The shape-memory effect relies on deformation in the martensitic state by motion of intervariant boundaries in response to an applied stress. A mechanism for this process in terms of interfacial defect generation, motion and interaction is proposed. This mechanism is conservative and is expected to operate with modest applied stresses and without thermal activation. Experimental observations of intervariant boundaries are discussed and atomistic simulations of the mechanism in such boundaries in hexagonal metals are presented.
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Pond, R.C., Celotto, S. Mechanism of Deformation by Intervariant Boundary Motion in Shape-Memory Materials. MRS Online Proceedings Library 652, 111 (2000). https://doi.org/10.1557/PROC-652-Y11.1