Institute for Applied Materials – Materials Science and Engineering

Research mission

The Physical Metallurgy group focuses on the development of metallic and intermetallic materials for harsh environments. The investigation and optimization of materials for engines operating at high temperatures is of central interest. Therefore, 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 of the research. In addition, fundamentals of contact materials for vacuum switches and the deformation behavior of high-entropy alloys under various conditions are studied in detail.

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)
Microstructure analysis
Microstructure analysis
Microstructure analysis
Scanning electron microscopy
Directional solidification
Materials characterization
Materials synthesis

Recent Publications

flexidsgombola
A zone melting device for the in situ observation of directional solidification using high-energy synchrotron x-rays

Together with our colleagues from Otto von Guericke University and the Helmholtz-Zentrum Geesthacht, we introduced the new state-of-the-art FlexiDS device for time-resolved in-situ investigation of directional solidification processes using high-energy synchrotron radiation. The system is a valuable addition to the infrastructure of PETRA III at DESY, being specifically designed for the use at P07 HEMS beamline. The apparatus is capable of investigating liquid-solid regions, transformations, and decompositions in various structural intermetallic materials. Moreover, we could show the wide operation range by means of sample geometry, densities and alloy compositions as well as process parameter like withdrawal rate. Even during experiments which exceed a liquidus temperature of 2000 °C, the device operated stable and satisfactory diffraction pattern were obtained. Trial tests of time-resolved processes of TiAl and FeAl alloys were presented in this work. Further detailed experimental results are published elsewhere.

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articlegombola
Microstructural Investigations of Novel High Temperature Alloys Based on NiAl-(Cr,Mo)

Previous work on calculation and validation by refinement of the thermodynamic description reported a eutectic trough in the quaternary Ni-Al-Cr-Mo system (Peng et al. in Journal of Phase Equilibria and Diffusion 37 (2016) 592-600). We present an experimentally study on NiAl-(Cr,Mo) eutectic alloys from room to liquidus temperature. The evolving morphologies were categorized into four regions with respect to the Mo concentration (I - IV). Based on in-situ X-ray diffraction experiments during solidification, it has been proven that the different compositions form due to segregation especially in region III. The influence of the segregation on the lattice parameter and thus on the lattice mismatch as well as on the orientation relationship is discussed in this study by comparing the region III alloy NiAl-9.6Cr-10.3Mo to NiAl-34Cr (I) and NiAl-10Mo (IV).

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articlelaube
Controlling crystallographic ordering in Mo-Cr-Ti-Al high entropy alloys to enhance ductility

In this study with our colleagues from Siegen University, we utilized our recently proposed methods to reveal ordering phenomena in HEA (Chen et al. in Acta Materialia 176 (2019) 123-133) to enhance ductility of alloys from within the Mo-Cr-Ti-Al system. The composition-depending transistion to disordered alloys is indeed associated to a drop in yield strength. Nevertheless, ductility at room temperature is significantly enhanced when no ordering is present.

to the article
articleast
Comparison of cryogenic deformation of the concentrated solid solutions CoCrFeMnNi, CoCrNi and CoNi

This contribution on cryogenic deformation of face-centered cubic high entropy alloys was performed in collaboration with colleagues from ITEP at KIT, Ruhr-University Bochum and IFW Dresden. CoCrFeMnNi and CoCrNi are complex concentrated alloys which show significant strengthening and ductility at cryogenic temperatures. The chief contribution for the strength is associated with solute dislocation interaction. A comparison of the yield strength variation with temperature down to 8 K shows that CoCrFeMnNi and CoCrNi have a similarly high solid solution strengthening effect contributing temperature dependent strengthening despite a higher absolute yield strength of CoCrNi at all temperatures. CoCrNi has a reportedly lower SFE leading to formation of ε-martensite at cryogenic temperatures, while CoCrFeMnNi does not. Comparison of work-hardening rates at cryogenic temperatures indicates that both alloys strengthen at similar rates despite the TRIP effect being active in CoCrNi and not in CoCrFeMnNi. The ε-martensite in CoCrNi exists as twin-martensite nano-laminates and strengthens the alloy through dislocation-interface interaction.

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Creep of an Oxidation Resistant Coated Mo-9Si-8B Alloy

The previous work of Prof. Perepezko's group at the University of Wisconsin – Madison shows that the oxidation resistance of Mo-Si-B alloys can be improved significantly by applying an SiO2 layer by the pack-cementation process. In collaboration with the colleagues from Madison, we investigated the effect of the layer stability during time-dependent, mechanical loading at 1200 °C. By applying a constant load at high temperatures, the Mo-Si-B substrate starts to elongate while cracks form within the SiO2 layer perpendicular to the loading direction. However, the formation of cracks does not lead to catastrophic failure of the substrate since the layer starts to fill them with new oxides during a self-healing process.

to the article
articleseils
Temperature dependent strengthening contributions in austenitic and ferritic ODS steels

Strengthening of oxide dispersion strengthened (ODS), powder metallurgical steels with nanometer-sized oxide particles leads to high-strength, creep-resistant materials, which promise increasing application temperatures compared to classic high-temperature steels. In this study, we investigate the temperature dependent strength of ferritic and austenitic ODS steels. It is demonstrated that using elemental powders for mechanical alloying of austenitic ODS steels is preferred. We determine typical strengthening contributions from microstructural information and found that the lower room temperature strength of austenitic ODS steels results from lower contributions by grain boundaries as well as by dislocations compared to ferritic ODS steels. The drop in strength above 500 °C can reasonably be described by annihilation of dislocations at grain boundaries.

to the article
articleobert
On the chemical and microstructural requirements for the pesting-resistance of Mo–Si–Ti alloys

In previous work, we reported on the unexpected pesting-stability of an as-cast eutectic Mo-20Si-52.8Ti (at%) alloy at temperatures below 1000°C. This article in collaboration with Siegen University focuses on the chemical and microstructural requirements of the pesting-resistance. A minimum nominal Ti content of 43 at% is found. This is related to the Ti partitioning in the pesting-critical Mo solid solution. The formation of solid Ti and Si oxides is promoted over the formation of volatile MoO3. The microstructural length scale and the volume fraction of eutectic regions are not influential to pesting-resistance.

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materials KIT, M. Breig
Materials Development
High Entropy Alloys
Additive Manufacturing
directional_solidification KIT, M. Breig
Directional Solidification
atome probe tomography KIT, M. Breig
Atom Probe Tomography

Doctoral theses


Creep behavior of lamellar FeAl/FeAl2 alloys. PhD dissertation.
Schmitt, A.
2020, April 6. Verlag Dr. Hut, München

Publications


2020
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), 093901. doi:10.1063/5.0019020
Characterization of the Microstructure After Composite Peening of Aluminum.
Seitz, M.; Dürrschnabel, M.; Kauffmann, A.; Kurpiers, C.; Greiner, C.; Weidenmann, K. A.
2020. Advanced engineering materials. doi:10.1002/adem.202000575
Oxidation behaviour of NiAl intermetallics with embedded Cr and Mo.
Geramifard, G.; Gombola, C.; Franke, P.; Seifert, H. J.
2020. Corrosion science, 108956. doi:10.1016/j.corsci.2020.108956
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), 961. doi:10.3390/met10070961
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, 139781. doi:10.1016/j.msea.2020.139781
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
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, Article no: 155726. doi:10.1016/j.jallcom.2020.155726
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
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
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, Article no: 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
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
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
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
2019
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.
2019. Acta materialia. doi:10.1016/j.actamat.2019.12.005
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
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
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. doi:10.1016/j.actamat.2019.07.001
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
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
2018
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. 147th Annual Meeting & Exhibition Supplemental Proceedings (TMS), Phoenix, Arizona, March 11-15, 2018, 647–659, Springer, Cham. 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
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
2017
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
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
Creep of binary Fe-Al alloys with ultrafine lamellar microstructures.
Schmitt, A.; Kumar, K. S.; Kauffmann, A.; Li, X.; Stein, F.; Heilmaier, M.
2017. Intermetallics, 90, 180–187. doi:10.1016/j.intermet.2017.07.016
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
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
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, IEEE, Piscataway (NY). doi:10.1109/DEIV.2016.7748695
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
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
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
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
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
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
2015
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, Warrendale (Pa.). 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
2014
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, Princeton (NJ)
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
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, Warrendale (Pa.). 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, Warrendale (Pa.). 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, s.l