About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
Nanoindentation of NiTi Shape Memory Alloys |
Author(s) |
Gunther F. Eggeler |
On-Site Speaker (Planned) |
Gunther F. Eggeler |
Abstract Scope |
When exploring the reaction of NiTi based shape memory alloys to nanoindentation, one has to take elementary processes into account, which are related to the nature of the martensitic transformation. In pseudoelastic materials, stress induced martensitic transformations need to be considered. Pseudoplastic materials, on the other hand, show detwinning of their martensitic microstructure. High stress concentrations associated with sharp Berkovich nano indenter tips promote dislocation plasticity. This affects the reversibility of the shape memory effects, which also depends on the presence/absence of coherent precipitates. The contribution highlights nanoindentation research on NiTi shape memory materials which was performed between 2005 and 2015 at the Ruhr-University Bochum, during and shortly after the running period of the collaborative research center SFB 459 on shape memory materials, funded by the German Research Association (DFG). It also discusses recent and related work from other groups and highlights areas in need of further work. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nanotechnology, Phase Transformations, Computational Materials Science & Engineering |