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Inﬂuence of VC Precipitation on the Shape-Memory Effect and Corrosion Resistance on an Fe–Mn–Si–Cr–Ni Alloy

The shape-memory effect (SME) and corrosion resistance of an Fe-20Mn-5Si-10Cr-5Ni- 0.7V-0.2C alloy, before and after aging, were investigated. The results showed that VC precipitation and bending temperatures obviously affect the alloy’s SME. Nearly perfect SME (90.2% of initial 4% bend) was achieved when the 2h aged sample was deformed at 223K. At the meantime, the electrochemical impedance spectroscopy (EIS) showed that the alloy, aged for 2h to 4h, exhibited the worst corrosion resistance in the research system related with the fine VC precipitates. The morphology and distribution of VC were observed by SEM.