Shape Memory Alloys (SMAs), such as Nitinol, are unique metals that can be bent or deformed at low temperatures but return to their original, pre-set shape when heated. This remarkable behavior is due to a solid-state phase transformation between two distinct crystal structures: martensite and austenite. At cooler temperatures, the alloy exists in the martensite phase — a softer, more flexible structure with lower symmetry. In this state, the material can be reshaped without causing permanent ch

NASA created an airless chainmail tire that transforms shape. | GIGadgets

This alloy remembers its shape, and what's your superpower? More about nitinol: http://bit.ly/2rl0PrD | MEL Science