A simple model to calculate the microstructure evolution in a NiTi SMA
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https://orcid.org/0000-0002-1668-3729
Stefano Natali
University of Rome “La Sapienza”, DICMA, via Eudossiana 18, Roma, Italy
https://orcid.org/0000-0002-2742-0270
Abstract
Shape memory alloys (SMAs) are a wide class of materials characterized by the property to recover the initial shape. This property is due to ability of alloys to change the microstructure from a “parent” microstructure (usually called “Austenite”) to a “product” microstructure (usually called “Martensite”). Considering the tensile resistance, SMAs stress strain curves are characterized by a sort of plateau were the transformations from Austenite to Martensite (in loading condition) and from Martensite to Austenite (in unloading condition) take place. In this work a simple model to predict the microstructure modification has been proposed and verified with an equiatomic NiTi alloy characterized by a pseudo-elastic behavior.
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