A nitinol alloy hardens when heated
Do shape memory alloys (SMA) harden?
We had a piece of this thin shape memory alloy in class (I think it was called Nitinol, but I think that's a brand name). The teacher showed how flexible and bouncy it is and will return to its original shape when put in warm water. Normal metals, when bent back and forth, become hard and then break. Will an SMA break like this? Would the work hardening be reversed by returning it to its original shape?
WetSavannaAnimal aka Rod Vance
When we change the shape of an SMA, its internal crystal structure rearranges into a different shape. However, when we heat the SMA, it uses the thermal energy to convert its crystalline structure to its original shape, thus regaining its original shape. In the end, you can say that hardening work will be undone if it returns to its original state.
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