Shape memory thermoelastic behavior

Shape memory effect (SME) Thermoelastic behavior of some alloys which can revert back to their original shape when the temperature is greater than the phase transformation temperature of the... 

The SME behavior is basically a consequence of a martensitic transformation. When compared, shape-memory alloys are found to have common characteristics such as atomic ordering, a thermoelastic martensitic transformation that is crystallographically reversible, and a martensite phase that forms in a self-accommodating... 

Figure 10.38 Typical stress-strain-temperature behavior of a shape-memory alloy, demonstrating its thermoelastic behavior. Specimen deformation, corresponding to the curve from A to B, is carried out at a temperature below that at which the martensitic transformation is complete (i.e., Mf of Figure 10.37). Release of the applied stress (also at Mf) is represented by the curve BC. Subsequent heating to above the completed austenite-transformation temperature Af, Figure 10.37) causes the deformed piece to resume its original shape (along the curve from point C to point D).

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