The shape memory effect in NiTi alloys is primarily due to which stress-induced phase transformation?

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Transformation from austenite to martensiteTransformation from martensite to austeniteTransformation from ferrite to austeniteTransformation from austenite to ferrite

Explanation

The shape memory property of NiTi is caused by the stress-induced transformation of the crystal structure from austenite to martensite. This reversible phase change allows the material to recover its original shape upon heating.