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When does a shape memory alloy return to its original shape?

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When does a shape memory alloy return to its original shape?

(a) At transition temperature

(b) At Curie temperature

(c) At memory transfer temperature

(d) At normal temperature

The question was posed to me in an online quiz.

The origin of the question is Metallic Glasses topic in division Advanced Engineering Materials of Engineering Physics II

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Right option is (c) At memory transfer temperature

Explanation: Shape memory alloys are those which change their shape from its original shape to a new shape and while heating or cooling it will come back to its original shape. This shape recovery process doesn’t happen at a single temperature but over a range of temperatures. Thus, the range at which the SMA switches from new shape to its original shape is called transformation temperature or memory transfer temperature.

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