Article | REF: M530 V1

Shape memory alloys

Author: Gérard GUÉNIN

Publication date: January 10, 1996

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1. Martensitic transformations

1.1 General features

The term martensitic transformation was originally associated with the transformation that takes place during the quenching of steels: austenite formed at high temperature is transformed into martensite by rapid cooling to avoid diffusion. By extension, the term martensitic transformation designates transitions occurring in a number of alloys and presenting analogous characteristics described by the following definition.

The martensitic transformation is a first-order displacive structural transition featuring homogeneous crystallographic lattice deformation, essentially constituted by shear.

The term first-order displacive means that the transformation involves small but finite...

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Martensitic transformations