| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM VI): Principle, Processing and Properties
|
| Presentation Title |
Extreme Processing of Binary NiTi Shape Memory Alloys |
| Author(s) |
Peter Martin Anderson, Noah Kohlhorst, Daniel Hong, Sriran Vijayan, Nan Li, Tomas Grejtak, Daniel Huber, Brian Thurston, George T Gray, Jay Tiley, Glenn Daehn, Boyd Panton |
| On-Site Speaker (Planned) |
Peter Martin Anderson |
| Abstract Scope |
This work explores processing of binary NiTi shape memory alloys (SMA) at deformation rates exceeding 104/s. Two approaches were employed: (1) augmented laser impact welding of the SMA and brass and (2) Taylor impact studies of SMA cylinders. Of interest is the effect of such large rates on the competition between the stress-induced martensitic transformation, detwinning, and austenite/martensite plasticity. Nanoindentation reveals that the high strain-rate processing imparts up to a 50% increase in hardness and a 50% decrease in hysteresis while maintaining up to 80% recoverable displacement. These trends are attributed in part to a bimodal grain size encompassing nanocrystalline to micron scales and suggest that heterostructured SMAs created by large strain rates may offer the potential for superior shape memory properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Phase Transformations, |