Kavli Affiliate: Xian Chen
| First 5 Authors: Mostafa Karami, Xian Chen, , ,
| Summary:
Shape memory alloys that can deform and then spring back to their original
shape, have found a wide range of applications in the medical field, from heart
valves to stents. As we push the boundaries of technology creating smaller,
more precise tools for delicate surgery treatments, the behavior of these
alloys at tiny scales becomes increasingly crucial. In this study, we discover
that the size effect of critical stress required for stress-induced phase
transformation is not universal. We propose an orientation-dependent power
decay law, indicating a specific increase in critical stress for pillars
smaller than 1 micron meter for the nominally soft [001] and hard [111]
orientations. Additionally, we observe high transformability with 11%
recoverable strain under high stress (2 GPa) through lattice frustration at
200nm scale. This research opens new avenues for exploring the superior elastic
behavior of shape memory alloys for nanodevices.
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