| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defect and Phase Transformation Pathway Engineering for Desired Microstructures
|
| Presentation Title |
The Effects of Defect Structure on Transformation Properties in NiTi Alloys for Phase Change Thermal Management Applications |
| Author(s) |
Asher C. Leff, Adam Wilson, Darin Sharar |
| On-Site Speaker (Planned) |
Asher C. Leff |
| Abstract Scope |
Recently we have identified a novel application for the Martensitic transformation undergone by NiTi and related alloys: use as a phase change material (PCM) to absorb and release heat isothermally. PCMs are widely used in order to mitigate thermal spikes in electronics but typically involve a solid-liquid transformation. The reversible solid-solid transformation undergone by NiTi has many advantages and we have demonstrated that commercial NiTi has a figure of merit for this application two orders of magnitude higher than the materials currently in use. Engineering the microstructure of NiTi to optimize its performance in this application space is a unique challenge, however. The critical properties are high latent heat of transformation, minimized transformation temperature hysteresis, and high thermal conductivity, properties heavily connected to the defect structure in both phases. In this study the effect of composition and microstructure on these critical properties is explored. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, |