The paper presents the stress self-accommodation characteristic of Fe-Mn-Si shape memory alloy, namely the alloy
causes positive/reverse ε martensitic transformation and accompanied by deformation in order to adapt the variation of
the outside macroscopical stress and deformation. From XRD analysis, it is found that the stress-induced γ↔ε
martensitic transformation and its reverse transformation would occur in Fe-Mn-Si shape memory alloy under the
tension-compression stress and also validated the stress self-accommodation characteristic of Fe-Mn-Si shape memory
alloy. In cycles of tension and compression deformation, the stress self-accommodation characteristic of Fe-Mn-Si shape
memory alloy can increase fatigue life of the alloy by reducing stress concentration, restraining plastics gliding
deformation and delaying the formation and growing of microcracks. The fatigue fracture in Fe-Mn-Si alloy shows
quasi-cleavage brittle rupture type.
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