About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Self-organizing Nano-architectured Materials
|
Presentation Title |
Elasto-plastic NiTi Nanofoams for Potential Elastocaloric Cooling Applications Using Molecular Dynamics |
Author(s) |
Arne J. Klomp, Karsten Albe |
On-Site Speaker (Planned) |
Arne J. Klomp |
Abstract Scope |
The prototypical shape memory alloy NiTi exhibits a remarkable elastocaloric response during its martensitic transition and can be employed in solid-state cooling devices. Fast heat transfer from NiTi to the environment can be enabled by a high surface-to-volume ratio. Open porosity NiTi (nanofoam) might be promising for this purpose. We use molecular dynamics simulations to investigate NiTi phase transitions under cyclic thermal and mechanical loading in nanowires and nanofoams. The thermo-mechanical properties of the nanofoam featuring locally changing surface orientation, length scales, and curvature lead to a smooth martensitic transition. The ability of NiTi to accommodate large inelastic strains receives special attention and we show that there is a lower size limit for a reversible martensitic phase transition. Using atomistic simulation we are also able to monitor the caloric effects of NiTi, thus, opening opportunities for evaluating NiTi in conditions close to its potential application. |
Proceedings Inclusion? |
Undecided |
Keywords |
Computational Materials Science & Engineering, Nanotechnology, Phase Transformations |