| About this Abstract |
| Meeting |
TMS Specialty Congress 2025
|
| Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
| Presentation Title |
In-Situ Characterization of Supercritical Martensitic Phase Transformations in NiFeGaCo Single Crystals Using High-Energy Diffraction Microscopy |
| Author(s) |
Timothy Thompson, Abdulhamit Sarac, Sangwon Lee, Amlan Das, Fei Xiao |
| On-Site Speaker (Planned) |
Timothy Thompson |
| Abstract Scope |
Superelastic behavior, enabled by reversible martensitic phase transformations, has been observed in many multiferroic materials like shape memory alloys. Typically, martensitic phase transformations involve the formation and migration of interfacial stress fields at phase interfaces, causing hysteresis and degradation of superelastic behavior. However, recent research indicates that above a critical temperature (in a supercritical thermodynamic state), the transformation occurs with exceptional cyclic stability and no hysteresis. This study uses high-energy diffraction microscopy (HEDM) to characterize martensitic phase transformations below ("subcritical") and above ("supercritical") the critical temperature during compression of NiFeGaCo ferromagnetic shape memory alloys. In-situ HEDM experiments are supported by in-situ differential interference contrast (DIC) optical microscopy. Results reveal the evolution of martensite within single crystals and changes in phase interfaces. These findings will enhance the fundamental understanding of supercritical martensitic phase transformations. |
| Proceedings Inclusion? |
Undecided |