| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Neutron and X-ray Scattering in Materials Science and Engineering
|
| Presentation Title |
Vibrational thermodynamics of the giant elastocaloric effect in NiCoMnTi alloys |
| Author(s) |
Michael E. Manley, Raymundo Arroyave, Ibrahim Karaman, Douglas Abernathy, Raphael Hermann |
| On-Site Speaker (Planned) |
Michael E. Manley |
| Abstract Scope |
Elastocaloric cooling is among the most promising novel avenues that could revolutionize HVAC applications. The outstanding properties of NiTi and (Ni,Mn)Ti and several other Heusler alloys arise from changes in the vibrational and magnetic entropy upon compression through the martensitic transformation. We have investigated the vibrational thermodynamics in single crystals and polycrystals of two of these alloys at high temperatures using inelastic neutron scattering. The thermodynamic properties of these materials are extracted from the phonon density of states and the phonon dispersion curves are used to identify mode specific information, including significant phonon-magnon interactions. Results indicate a significant boost to the transition entropy because of strong phonon-magnon coupling.
This work was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Energy Conversion and Storage, Phase Transformations |