About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-86: Geometric Tailoring of Nitinol Thin Films for Improved Elastocaloric Cooling |
| Author(s) |
Juyoung Lee, Hyemin Ryu, Jae-Hoon Choi, Gi-Dong Sim |
| On-Site Speaker (Planned) |
Juyoung Lee |
| Abstract Scope |
Shape memory alloys (SMAs) are recognized as a representative material exhibiting elastocaloric behavior. This material property can be exploited in the design of solid-state refrigerants, offering advantages over conventional vapor-compression refrigeration systems in terms of scalability and coefficient of performance (COP)—defined as the ratio of heat absorption to input work. The COP of an SMA-based elastocaloric system can be improved by reducing work dissipation induced by microscopic friction during martensitic transformation, as reflected by a narrower hysteresis loop observed in the cyclic stress-strain response. We aim to reduce the hysteresis area observed in the cyclic responses of freestanding Nitinol SMA thin films by incorporating hourglass-shaped and porous geometry specimen designs. Finite element analysis (FEA) was also conducted to examine the phase transformation process throughout deformation of the geometrically-tailored films.These findings suggest geometric optimization as a viable route for developing high-efficiency micro-scale cooling devices. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Mechanical Properties, Modeling and Simulation, Phase Transformations |