Shape Memory Alloys (SMAs) are a special class of metal alloys, like Nitinol, that can be bent and deformed when cold, but snap back to a programmed shape when heated. From a physics perspective, this happens because of a solid-state phase transformation between two crystal structures: martensite (soft) and austenite (rigid). When the alloy is cold, it enters the martensite phase: flexible, low-symmetry structure that allows bending without permanent atomic rearrangement. When heated, it transit
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