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Ansprechpartner

Dr. Karsten Woll

karsten wollWjy3∂kit edu

Telefon +49 721 608 25859

Pulsed Metallurgy on Metallic Thin Films

Combining maximal strength and deformability serves as guidance for the development of future metallic materials. However, the realization is very challenging because strength and ductility/toughness are conflicting properties. This is our motivation to develop metallic thin film composites with optimized strength and deformability.

We develop pulsed metallurgy as a microstructure design tool enabling us to control and link the thin film microstructure to its properties and performance. In greater detail, we strive to the control of phases, their fraction, and their morphology at the nanoscale paving the way to the development of novel nano-composites with tailored mechanical properties.

Pulsed metallurgy utilizes effects of thermal pulsing on metallurgical processes at the nanoscale, such as interdiffusion and phase nucleation and growth. Together with our collaborators, we fabricate the thin films and characterize and model the metallurgical transformations for pre-defined thermal histories and explore:

 

Interdiffusion in metallic multilayers

Methods: TEM, ToF-SIMS

Selected Publications:

  • N. Zotov, K. Woll, F. Mücklich, Intermetallics. 18 (2010) 1507–1516

 

Heating rate effects on phase transformations in nanoscaled metallic multilayers

Methods: Nanocalorimetry, in-situ TEM

Selected Publications:

  • P. Swaminathan, M.D. Grapes, K. Woll et al., J. Appl. Phys. 113 (2013) 0–8
  • M.D. Grapes, T. Lagrange, K. Woll et al., APL Mater. 2 (2014) 116102

 

Rapid phase transformations in reactive materials
(self-propagating reactions)

Methods: Sub-critical rapid heating experiments, in situ synchrotron

Selected Publications:

  • K. Woll, A. Bergamaschi, K. Avchachov et al., Sci. Rep. 6 (2016) 19535
  • K. Woll, I.E. Gunduz, C. Pauly et al., Appl. Phys. Lett. 107 (2015)
  • C. Pauly, K. Woll, B. Bax, F. Mücklich, Appl. Phys. Lett. 107 (2015)
  • K. Woll, J.D. Gibbins, K. Slusarski et al., Combust. Flame. 167 (2016) 259–267

 

Thin Film Mechanics

Methods: Nanoindentation

 

Acknowledgement: The pulsed metallurgy group greatly acknowledges the support by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the Emmy-Noether-Program (project number: WO 2198/1-1).