| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
Macroscopic energy barrier and thermodynamic hysteresis in magnetic shape memory alloys |
| Author(s) |
Yongmei M. Jin, Yu U. Wang |
| On-Site Speaker (Planned) |
Yongmei M. Jin |
| Abstract Scope |
Long-range elasto/electro/magnetostatic interactions play crucial roles in the phase transformation and domain evolution processes in ferroelastic/electric/magnetic materials. This presentation focuses on the significance of elastic and magnetic interactions in the hysteretic behaviors in magnetic shape memory alloys, which are material systems with both ferroelastic and ferromagnetic natures. These findings are generally applicable to other ferroic and multiferroic materials. We analyzed the elastic energy barriers associated with volumetric transformation strain and magnetostrictive strain, and their effects on the hysteretic behaviors in austenite-martensite phase transition and magnetic field-induced twin boundary motion in the martensitic state. The similar effect of magnetic interaction energy on hysteresis is also discussed. Both elastic and magnetic energy barriers are macroscopic in nature and cannot be surmounted by thermal fluctuations, resulting in rate-independent thermodynamic hysteresis that differs from rate-dependent kinetic hysteresis. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Modeling and Simulation, Magnetic Materials |