Abstract

Experiments with cyclic loading-unloading and experiments with heatingcooling under constant stress of TiNi shape memory alloys were carried out. This paper shows that, during the thermomechanical cycles, the transformation stresses of the martensitic transformation and the reverse transformation decrease, but the transformation temperatures increase. The cyclic recovery strain is represented by a relation between the heating temperature, the cooling temperature, the transformation lines in the stress-temperature plane and the transformation strain.

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