Abstract
The shape memory effect (SME) in Fe-Mn-Si based alloy is associated with γ&elarr;ε martensitic transformation which is caused by motion of the Shockley partial dislocation. The variants in Fe-Mn-Si based alloy could appear the four orientations according to Shouji-Nishiyama (S-N) relation in the austenite phase (A-phase) to the martensitic phase (M-phase). It was reported that the variant formed the single orientation under stress induced transformation and that is the advantage for SME in the variant selection behavior. In this study, the variant selection of Fe-Mn-Si based alloy under stress applied is investigated on the basis of crystallography in the SME with Electron Backscatter Diffraction (EBSD). The amount of shape recovery was quantified by means of bending test and the best recovery ratio was revealed about 83% for the specimen annealed 600[℃]. The SME in improved by not only the increase of A-phase but also the promotion of the single orientation under stress induced transformation. Most of A-phase formed the single orientation with Schmid's factor during the stress-induced martensitic transformation.
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