Abstract

Martensitic transformations are diffusionless, displacive, and shear-like in nature. This being the case, they are substantially influenced by an applied stress. Here, it is convenient to distinguish between stress-assisted and strain-induced transformations. Many alloys which exhibit a thermoelastic type of martensitic transformation show a shape memory effect, and related phenomena such as two-way shape memory, supereiasticity and martensite-to-martensite transformations. In these alloys the mode of deformation of the martensite is quite unusual. Certain martensite orientations grow at the expense of others, resulting in a single crystal of martensite, which upon heating reverts to its parent phase in a unique manner. These, and other topics are considered.

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