFE) metals/alloys, but decreasing temperatures have been associated with lowering the SFE in FCC metals and alloys. This article highlights that (Fe40.4Ni11.3Mn34.8Al7.5Cr6)C1.1 surprisingly retains microband formation during cryogenic deformation (down to 4 K), while also exhibiting deformation twinning, generally associated with intermediate to low SFE metals and alloys. The latter point is an extension of the intense solid solution strengthening from interstitial C, increasing the yield stress intensely with decreasing temperature, allowing stress during deformation to exceed twin stress. (Fe40.4Ni11.3Mn34.8Al7.5Cr6)C1.1 thus benefits from both microband formation and deformation twinning at cryogenic temperatures, even though these deformation mechanisms are not generally observed simultaneously.

High Entropy Alloys & Materials
artschulz
Role of orientation relationship for the formation of morphology and preferred orientation in NiAl-(Cr,Mo) during directional solidification

Our preliminary work already showed that for the resulting microstructure in NiAl-(Cr,Mo) alloys,nucleation selection is decisive rather than the growth of the constituting phases (Gombola et al. in Metals 10 (2020) 961). The fundamental reason for the formation of lamellar or fibrous morphology remained open and was now addressed in our recent contribution to Acta Materialia. The article resolves the ambiguities in literature regarding the formation of preferred crystallographic orientations during directional solidification and discusses their dependence on composition and growth rate. Moreover, an independency of the morphology and preferred orientation from each another was demonstrated. However, the morphology is controlled by the orientation relationship as demonstrated by the simultaneous appearance of colonies with two different orientation relationships and different morphologies.

to Acta Materialia
artkauffmann
Revealing the Role of Cross Slip for Serrated Plastic Deformation in Concentrated Solid Solutions at Cryogenic Temperatures

Serrated plastic deformation is an intense phenomenon in CoCrFeMnNi at temperature of and below 35 K with stress amplitudes in excess of 100 MPa. While previous publications have linked serrated deformation to dislocation pile ups at Lomer-Cottrell (LC) locks, there exist two alternate models on how the transition from continuous to serrated deformation occurs. One model correlates the transition to an exponential LC lock density–temperature variation. The second attributes the transition to a decrease in cross slip propensity based on temperature and dislocation density. In order to evaluate the validity of the models, a unique tensile deformation procedure with multiple temperature changes was carried out in collaboration with IFW Dresden and ITEP at KIT, analyzing stress amplitudes subsequent to temperature changes. The analysis provides evidence that the apparent density of LC locks does not massively change with temperature. Instead, the serrated plastic deformation is likely related to cross slip propensity.

 

This article is dedicated to our collaborator and friend Prof. Dr.-Ing. Hans Jürgen Christ. We appreciate our long-standing and fruitful collaborative work in the development of refractory metal-based alloys for high temperature application.

to Metals

Doctoral theses


Cryogenic deformation of CoCrFeMnNi with a focus on serrated plastic deformation. PhD dissertation
Srinivasan Tirunilai, A.
2021, August 11. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000136244
Struktur-Gefüge-Eigenschaftsbeziehungen in eutektischen Legierungen des NiAl-Cr-Mo-Systems. PhD dissertation
Schulz, C. A.
2021, August 10. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000136223
Characterisation of the Oxidation and Creep Behaviour of Novel Mo-Si-Ti Alloys. PhD dissertation
Obert, S.
2021, June 11. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000133636
Creep behavior of lamellar FeAl/FeAl2 alloys. PhD dissertation
Schmitt, A.
2020, April 6. Verlag Dr. Hut
Gefüge und Eigenschaften von äquiatomaren Legierungen aus dem System Ta-Nb-Mo-Cr-Ti-Al. PhD dissertation
Chen, H.
2020, April 7. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000118090
Gefügeentwicklung von CuCr-Kontaktwerkstoffen nach Einwirkung eines Lichtbogens im Vakuum. PhD dissertation
Hauf, U.
2018. Karlsruher Institut für Technologie (KIT)
Der Einfluss von Fe auf Ti-haltige Mo-Si-B Legierungen: Phasenbildung, Gefüge und Kriechverhalten. PhD dissertation
Schliephake, D.
2017. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000073537
Mechanische und oxidative Eigenschaften eutektischer Nb-Si-Cr - Legierungen. PhD dissertation
Gang, F.
2016. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000063623
Mechanical properties and oxidation behavior of micro-alloyed iron aluminides. PhD dissertation
Janda, D.
2015. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000046125

Publications


2023
Formation of rutile (Cr,Ta,Ti)O₂ oxides during oxidation of refractory high entropy alloys in Ta-Mo-Cr-Ti-Al system
Schellert, S.; Weber, M.; Christ, H. J.; Wiktor, C.; Butz, B.; Galetz, M. C.; Laube, S.; Kauffmann, A.; Heilmaier, M.; Gorr, B.
2023. Corrosion Science, 211, 110885. doi:10.1016/j.corsci.2022.110885
Revisiting analytic shear-lag models for predicting creep in composite materials
Dyck, A.; Wicht, D.; Kauffmann, A.; Heilmaier, M.; Böhlke, T.
2023. Scripta Materialia, 224, Article no: 115142. doi:10.1016/j.scriptamat.2022.115142
The effect of Bi doping on the thermal conductivity of ZnO and ZnO:Al thin films
Correia, F. C.; Ribeiro, J. M.; Ferreira, A.; Reparaz, J. S.; Goñi, A. R.; Boll, T.; Mendes, A.; Tavares, C. J.
2023. Vacuum, 207, Art.-Nr.: 111572. doi:10.1016/j.vacuum.2022.111572
2022
Improved work hardening capability and ductility of an additively manufactured and deformed Al-Mn-Mg-Sc-Zr alloy
Schliephake, D.; Lopes, C.; Eggeler, Y. M.; Chen, H.; Freudenberger, J.; Bayoumy, D.; Huang, A. J.; Kauffmann, A.
2022. Journal of Alloys and Compounds, Artkl.Nr.: 166499. doi:10.1016/j.jallcom.2022.166499
Directed energy deposition of γ/γ’ Co-Al-W superalloys
Yoo, B.; Jung, C.; Ryou, K.; Choi, W. S.; Haußmann, L.; Yang, S.; Boll, T.; Neumeier, S.; Choi, P.-P.
2022. Additive Manufacturing, 103287. doi:10.1016/j.addma.2022.103287
Solid solution strengthening in medium- to high-entropy alloys
Freudenberger, J.; Thiel, F.; Utt, D.; Albe, K.; Kauffmann, A.; Seils, S.; Heilmaier, M.
2022. Materials Science and Engineering: A, 861, 144271. doi:10.1016/j.msea.2022.144271
Improving the intermediate- and high-temperature strength of L1-Co(Al,W) by Ni and Ta additions
Chen, Z.; Kishida, K.; Inui, H.; Heilmaier, M.; Glatzel, U.; Eggeler, G.
2022. Acta Materialia, 238, Art.-Nr.: 118224. doi:10.1016/j.actamat.2022.118224
A novel nitridation- and pesting-resistant Cr-Si-Mo alloy
Hinrichs, F.; Kauffmann, A.; Tirunilai, A. S.; Schliephake, D.; Beichert, B.; Winkens, G.; Beck, K.; Ulrich, A. S.; Galetz, M. C.; Long, Z.; Thota, H.; Eggeler, Y.; Pundt, A.; Heilmaier, M.
2022. Corrosion Science, 207, Art.-Nr.: 110566. doi:10.1016/j.corsci.2022.110566
Effect of heat treatment on the electrical and mechanical properties of a Cu–Ni–Si cast alloy
Atapek, Ş. H.; von Klinski-Wetzel, K.; Heilmaier, M.
2022. Materialpruefung/Materials Testing, 64 (8), 1103–1111. doi:10.1515/mt-2022-0022
Interface reactions of magnetron sputtered Si-based dual layer coating systems as oxidation protection for Mo-Si-Ti alloys
Anton, R.; Hüning, S.; Laska, N.; Weber, M.; Schellert, S.; Gorr, B.; Christ, H.-J.; Heilmaier, M.; Schulz, U.
2022. Surface and Coatings Technology, 444, 128620. doi:10.1016/j.surfcoat.2022.128620
Plastic deformation of bulk and micropillar single crystals of Mo₅Si₃ with the tetragonal D8 structure
Kishida, K.; Chen, Z.; Matsunoshita, H.; Maruyama, T.; Fukuyama, T.; Sasai, Y.; Inui, H.; Heilmaier, M.
2022. International Journal of Plasticity, 155, Art.-Nr. 103339. doi:10.1016/j.ijplas.2022.103339
Tempering of an additively manufactured microsegregated hot-work tool steel: A high-temperature synchrotron X-ray diffraction study
Fonseca, E. B.; Escobar, J. D.; Gabriel, A. H. G.; Ribamar, G. G.; Boll, T.; Lopes, É. S. N.
2022. Additive Manufacturing, 55, Art.Nr. 102812. doi:10.1016/j.addma.2022.102812
On the formation of nanocrystalline aluminides during high pressure torsion of Al/Ni alternating foils and post-processing multilayer reaction
Ivanisenko, Y.; Mazilkin, A.; Gallino, I.; Riegler, S. S.; Doyle, S.; Kilmametov, A.; Fabrichnaya, O.; Heilmaier, M.
2022. Journal of alloys and compounds, 905, Art. Nr.: 164201. doi:10.1016/j.jallcom.2022.164201
Role of atomic hydrogen supply on the onset of CO methanation over La–Ni based hydrogen storage alloys studied by in-situ approach
Sawahara, K.; Yatagai, K.; Boll, T.; Pundt, A.; Gemma, R.
2022. International Journal of Hydrogen Energy, 47 (44), 19051–19061. doi:10.1016/j.ijhydene.2022.04.089
On the complex intermetallics in an Al-Mn-Sc based alloy produced by laser powder bed fusion
Bayoumy, D.; Boll, T.; Schliephake, D.; Wu, X.; Zhu, Y.; Huang, A.
2022. Journal of alloys and compounds, 901, Art.Nr.: 163571. doi:10.1016/j.jallcom.2021.163571
Origin of non-uniform plasticity in a high-strength Al-Mn-Sc based alloy produced by laser powder bed fusion
Bayoumy, D.; Kwak, K.; Boll, T.; Dietrich, S.; Schliephake, D.; Huang, J.; Yi, J.; Takashima, K.; Wu, X.; Zhu, Y.; Huang, A.
2022. Journal of materials science & technology, 103, 121–133. doi:10.1016/j.jmst.2021.06.042
Chemical characterization of Mg0.25Mn0.75-H(D) nanocomposites by Atom Probe Tomography (APT)
Gemma, R.; Lu, Y.; Seils, S.; Boll, T.; Asano, K.
2022. Journal of alloys and compounds, 896, Article no: 163015. doi:10.1016/j.jallcom.2021.163015
On the impact of the mesostructure on the creep response of cellular NiAl-Mo eutectics
Wicht, D.; Kauffmann, A.; Schneider, M.; Heilmaier, M.; Böhlke, T.
2022. Acta materialia, 226, Art.-Nr. 117626. doi:10.1016/j.actamat.2022.117626
Mechanical behavior at elevated temperatures of an Al–Mn–Mg–Sc–Zr alloy manufactured by selective laser melting
Schliephake, D.; Bayoumy, D.; Seils, S.; Schulz, C.; Kauffmann, A.; Wu, X.; Huang, A. J.
2022. Materials science and engineering / A, 831, Art.-Nr.: 142032. doi:10.1016/j.msea.2021.142032
Formation and thermal stability of two-phase microstructures in Al-containing refractory compositionally complex alloys
Laube, S.; Kauffmann, A.; Schellert, S.; Seils, S.; Tirunilai, A. S.; Greiner, C.; Eggeler, Y. M.; Gorr, B.; Christ, H.-J.; Heilmaier, M.
2022. Science and Technology of Advanced Materials. doi:10.1080/14686996.2022.2132118
Dislocation-mediated and twinning-induced plasticity of CoCrFeMnNi in varying tribological loading scenarios
Dollmann, A.; Kauffmann, A.; Heilmaier, M.; Srinivasan Tirunilai, A.; Mantha, L. S.; Kübel, C.; Eder, S. J.; Schneider, J.; Greiner, C.
2022. Journal of Materials Science. doi:10.1007/s10853-022-07661-3
Phase continuity, brittle to ductile transition temperature and creep behavior of a eutectic Mo‐20Si‐52.8Ti alloy
Tirunilai, A. S.; Hinrichs, F.; Schliephake, D.; Engstler, M.; Mücklich, F.; Obert, S.; Winkens, G.; Kauffmann, A.; Heilmaier, M.
2022. Advanced Engineering Materials. doi:10.1002/adem.202200918
Texture Evolution During Hot Compression of CoCuFeMnNi Complex Concentrated Alloy Using Neutron Diffraction and Crystal Plasticity Simulations
Sonkusare, R.; Biswas, K.; Gan, W.; Brokmeier, H. G.; Gurao, N. P.
2022. Transactions of the Indian Institute of Metals. doi:10.1007/s12666-022-02689-0
Coarse‐Grained Refractory Composite Castables Based on Alumina and Niobium
Zienert, T.; Endler, D.; Hubálková, J.; Gehre, P.; Eusterholz, M.; Boll, T.; Heilmaier, M.; Günay, G.; Weidner, A.; Biermann, H.; Kraft, B.; Wagner, S.; Aneziris, C. G.
2022. Advanced Engineering Materials, 24 (8), Art.-Nr.: 2200296. doi:10.1002/adem.202200296
Simultaneous Twinning and Microband-Induced Plasticity of a Compositionally Complex Alloy with Interstitial Carbon at Cryogenic Temperatures
Tirunilai, A. S.; Osmundsen, R.; Baker, I.; Chen, H.; Weiss, K.-P.; Heilmaier, M.; Kauffmann, A.
2022. High Entropy Alloys & Materials. doi:10.1007/s44210-022-00001-9
In Situ Experiments: Paving Ways for Rapid Development of Structural Metallic Materials for a Sustainable Future
Sahu, V. K.; Sonkusare, R.; Biswas, K.; Gurao, N. P.
2022. Journal of the Indian Institute of Science. doi:10.1007/s41745-022-00292-2
High‐temperature ternary oxide phases in Ta/Nb‐Alumina composite materials
Eusterholz, M. K.; Boll, T.; Gebauer, J.; Weidner, A.; Kauffmann, A.; Franke, P.; Seifert, H.-J.; Biermann, H.; Aneziris, C.; Heilmaier, M.
2022. Advanced Engineering Materials, 24 (8), Art.-Nr.: 2200161. doi:10.1002/adem.202200161
Revealing the Role of Cross Slip for Serrated Plastic Deformation in Concentrated Solid Solutions at Cryogenic Temperatures
Tirunilai, A. S.; Weiss, K.-P.; Freudenberger, J.; Heilmaier, M.; Kauffmann, A.
2022. Metals, 12 (3), 514. doi:10.3390/met12030514
Correction to: The electronic states of ITO–MoS2: Experiment and theory
López‑Galán, O. A.; Ramos, M.; Nogan, J.; Ávila‑García, A.; Boll, T.; Heilmaier, M.
2022. MRS communications. doi:10.1557/s43579-022-00151-2
2021
Development of actual powder layer height depending on nominal layer thicknesses and selection of laser parameters
Jansen, D.; Hanemann, T.; Radek, M.; Rota, A.; Schröpfer, J.; Heilmaier, M.
2021. Journal of materials processing technology, 298, Art.-Nr.: 117305. doi:10.1016/j.jmatprotec.2021.117305
Microstructure and mechanical properties of high-Mn-ODS steels
Seils, S.; Kauffmann, A.; Delis, W.; Boll, T.; Heilmaier, M.
2021. Materials science and engineering / A, 825, Art.-Nr. 141859. doi:10.1016/j.msea.2021.141859
Oxidation mechanism of refractory high entropy alloys Ta-Mo-Cr-Ti-Al with varying Ta content
Schellert, S.; Gorr, B.; Laube, S.; Kauffmann, A.; Heilmaier, M.; Christ, H. J.
2021. Corrosion science, 192, Article no: 109861. doi:10.1016/j.corsci.2021.109861
Grain boundary engineering and its implications on corrosion behaviour of equiatomic CoCrFeMnNi high entropy alloy
Thota, H.; Jeyaraam, R.; Bairi, L. R.; Tirunilai, A. S.; Kauffmann, A.; Freudenberger, J.; Heilmaier, M.; Mandal, S.; Vadlamani, S. S.
2021. Journal of alloys and compounds, Art.-Nr.: 161500. doi:10.1016/j.jallcom.2021.161500
Quantitative Phase Prediction in Dual-Phase High-Entropy Alloys: Computationally Aided Parametric Approach
Singh Negi, A.; Sourav, A.; Heilmaier, M.; Biswas, S.; Thangaraju, S.
2021. Physica Status Solidi (B) Basic Research, 258 (6), Art. Nr.: 2100106. doi:10.1002/pssb.202100106
Microcantilever Fracture Tests on Eutectic NiAl‐Cr(Mo) in‐situ Composites
Gabel, S.; Giese, S.; Merle, B.; Sprenger, I.; Heilmaier, M.; Neumeier, S.; Bitzek, E.; Göken, M.
2021. Advanced engineering materials, 23 (6), Art.-Nr. 202001464. doi:10.1002/adem.202001464
Soft sensor approach based on magnetic Barkhausen noise by means of the forming process punch-hole-rolling
Mühl, F.; Knoll, M.; Khabou, M.; Dietrich, S.; Groche, P.; Schulze, V.
2021. Advances in industrial and manufacturing engineering, 2, Art.-Nr. 100039. doi:10.1016/j.aime.2021.100039
Oxidation Resistance, Creep Strength and Room-Temperature Fracture Toughness of Mo–28Ti–14Si–6C–6B Alloy
Hatakeyama, T.; Kauffmann, A.; Obert, S.; Gombola, C.; Heilmaier, M.; Yoshimi, K.
2021. Materialia, 101108. doi:10.1016/j.mtla.2021.101108
Microstructure, mechanical behaviour and strengthening mechanisms in Hastelloy X manufactured by electron beam and laser beam powder bed fusion
Karapuzha, A. S.; Fraser, D.; Schliephake, D.; Dietrich, S.; Zhu, Y.; Wu, X.; Huang, A.
2021. Journal of alloys and compounds, 862, Art.-Nr.: 158034. doi:10.1016/j.jallcom.2020.158034
High entropy alloy nanocomposites produced by high pressure torsion
Taheriniya, S.; Davani, F. A.; Hilke, S.; Hepp, M.; Gadelmeier, C.; Chellali, M. R.; Boll, T.; Rösner, H.; Peterlechner, M.; Gammer, C.; Divinski, S. V.; Butz, B.; Glatzel, U.; Hahn, H.; Wilde, G.
2021. Acta Materialia, 208, Art.-Nr.: 116714. doi:10.1016/j.actamat.2021.116714
Mo-Silicide Alloys for High-Temperature Structural Applications
Perepezko, J. H.; Krüger, M.; Heilmaier, M.
2021. Materials Performance and Characterization, 10 (2), Article: 20200183. doi:10.1520/MPC20200183
Vertical continuous compound casting of copper aluminum bilayer rods
Greß, T.; Glück Nardi, V.; Schmid, S.; Hoyer, J.; Rizaiev, Y.; Boll, T.; Seils, S.; Tonn, B.; Volk, W.
2021. Journal of materials processing technology, 288, Art.-Nr.: 116854. doi:10.1016/j.jmatprotec.2020.116854
Characterization of the Microstructure After Composite Peening of Aluminum
Seitz, M.; Dürrschnabel, M.; Kauffmann, A.; Kurpiers, C.; Greiner, C.; Weidenmann, K. A.
2021. Advanced engineering materials, 23 (2), Art.Nr. 2000575. doi:10.1002/adem.202000575
Flexible Powder Production for Additive Manufacturing of Refractory Metal-Based Alloys
Hinrichs, F.; Kauffmann, A.; Schliephake, D.; Seils, S.; Obert, S.; Ratschbacher, K.; Allen, M.; Pundt, A.; Heilmaier, M.
2021. Metals, 11 (11), Article no: 1723. doi:10.3390/met11111723
Microstructure tailoring of Al-containing compositionally complex alloys by controlling the sequence of precipitation and ordering
Laube, S.; Schellert, S.; Srinivasan Tirunilai, A.; Schliephake, D.; Gorr, B.; Christ, H.-J.; Kauffmann, A.; Heilmaier, M.
2021. Acta Materialia, 218, Article no: 117217. doi:10.1016/j.actamat.2021.117217
Influence of Cold Rotary Swaging on Microstructure and Uniaxial Mechanical Behavior in Alloy 718
Klumpp, A.; Kauffmann, A.; Seils, S.; Dietrich, S.; Schulze, V.
2021. Metallurgical and materials transactions / A, 52, 4331–4341. doi:10.1007/s11661-021-06371-w
Micro-mechanical deformation behavior of CoCrFeMnNi high-entropy alloy
Lu, K.; Chauhan, A.; Litvinov, D.; Tirunilai, A. S.; Freudenberger, J.; Kauffmann, A.; Heilmaier, M.; Aktaa, J.
2021. Journal of materials science & technology. doi:10.1016/j.jmst.2021.04.079
The Effect of Al on the Formation of a CrTaO₄ Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl
Schellert, S.; Gorr, B.; Christ, H.-J.; Pritzel, C.; Laube, S.; Kauffmann, A.; Heilmaier, M.
2021. Oxidation of metals, 96, 333–345. doi:10.1007/s11085-021-10046-7
Deformation mechanisms of CoCrFeMnNi high-entropy alloy under low-cycle-fatigue loading
Lu, K.; Chauhan, A.; Tirunilai, A. S.; Freudenberger, J.; Kauffmann, A.; Heilmaier, M.; Aktaa, J.
2021. Acta materialia, 215, Art.-Nr.: 117089. doi:10.1016/j.actamat.2021.117089
On aliovalent cations control of α-alumina growth on doped and undoped NiAl
Boll, T.; Babic, V.; Panas, I.; Bäcke, O.; Stiller, K.
2021. Acta Materialia, 210, Art.-Nr.: 116809. doi:10.1016/j.actamat.2021.116809
The High-Solution Design of Magnesium Alloys
Wang, J.; Yuan, Y.; Cheng, X.; Chen, T.; Jiang, B.; Li, D.; Tang, A.; Boll, T.; Pan, F.
2021. Magnesium Technology 2021. Ed.: V. M. Miller, 27–31, Springer. doi:10.1007/978-3-030-65528-0_5
Temperature Resistance of Mo3Si: Phase Stability, Microhardness, and Creep Properties
Kauss, O.; Obert, S.; Bogomol, I.; Wablat, T.; Siemensmeyer, N.; Naumenko, K.; Krüger, M.
2021. Metals, 11 (4), Article no: 564. doi:10.3390/met11040564
Influence of carbon on the mechanical behavior and microstructure evolution of CoCrFeMnNi processed by high pressure torsion
Lu, Y.; Mazilkin, A.; Boll, T.; Stepanov, N.; Zherebtzov, S.; Salishchev, G.; Ódor, É.; Ungar, T.; Lavernia, E.; Hahn, H.; Ivanisenko, Y.
2021. Materialia, 16, Art.-Nr.: 101059. doi:10.1016/j.mtla.2021.101059
Current Status of Research on the Oxidation Behavior of Refractory High Entropy Alloys
Gorr, B.; Schellert, S.; Müller, F.; Christ, H.-J.; Kauffmann, A.; Heilmaier, M.
2021. Advanced engineering materials, 23 (5), Art.-Nr.: 2001047. doi:10.1002/adem.202001047
Influence of Temperature and Plastic Strain on Deformation Mechanisms and Kink Band Formation in Homogenized HfNbTaTiZr
Chen, H.; Hanemann, T.; Seils, S.; Schliephake, D.; Tirunilai, A. S.; Heilmaier, M.; Weiss, K.-P.; Kauffmann, A.
2021. Crystals, 11 (2), 81. doi:10.3390/cryst11020081
The Creep and Oxidation Behaviour of Pesting-Resistant -Containing Eutectic-Eutectoid Mo-Si-Ti Alloys
Obert, S.; Kauffmann, A.; Pretzler, R.; Schliephake, D.; Hinrichs, F.; Heilmaier, M.
2021. Metals, 11 (1), Art.-Nr.: 169. doi:10.3390/met11010169
Superior low-cycle fatigue properties of CoCrNi compared to CoCrFeMnNi
Lu, K.; Chauhan, A.; Walter, M.; Tirunilai, A. S.; Schneider, M.; Laplanche, G.; Freudenberger, J.; Kauffmann, A.; Heilmaier, M.; Aktaa, J.
2021. Scripta materialia, 194, Art.-Nr.: 113667. doi:10.1016/j.scriptamat.2020.113667
Microstructural and Chemical Constitution of the Oxide Scale formed on a Pesting-Resistant Mo-Si-Ti Alloy
Obert, S.; Kauffmann, A.; Seils, S.; Boll, T.; Kauffmann-Weiss, S.; Chen, H.; Anton, R.; Heilmaier, M.
2021. Corrosion science, 178, Art.-Nr. 109081. doi:10.1016/j.corsci.2020.109081
High temperature strength retention of Cu/Nb nanolaminates through dynamic strain ageing
Liu, Z.; Snel, J.; Boll, T.; Wang, J. Y.; Monclús, M. A.; Molina-Aldareguía, J. M.; LLorca, J.
2021. Materials science and engineering / A, 799, Article no: 140117. doi:10.1016/j.msea.2020.140117
2020
Dimensionless Enthalpy as Characteristic Factor for Process Control in Laser Powder Bed Fusion
Hanemann, T.; Seyfert, C.; Holfelder, P.; Rota, A.; Heilmaier, M.
2020. Journal of Laser Micro/Nanoengineering, 15 (3), 257–266. doi:10.2961/jlmn.2020.03.2017
Oxidation behaviour of NiAl intermetallics with embedded Cr and Mo
Geramifard, G.; Gombola, C.; Franke, P.; Seifert, H. J.
2020. Corrosion science, 177, Art. Nr.: 108956. doi:10.1016/j.corsci.2020.108956
Origins of strength and plasticity in the precious metal based High-Entropy Alloy AuCuNiPdPt
Thiel, F.; Geissler, D.; Nielsch, K.; Kauffmann, A.; Seils, S.; Heilmaier, M.; Utt, D.; Albe, K.; Motylenko, M.; Rafaja, D.; Freudenberger, J.
2020. Acta materialia, 185, 400–411. doi:10.1016/j.actamat.2019.12.020
Intensive processing optimization for achieving strong and ductile Al-Mn-Mg-Sc-Zr alloy produced by selective laser melting
Bayoumy, D.; Schliephake, D.; Dietrich, S.; Wu, X. H.; Zhu, Y. M.; Huang, A. J.
2020. Materials and design, 198, Art.Nr. 109317. doi:10.1016/j.matdes.2020.109317
Formation of complex intermetallic phases in novel refractory high-entropy alloys NbMoCrTiAl and TaMoCrTiAl: Thermodynamic assessment and experimental validation
Müller, F.; Gorr, B.; Christ, H.-J.; Chen, H.; Kauffmann, A.; Laube, S.; Heilmaier, M.
2020. Journal of alloys and compounds, 842, Article no: 155726. doi:10.1016/j.jallcom.2020.155726
Dislocation-based Serrated Plastic Flow of High Entropy Alloys at Cryogenic Temperatures
Tirunilai, A. S.; Hanemann, T.; Weiss, K.-P.; Freudenberger, J.; Heilmaier, M.; Kauffmann, A.
2020. Acta materialia, 200, 980–991. doi:10.1016/j.actamat.2020.09.052
A zone melting device for the in situ observation of directional solidification using high-energy synchrotron x rays editors-pick
Gombola, C.; Hasemann, G.; Kauffmann, A.; Sprenger, I.; Laube, S.; Schmitt, A.; Gang, F.; Bolbut, V.; Oehring, M.; Blankenburg, M.; Schell, N.; Staron, P.; Pyczak, F.; Krüger, M.; Heilmaier, M.
2020. Review of scientific instruments, 91 (9), Art.Nr. 093901. doi:10.1063/5.0019020
Effect of Y Additions on the Oxidation Behaviour of Novel Refractory High-Entropy Alloy NbMoCrTiAl at 1000 °C in Air
Müller, F.; Gorr, B.; Christ, H.-J.; Chen, H.; Kauffmann, A.; Heilmaier, M.
2020. Oxidation of metals, 94 (1-2), 147–163. doi:10.1007/s11085-020-09983-6
High-temperature low cycle fatigue behavior of an equiatomic CoCrFeMnNi high-entropy alloy
Lu, K.; Chauhan, A.; Litvinov, D.; Walter, M.; Tirunilai, A. S.; Freudenberger, J.; Kauffmann, A.; Heilmaier, M.; Aktaa, J.
2020. Materials science and engineering / A, 791, Article: 139781. doi:10.1016/j.msea.2020.139781
Creep of an oxidation resistant coated Mo-9Si-8B alloy
Gombola, C.; Schliephake, D.; Heilmaier, M.; Perepezko, J. H.
2020. Intermetallics, 120, 106743. doi:10.1016/j.intermet.2020.106743
Breakdown of Varvenne scaling in (AuNiPdPt) Cu high-entropy alloys
Thiel, F.; Utt, D.; Kauffmann, A.; Nielsch, K.; Albe, K.; Heilmaier, M.; Freudenberger, J.
2020. Scripta materialia, 181, 15–18. doi:10.1016/j.scriptamat.2020.02.007
Temperature dependent strengthening contributions in austenitic and ferritic ODS steels
Seils, S.; Kauffmann, A.; Hinrichs, F.; Schliephake, D.; Boll, T.; Heilmaier, M.
2020. Materials science and engineering / A, 786, Article: 139452. doi:10.1016/j.msea.2020.139452
Solid solution strengthening and deformation behavior of single-phase Cu-base alloys under tribological load
Laube, S.; Kauffmann, A.; Ruebeling, F.; Freudenberger, J.; Heilmaier, M.; Greiner, C.
2020. Acta materialia, 185, 300–308. doi:10.1016/j.actamat.2019.12.005
Characterisation of the oxidation and creep behaviour of novel Mo-Si-Ti alloys
Obert, S.; Kauffmann, A.; Heilmaier, M.
2020. Acta materialia, 184, 132–142. doi:10.1016/j.actamat.2019.11.045
Microstructural properties and peritectic reactions in a binary Co–Sn alloy by means of scanning electron microscopy and atom probe tomography
Khushaim, M.; Alahmari, F.; Kattan, N.; Chassaing, D.; Boll, T.
2020. Materials Research Express, 7 (8), Art.Nr. 086508. doi:10.1088/2053-1591/abad04
Microstructural Investigations of Novel High Temperature Alloys Based on NiAl-(Cr,Mo)
Gombola, C.; Kauffmann, A.; Geramifard, G.; Blankenburg, M.; Heilmaier, M.
2020. Metals, 10 (7), Art. Nr.: 961. doi:10.3390/met10070961
On the chemical and microstructural requirements for the pesting-resistance of Mo-Si-Ti alloys
Obert, S.; Kauffmann, A.; Seils, S.; Schellert, S.; Weber, M.; Gorr, B.; Christ, H.-J.; Heilmaier, M.
2020. Journal of materials research and technology, 9 (4), 8556–8567. doi:10.1016/j.jmrt.2020.06.002
Microstructural changes in CoCrFeMnNi under mild tribological load
Dollmann, A.; Kauffmann, A.; Heilmaier, M.; Haug, C.; Greiner, C.
2020. Journal of materials science, 55 (26), 12353–12372. doi:10.1007/s10853-020-04806-0
Effect of Water Vapor on the Oxidation Behavior of the Eutectic High‐Temperature Alloy Mo‐20Si‐52.8Ti
Weber, M.; Gorr, B.; Christ, H.-J.; Obert, S.; Kauffmann, A.; Heilmaier, M.
2020. Advanced engineering materials, 22 (7), Art. Nr.: 2000219. doi:10.1002/adem.202000219
Magnetron sputtered silicon coatings as oxidation protection for Mo‐based alloys
Anton, R.; Laska, N.; Schulz, U.; Obert, S.; Heilmaier, M.
2020. Advanced engineering materials, 22 (7), Article Nr.: 2000218. doi:10.1002/adem.202000218
Comparison of cryogenic deformation of the concentrated solid solutions CoCrFeMnNi, CoCrNi and CoNi
Tirunilai, A. S.; Hanemann, T.; Reinhart, C.; Tschan, V.; Weiss, K.-P.; Laplanche, G.; Freudenberger, J.; Heilmaier, M.; Kauffmann, A.
2020. Materials science and engineering / A, 783, Art. Nr.: 139290. doi:10.1016/j.msea.2020.139290
A new strategy to intrinsically protect refractory metal based alloys at ultra high temperatures
Gorr, B.; Müller, F.; Schellert, S.; Christ, H.-J.; Chen, H.; Kauffmann, A.; Heilmaier, M.
2020. Corrosion science, 166, Art. Nr.: 108475. doi:10.1016/j.corsci.2020.108475
Controlling crystallographic ordering in Mo–Cr–Ti–Al high entropy alloys to enhance ductility
Laube, S.; Chen, H.; Kauffmann, A.; Schellert, S.; Müller, F.; Gorr, B.; Müller, J.; Butz, B.; Christ, H.-J.; Heilmaier, M.
2020. Journal of alloys and compounds, 823, Article No.153805. doi:10.1016/j.jallcom.2020.153805
2019
Crystallographic ordering in a series of Al-containing refractory high entropy alloys Ta-Nb-Mo-Cr-Ti-Al
Chen, H.; Kauffmann, A.; Seils, S.; Boll, T.; Liebscher, C. H.; Harding, I.; Kumar, K. S.; Szabo, D. V.; Schlabach, S.; Kauffmann-Weiss, S.; Müller, F.; Gorr, B.; Christ, H.-J.; Heilmaier, M.
2019. Acta materialia, 176, 123–133. doi:10.1016/j.actamat.2019.07.001
On the oxidation mechanism of refractory high entropy alloys
Müller, F.; Gorr, B.; Christ, H.-J.; Müller, J.; Butz, B.; Chen, H.; Kauffmann, A.; Heilmaier, M.
2019. Corrosion science, 159, Article: 108161. doi:10.1016/j.corsci.2019.108161
Influence of SiC/Silica and Carbon/Silica Interfaces on the High‐Temperature Creep of Silicon Oxycarbide‐Based Glass Ceramics : A Case Study
Stabler, C.; Schliephake, D.; Heilmaier, M.; Rouxel, T.; Kleebe, H.-J.; Narisawa, M.; Riedel, R.; Ionescu, E.
2019. Advanced engineering materials, 21 (6), Art. Nr.: 1800596. doi:10.1002/adem.201800596
Microstructural evolution during creep of lamellar eutectoid and off-eutectoid FeAl/FeAl2 alloys
Schmitt, A.; Kumar, K. S.; Kauffmann, A.; Heilmaier, M.
2019. Intermetallics, 107, 116–125. doi:10.1016/j.intermet.2019.01.015
Aluminide Coatings on Mo-Si-B-Ti-Fe Alloy
Walsh, Z.; Kasnakjian, S.; Gallegos, L.; Patil, D.; Ravi, V.; Shliephake, D.; Heilmaier, M.
2019. International Corrosion Conference series, March, Art.-Nr. 13501
Precipitation behaviour and mechanical properties of a novel AlMoTaTi complex concentrated alloy
Schliephake, D.; Medvedev, A. E.; Imran, M. K.; Obert, S.; Fabijanic, D.; Heilmaier, M.; Molotnikov, A.; Wu, X.
2019. Scripta materialia, 173, 16–20. doi:10.1016/j.scriptamat.2019.07.033
Constitution, oxidation and creep of eutectic and eutectoid Mo-Si-Ti alloys
Schliephake, D.; Kauffmann, A.; Cong, X.; Gombola, C.; Azim, M.; Gorr, B.; Christ, H.-J.; Heilmaier, M.
2019. Intermetallics, 104, 133–142. doi:10.1016/j.intermet.2018.10.028
High-pressure torsion driven mechanical alloying of CoCrFeMnNi high entropy alloy
Kilmametov, A.; Kulagin, R.; Mazilkin, A.; Seils, S.; Boll, T.; Heilmaier, M.; Hahn, H.
2019. Scripta materialia, 158, 29–33. doi:10.1016/j.scriptamat.2018.08.031
2018
Contribution of Lattice Distortion to Solid Solution Strengthening in a Series of Refractory High Entropy Alloys
Chen, H.; Kauffmann, A.; Laube, S.; Choi, I.-C.; Schwaiger, R.; Huang, Y.; Lichtenberg, K.; Müller, F.; Gorr, B.; Christ, H.-J.; Heilmaier, M.
2018. Metallurgical and materials transactions / A, 49 (3), 772–781. doi:10.1007/s11661-017-4386-1
Phase Evolution in and Creep Properties of Nb-Rich Nb-Si-Cr Eutectics
Gang, F.; Kauffmann, A.; Heilmaier, M.
2018. Metallurgical and materials transactions / A, 49 (3), 763–771. doi:10.1007/s11661-017-4367-4
Optical and Electrical Investigation of High-Current Arcing Modes and Correlation with Contact Microstructure after Single Current Interruption
Feilbach, A.; Hinrichsen, V.; Hauf, U.; Heilmaier, M.; Boening, M.; Müller, F. E. H.
2018. Proceedings of the 28th International Symposium on Discharges and Electrical Insulation in Vacuum: Greifswald, Germany, 23rd-28th September 2018. Volume 2., 169–172, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/DEIV.2018.8537042
Development of Oxidation Resistant Refractory High Entropy Alloys for High Temperature Applications: Recent Results and Development Strategy
Gorr, B.; Mueller, F.; Christ, H.-J.; Chen, H.; Kauffmann, A.; Schweiger, R.; Szabo, D. V.; Heilmaier, M.
2018. TMS 2018. 147th Annual Meeting & Exhibition Supplemental Proceedings (TMS), 647–659, Springer. doi:10.1007/978-3-319-72526-0_61
Peculiarities of deformation of CoCrFeMnNi at cryogenic temperatures
Tirunilai, A. S.; Sas, J.; Weiss, K.-P.; Chen, H.; Szabo, D. V.; Schlabach, S.; Haas, S.; Geissler, D.; Freudenberger, J.; Heilmaier, M.; Kauffmann, A.
2018. Journal of materials research, 1–14. doi:10.1557/jmr.2018.252
Influence of work-hardening on fatigue crack growth, effective threshold and crack opening behavior in the nickel-based superalloy Inconel 718
Klumpp, A.; Maier, S.; Chen, H.; Fotouhi, M.; Schneider, R.; Dietrich, S.; Lang, K.-H.; Schulze, V.
2018. International journal of fatigue, 116, 257–267. doi:10.1016/j.ijfatigue.2018.06.033
2017
Tensile creep of miniaturized specimens
Luan, L.; Riesch-Oppermann, H.; Heilmaier, M.
2017. Journal of materials research, 32 (24), 4563–4572. doi:10.1557/jmr.2017.414
Microstructure Formation and Resistivity Change in CuCr during Rapid Solidification
Hauf, U.; Kauffmann, A.; Kauffmann-Weiss, S.; Feilbach, A.; Boening, M.; Mueller, F. E. H.; Hinrichsen, V.; Heilmaier, M.
2017. Metals, 7 (11), Art.Nr. 478. doi:10.3390/met7110478
Creep of binary Fe-Al alloys with ultrafine lamellar microstructures
Schmitt, A.; Kumar, S. K.; Kauffmann, A.; Li, X.; Stein, F.; Heilmaier, M.
2017. Intermetallics, 90, 180–187. doi:10.1016/j.intermet.2017.07.016
The effect of the ternary elements B, Ti, Cr, Cu, and Mo on fully lamellar FeAl + FeAl2 alloys
Li, X.; Schmitt, A.; Heilmaier, M.; Stein, F.
2017. Journal of alloys and compounds, 722, 219–228. doi:10.1016/j.jallcom.2017.06.106
Combinatorial exploration of the high entropy alloy system Co-Cr-Fe-Mn-Ni
Kauffmann, A.; Stüber, M.; Leiste, H.; Ulrich, S.; Schlabach, S.; Szabo, D. V.; Seils, S.; Gorr, B.; Chen, H.; Seifert, H.-J.; Heilmaier, M.
2017. Surface and coatings technology, 325, 174–180. doi:10.1016/j.surfcoat.2017.06.041
Optimisation of selective laser melting parameters for the Ni-based superalloy IN-738 LC using Doehlert’s design
Perevoshchikova, N.; Rigaud, J.; Sha, Y.; Heilmaier, M.; Finnin, B.; Labelle, E.; Wu, X.
2017. Rapid prototyping journal, 23 (5), 881–892. doi:10.1108/RPJ-04-2016-0063
Effect of Ti addition on the thermal expansion anisotropy of Mo₅Si₃
Azim, M. A.; Christ, H.-J.; Gorr, B.; Kowald, T.; Lenchuk, O.; Albe, K.; Heilmaier, M.
2017. Acta materialia, 132, 25–34. doi:10.1016/j.actamat.2017.02.066
High-Resolution Studies on Nanoscaled Ni/YSZ Anodes
Szász, J.; Seils, S.; Klotz, D.; Störmer, H.; Heilmaier, M.; Gerthsen, D.; Yokokawa, H.; Ivers-Tiffée, E.
2017. Chemistry of materials, 29 (12), 5113–5123. doi:10.1021/acs.chemmater.7b00360
Coarsening kinetics of lamellar microstructures : Experiments and simulations on a fully-lamellar Fe-Al in situ composite
Li, X.; Bottler, F.; Spatschek, R.; Schmitt, A.; Heilmaier, M.; Stein, F.
2017. Acta materialia, 127, 230–243. doi:10.1016/j.actamat.2017.01.041
Phase-field simulation of the microstructure evolution in the eutectic NiAl-34Cr system
Kellner, M.; Sprenger, I.; Steinmetz, P.; Hötzer, J.; Nestler, B.; Heilmaier, M.
2017. Computational materials science, 128, 379–387. doi:10.1016/j.commatsci.2016.11.049
Interdependency of test environment and current breaking capacity of a model vacuum switch
Feilbach, A.; Menne, H.; Hinrichsen, V.; Hauf, U.; Heilmaier, M.; Böning, M.; Müller, F. E. H.
2017. Proceedings of the 63rd IEEE Holm Conference on Electrical Contacts, Denver, Colorado, USA, 10th - 13th September 2017, 258–263, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/HOLM.2017.8088097
Effect of microalloying with silicon on high temperature oxidation resistance of novel refractory high-entropy alloy Ta-Mo-Cr-Ti-Al
Müller, F.; Gorr, B.; Christ, H.-J.; Chen, H.; Kauffmann, A.; Heilmaier, M.
2017. Materials at high temperatures, 35 (1-3), 168–176. doi:10.1080/09603409.2017.1389115
Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti)5Si3
Azim, M. A.; Gorr, B.; Christ, H.-J.; Lenchuk, O.; Albe, K.; Schliephake, D.; Heilmaier, M.
2017. Intermetallics, 90, 103–112. doi:10.1016/j.intermet.2017.05.023
Characterization of Oxidation Kinetics of Mo-Si-B-Based Materials
Azim, M. A.; Gorr, B.; Christ, H.-J.; Heilmaier, M.; Koch, U.; Engelhard, M.
2017. Oxidation of metals, 87 (1-2), 89–108. doi:10.1007/s11085-016-9659-3
Face Centred Cubic Multi-Component Equiatomic Solid Solutions in the Au-Cu-Ni-Pd-Pt System
Freudenberger, J.; Rafaja, D.; Geissler, D.; Giebeler, L.; Ullrich, C.; Kauffmann, A.; Heilmaier, M.; Nielsch, K.
2017. Metals, 7 (4), Art. Nr.: 135. doi:10.3390/met7040135
Enhanced Oxidation Resistance of Mo-Si-B-Ti Alloys by Pack Cementation
Schliephake, D.; Gombola, C.; Kauffmann, A.; Heilmaier, M.; Perepezko, J. H.
2017. Oxidation of metals, 88 (SI, 3-4), 267–277. doi:10.1007/s11085-017-9730-8
High-Temperature Oxidation Behavior of Refractory High-Entropy Alloys : Effect of Alloy Composition
Gorr, B.; Müller, F.; Azim, M.; Christ, H.-J.; Müller, T.; Chen, H.; Kauffmann, A.; Heilmaier, M.
2017. Oxidation of metals, 88 (3-4), 339–349. doi:10.1007/s11085-016-9696-y
2016
Nanostructure evolution in ODS steels under ion irradiation
Rogozhkin, S.; Bogachev, A.; Korchuganova, O.; Nikitin, A.; Orlov, N.; Aleev, A.; Zaluzhnyi, A.; Kozodaev, M.; Kulevoy, T.; Chalykh, B.; Lindau, R.; Hoffmann, J.; Möslang, A.; Vladimirov, P.; Klimenkov, M.; Heilmaier, M.; Wagner, J.; Seils, S.
2016. Nuclear materials and energy, 9, 66–74. doi:10.1016/j.nme.2016.06.011
High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon
Stabler, C.; Roth, F.; Narisawa, M.; Schliephake, D.; Heilmaier, M.; Lauterbach, S.; Kleebe, H.-J.; Riedel, R.; Ionescu, E.
2016. Journal of the European Ceramic Society, 36 (15), 3747–3753. doi:10.1016/j.jeurceramsoc.2016.04.015
Validation of the applicability of a creep model for directionally solidified eutectics with a lamellar microstructure
Albiez, J.; Sprenger, I.; Weygand, D.; Heilmaier, M.; Böhlke, T.
2016. Proceedings in applied mathematics and mechanics, 16 (1), 297–298. doi:10.1002/pamm.201610137
Al-Ti Particulate Composite : Processing and Studies on Particle Twinning, Microstructure, and Thermal Stability
Yadav, D.; Bauri, R.; Kauffmann, A.; Freudenberger, J.
2016. Metallurgical and materials transactions / A, 47 (8), Art.Nr. 4226–4238. doi:10.1007/s11661-016-3597-1
Influence of post heat treatments on anisotropy of mechanical behaviour and microstructure of Hastelloy-X parts produced by selective laser melting
Tomus, D.; Tian, Y.; Rometsch, P. A.; Heilmaier, M.; Wu, X.
2016. Materials science and engineering / A, 667, 42–53. doi:10.1016/j.msea.2016.04.086
Physically motivated model for creep of directionally solidified eutectics evaluated for the intermetallic NiAl-9Mo
Albiez, J.; Sprenger, I.; Seemüller, C.; Weygand, D.; Heilmaier, M.; Böhlke, T.
2016. Acta materialia, 110, 377–385. doi:10.1016/j.actamat.2016.02.024
Microstructure and mechanical properties at elevated temperatures of a new Al-containing refractory high-entropy alloy Nb-Mo-Cr-Ti-Al
Chen, H.; Kauffmann, A.; Gorr, B.; Schliephake, D.; Seemüller, C.; Wagner, J. N.; Christ, H.-J.; Heilmaier, M.
2016. Journal of alloys and compounds, 661, 206–215. doi:10.1016/j.jallcom.2015.11.050
Effect of strain-rate on the deformation response of D0₃-ordered Fe₃Al
Janda, D.; Ghassemi-Armaki, H.; Bruder, E.; Hockauf, M.; Heilmaier, M.; Kumar, K. S.
2016. Acta materialia, 103, 909–918. doi:10.1016/j.actamat.2015.11.002
Thermal stability of electrical and mechanical properties of cryo-drawn Cu and CuZr wires
Kauffmann, A.; Geissler, D.; Freudenberger, J.
2016. Materials Science and Engineering: A, 651, 567–573. doi:10.1016/j.msea.2015.10.119
MIM for HT turbine parts : Gas-atomized versus mechanically milled Nb-si alloy powder
Mulser, M.; Hartwig, T.; Seemüller, C.; Heilmaier, M.; Adkins, N.; Wickins, M.
2016. World Powder Metallurgy 2016 Congress and Exhibition, Hamburg, Germany, 9th - 13th October 2016, European Powder Metallurgy Association (EPMA)
Investigation of current breaking capacity of vacuum interrupters with focus on contact material properties with the help of a reference model vacuum circuit breaker
Feilbach, A.; Hauf, U.; Böning, M.; Hinrichsen, V.; Heilmaier, M.; Müller, F. E. H.
2016. 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), Suzhou, China, 18–23 September 2016. Ed.: R. Boxman, 1–4, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/DEIV.2016.7748691
The Al-Rich Part of the Fe-Al Phase Diagram
Li, X.; Scherf, A.; Heilmaier, M.; Stein, F.
2016. Journal of phase equilibria and diffusion, 37 (2), 162–173. doi:10.1007/s11669-015-0446-7
Investigation of the heat affected volume of CuCr contact material for vacuum interrupters
Hauf, U.; Feilbach, A.; Böning, M.; Heilmaier, M.; Hinrichsen, V.; Müller, F. E. H.
2016. 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), Suzhou, China, 18-23 Sept. 2016, 1–4, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/DEIV.2016.7748695
Synthesis and high-temperature creep behavior of a SiLuOC-based glass-ceramic
Stabler, C.; Seemüller, C.; Choudhary, A.; Heilmaier, M.; Lauterbach, S.; Kleebe, H.-J.; Ionescu, E.
2016. Journal of the Ceramic Society of Japan, 124 (10), 1006–1012. doi:10.2109/jcersj2.16101
Microstructure Variations and Creep Properties of Novel High Temperature V-Si-B Materials
Krüger, M.; Bolbut, V.; Gang, F.; Hasemann, G.
2016. JOM, 68 (11), 2811–2816. doi:10.1007/s11837-016-2096-6
High temperature oxidation behavior of an equimolar refractory metal-based alloy 20Nb-20Mo-20Cr-20Ti-20Al with and without Si addition
Gorr, B.; Mueller, F.; Christ, H.-J.; Mueller, T.; Chen, H.; Kauffmann, A.; Heilmaier, M.
2016. Journal of alloys and compounds, 688, Part B, 468–477. doi:10.1016/j.jallcom.2016.07.219
Orientation relationship of eutectoid FeAl and FeAl₂
Scherf, A.; Kauffmann, A.; Kauffmann-Weiss, S.; Scherer, T.; Li, X.; Stein, F.; Heilmaier, M.
2016. Journal of applied crystallography, 49 (2), 442–449. doi:10.1107/S1600576716000911
In Situ Study of the Influence of Nickel on the Phase Transformation Kinetics in Austempered Ductile Iron
Saal, P.; Meier, L.; Li, X.; Hofmann, M.; Hoelzel, M.; Wagner, J. N.; Volk, W.
2016. Metallurgical and materials transactions / A, 47 (2), 661–671. doi:10.1007/s11661-015-3261-1
In-situ neutron diffraction during biaxial deformation
Van Petegem, S.; Wagner, J.; Panzner, T.; Upadhyay, M. V.; Trang, T. T. T.; Van Swygenhoven, H.
2016. Acta Materialia, 105, 404–416. doi:10.1016/j.actamat.2015.12.015
Microstructure Evolution in a New Refractory High-Entropy Alloy W-Mo-Cr-Ti-Al
Gorr, B.; Azim, M.; Christ, H.-J.; Chen, H.; Szabo, D. V.; Kauffmann, A.; Heilmaier, M.
2016. Metallurgical and Materials Transactions A, 47, 961–970. doi:10.1007/s11661-015-3246-0
2015
One-dimensional simulation of the creep behavior of directionally solidified NiAl-9Mo
Albiez, J.; Sprenger, I.; Heilmaier, M.; Böhlke, T.
2015. Proceedings in applied mathematics and mechanics, 15 (1), 269–270. doi:10.1002/pamm.201510125
Oxidation behavior of pack-cemented Si-B oxidation protection coatings for Mo-Si-B alloys at 1300°C
Lange, A.; Heilmaier, M.; Sossamann, T. A.; Perepezko, J. H.
2015. Surface and coatings technology, 266, 57–63. doi:10.1016/j.surfcoat.2015.02.015
Early cluster formation during rapid cooling of an Al-Cu-Mg alloy: In situ small-angle X-ray scattering
Schloth, P.; Menzel, A.; Fife, J. L.; Wagner, J. N.; Van Swygenhoven, H.; J.-M. Drezet
2015. Scripta materialia, 108, 56–59. doi:10.1016/j.scriptamat.2015.06.015
An APT investigation of an amorphous Cr-B-C thin film
Boll, T.; Thuvander, M.; Koch, S.; Wagner, J. N.; Nedfors, N.; Jansson, U.; Stiller, K.
2015. Ultramicroscopy, 159 (2), 217–222. doi:10.1016/j.ultramic.2015.01.001
Microstructure and Phase Transformation Temperatures of Two-Phase FeAl (B2) + FeAl2 Alloys
Li, X.; Palm, M.; Scherf, A.; Janda, D.; Heilmaier, M.; Stein, F.
2015. Advanced structural and functional intermetallic-based alloys : November 30 - December 5, 2014, Boston, Massachusetts, USA ; [Symposium YY: Advanced Structural and Functional Intermetallic-Based Alloys ; held at the 2014 MRS fall meeting] . Ed.: I. Baker, 55–60, Materials Research Society. doi:10.1557/opl.2014.965
Mechanisms of oxide scale formation on yttrium-alloyed Mo-Si-B containing fine-grained microstructure
Majumdar, S.; Dönges, B.; Gorr, B.; Christ, H.-J.; Schliephake, D.; Heilmaier, M.
2015. Corrosion science, 90, 76–88. doi:10.1016/j.corsci.2014.09.017
Phase equilibria, microstructure, and high temperature oxidation resistance of novel refractory high-entropy alloys
Gorr, B.; Azim, M.; Christ, H.-J.; Mueller, T.; Schliephake, D.; Heilmaier, M.
2015. Journal of alloys and compounds, 624, 270–278. doi:10.1016/j.jallcom.2014.11.012
The influence of microstructural features on the electrical conductivity of solid phase sintered CuCr composites
Klinski-Wetzel, K. von; Kowanda, C.; Heilmaier, M.; Mueller, F. E. H.
2015. Journal of alloys and compounds, 631, 237–247. doi:10.1016/j.jallcom.2014.12.249
Experimental and Numerical Investigation on the Phase Separation Affected by Cooling Rates and Marangoni Convection in Cu-Cr Alloys
Wang, F.; Klinski-Wetzel, K. von; Mukherjee, R.; Nestler, B.; Heilmaier, M.
2015. Metallurgical and materials transactions / A, 46 (4), 1756–1766. doi:10.1007/s11661-015-2745-3
Oxidation Behavior of Binary Aluminium-Rich Fe-Al Alloys with a Fine-Scaled, Lamellar Microstructure
Scherf, A.; Janda, D.; Baghaie Yazdi, M.; Li, X.; Stein, F.; Heilmaier, M.
2015. Oxidation of metals, 83 (5-6), 559–574. doi:10.1007/s11085-015-9535-6
Magnetron Sputtered Mo(Six,Al[1-x])2 Oxidation Protection Coatings for Mo-Si-B Alloys
Lange, A.; Braun, R.; Heilmaier, M.
2015. Oxidation of Metals, 84 (1-2), 91–104. doi:10.1007/s11085-015-9545-4
Creep Resistance and Oxidation Behavior of Novel Mo-Si-B-Ti Alloys
Azim, M. A.; Schliephake, D.; Hochmuth, C.; Gorr, B.; Christ, H.-J.; Glatzel, U.; Heilmaier, M.
2015. JOM, 67 (11), 2621–2628. doi:10.1007/s11837-015-1560-z
Influence of Vanadium on the Oxidation Resistance of the Intermetallic Phase Nb5Si3
Gang, F.; Klinski-Wetzel, K. von; Wagner, J. N.; Heilmaier, M.
2015. Oxidation of metals, 83 (1-2), 119–132. doi:10.1007/s11085-014-9510-7
2014
High-temperature oxidation behavior of Mo-Si-B-based and Co-Re-Cr-based alloys
Gorr, B.; Wang, L.; Burk, S.; Azim, M.; Majumdar, S.; Christ, H.-J.; Mukherji, D.; Rösler, J.; Schliephake, D.; Heilmaier, M.
2014. Intermetallics, 48, 34–43. doi:10.1016/j.intermet.2013.10.008
Correlation between microstructure and properties of fine grained Mo-Mo3Si-Mo5SiB2 alloys
Krüger, M.; Jain, P.; Kumar, K. S.; Heilmaier, M.
2014. Intermetallics, 48, 10–18. doi:10.1016/j.intermet.2013.10.025
Influence of zirconium content on microstructure and creep properties of Mo-9Si-8B alloys
Hochmuth, C.; Schliephake, D.; Völkl, R.; Heilmaier, M.; Glatzel, U.
2014. Intermetallics, 48, 3–9. doi:10.1016/j.intermet.2013.08.017
Influence of the processing technique on the properties of Nb-Si intermetallic composites for high temperature applications processed by MIM and HIP
Mulser, M.; Hartwig, T.; Seemüller, C.; Heilmaier, M.; Adkins, N.; Wickins, M.
2014. Advances in powder metallurgy & particulate Materials - 2014 : proceedings of the 2014 International Conference on Powder Metallurgy & Particulate Materials sponsored by the Metal Powder Industries Federation, May 18 - 22, Orlando, FL. Ed.: R.A. Chernenkoff, 04/8–04/16, Metal Powder Industries Federation
Hall-Petch Breakdown at Elevated Temperatures
Schneibel, J. H.; Heilmaier, M.
2014. Materials transactions, 55 (1), 44–51. doi:10.2320/matertrans.MA201309
High-Temperature Creep and Oxidation Behavior of Mo-Si-B Alloys with High Ti Contents
Schliephake, D.; Azim, M.; Klinski-Wetzel, K. von; Gorr, B.; Christ, H.-J.; Bei, H.; George, E. P.; Heilmaier, M.
2014. Metallurgical and materials transactions / A, 45 (3), 1102–1111. doi:10.1007/s11661-013-1944-z
Influence of Powder Metallurgical Processing Routes on Phase Formations in a Multicomponent NbSi-Alloy
Seemüller, C.; Hartwig, T.; Mulser, M.; Adkins, N.; Wickins, M.; Heilmaier, M.
2014. JOM, 66 (9), 1900–1907. doi:10.1007/s11837-014-1096-7
High-Temperature Creep Behavior of SiOC Glass-Ceramics: Influence of Network Carbon Versus Segregated Carbon
Ionescu, E.; Balan, C.; Kleebe, H.-J.; Müller, M. M.; Guillon, O.; Schliephake, D.; Heilmaier, M.; Riedel, R.
2014. Journal of the American Ceramic Society, 97 (12), 3935–3942. doi:10.1111/jace.13206
2013
Influence of microstructure and processing on mechanical properties of advanced Nb-silicide alloys
Seemüller, C.; Heilmaier, M.; Hartwig, T.; Mulser, M.; Adkins, N.; Wickins, M.
2013. MRS online proceedings library, 1516, 317–322. doi:10.1557/opl.2012.1655
Effect of Ti (Macro-) Alloying on the High-Temperature Oxidation Behavior of Ternary Mo–Si–B Alloys at 820–1,300 °C
Azimovna Azim, M.; Burk, S.; Gorr, B.; Christ, H.-J.; Schliephake, D.; Heilmaier, M.; Bornemann, R.; Bolívar, P. H.
2013. Oxidation of metals, 80 (3-4), 231–242. doi:10.1007/s11085-013-9375-1
A Study on Effect of Reactive and Rare Earth Element Additions on the Oxidation Behavior of Mo–Si–B System
Majumdar, S.; Burk, S.; Schliephake, D.; Krüger, M.; Christ, H.-J.; Heilmaier, M.
2013. Oxidation of metals, 80 (3-4), 219–230. doi:10.1007/s11085-013-9374-2
The effect of micro-alloying with Zr and Nb on the oxidation behavior of Fe₃Al and FeAl alloys
Janda, D.; Fietze, H.; Galetz, M. C.; Heilmaier, M.
2013. Intermetallics, 41, 51–57. doi:10.1016/j.intermet.2013.04.016
Microstructural and micro-mechanical properties of Mo-Si-B alloyed with Y and La
Majumdar, S.; Kumar, A.; Schliephake, D.; Christ, H.-J.; Jing, X.; Heilmaier, M.
2013. Materials science and engineering / A, 573 (June), 257–263. doi:10.1016/j.msea.2013.02.053
Effect of Yttrium Alloying on Intermediate to High-Temperature Oxidation Behavior of Mo-Si-B Alloys
Majumdar, S.; Schliephake, D.; Gorr, B.; Christ, H.-J.; Heilmaier, M.
2013. Metallurgical and materials transactions / A, 44 (5), 2243–2257. doi:10.1007/s11661-012-1589-3
Influence of fiber alignment on creep in directionally solidified NiAl-10Mo in-situ composites
Seemüller, C.; Heilmaier, M.; Haenschke, T.; Bei, H.; Dlouhy, A.; George, E. P.
2013. Intermetallics, 35 (April), 110–115. doi:10.1016/j.intermet.2012.12.007
Microstructural features of switched Cu-Cr surface melt layers
Klinski-Wetzel, K. von; Kowanda, C.; Rettenmaier, T.; Heilmaier, M.; Hinrichsen, V.; Mueller, F. E. H.
2013. 18th Plansee Seminar, 3-7 June 2013 [Konferenz]
Effects of Zr Additions on the Microstructure and the Mechanical Behavior of PM Mo-Si-B Alloys
Krüger, M.; Schliephake, D.; Jain, P.; Kumar, K. S.; Schuhmacher, G.; Heilmaier, M.
2013. JOM, 65 (2), 301–306. doi:10.1007/s11837-012-0475-1
2012
Parameters influencing the electrical conductivity of CuCr alloys
Klinski-Wetzel, K. von; Kowanda, C.; Böning, M.; Heilmaier, M.; Müller, F. E. H.
2012. 25th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV’12), Tomsk, Russia, September 2-7, 2012, 392–395, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/DEIV.2012.6412536
2011
Fatigue resistance of Fe3Al-based alloys
Gang, F.; Krüger, M.; Laskowsky, A.; Rühe, H.; Schneibel, J. H.; Heilmaier, M.
2011. Intermetallic-based alloys for structural and functional applications : symposium held november 29 - december 3, Boston, Massachussetts, U.S.A.; [Symposium N, "Intermetallic-Based Alloys for Structural and Functional Applications" held ... at the 2010 MRS Fall Meeting]. Ed.: M. Palm, 59–64, Materials Research Society. doi:10.1557/opl.2011.26
Microstructural and mechanical properties of ternary Mo-Si-B alloys resulting from different processing routes
Krüger, M.; Heilmaier, M.; Shyrska, V.; Loboda, P. I.
2011. Intermetallic-based alloys for structural and functional applications : symposium held november 29 - december 3, Boston, Massachussetts, U.S.A.; [Symposium N, "Intermetallic-Based Alloys for Structural and Functional Applications" held ... at the 2010 MRS Fall Meeting]. Ed.: M. Palm, 361–366, Materials Research Society. doi:10.1557/opl.2011.188
2010
Tracking of RRR value and microstructure in high purity niobium along the production chain from the ingot to the finished cavity
Janda, D.; Heilmaier, M.; Singer, G. X.; Singer, W.; Simader, W.; Grill, R.
2010. 1st International Particle Accelerator Conference, IPAC 2010; Kyoto; Japan; 23 May 2010 through 28 May 2010, 435–437, ACFA