Experimental Demonstration of Thermally Activated Shape-Memory Alloys under Extreme Cryogenic Conditions
DOI:
https://doi.org/10.2026/11x0b984Abstract
This letter experimentally demonstrates the thermally activated shape-memory behavior of a NiTi alloy under extreme cryogenic conditions down to 20 K. Cylindrical samples were subjected to controlled thermal cycling between 20–150 K under constant tensile loadings, revealing a sharp increase in Young's modulus below 50 K and a reduction in shape-restoring coefficient from 98% at 300 K to 62% at 20 K. The novel alloy exhibited recovery strain of 8.2% at 10 K and extended functional response up to 350 K. These findings confirm the feasibility of SMA operation in deep-space and superconductor environments.
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