About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Anisotropic Response of FeMnGa MMSMA to Magnetic and Thermomechanical Loading |
| Author(s) |
Nana A. Adoo, Grant A Crawford, Nickolaus M Bruno, Parashu Kharel, Jacob Petersen |
| On-Site Speaker (Planned) |
Nana A. Adoo |
| Abstract Scope |
FeMnGa metamagnetic shape memory alloys (MMSMAs) exhibit a first-order martensitic transformation (MT), pronounced magnetostrain, and significant magnetocaloric and elastocaloric effects. This investigation elucidates the crystallographic orientation dependence of MT characteristics in <100> and <110> directions of Fe47.2Mn24.4Ga28.4 single crystals. Transformation characteristics were determined from isofield thermal cycling and isobaric thermomechanical loading. The <110> orientation exhibited superior superelasticity, was able to achieve substantial recoverable strain, high yield strength, and high elastic modulus attributed to efficient martensite variant reorientation and increased twin boundary density. Conversely, the <100> orientation exhibited reduced reversibility and higher irrecoverable strain due to phase instability-induced defects. The <100> orientation exhibited a stronger magnetocaloric effect, while <110> displayed a higher elastocaloric response between 150–360 K, driven by enhanced twin boundary density. These results highlight how crystallographic orientation influences phase stability, mechanical anisotropy, and caloric performance in FeMnGa MMSMAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Mechanical Properties, Process Technology |