Temperature dependence of critical stress and pseudoelasticity in a Fe–Mn–Si–Cr pre-rolled alloy

In this work, the mechanical behavior of Fe–28Mn–6Si–5Cr (wt.%) shape memory alloy subjected to a simple thermomechanical treatment consisting in rolling at 600 °C and subsequent aging at 800 °C for 10 min is studied. Martensite can be stress-induced in this material up to 110 °C. No stress-induced martensite was detected at temperatures above 150 °C. Extrapolating the mechanical testing data a yield stress for the austenite at room temperature σy = 450 MPa was calculated. In addition, a relatively large pseudoelastic behavior was observed at the temperature range between 90 and 110 °C. This effect is discussed on the basis of the formation of stacking faults and the reversible movement of their associated partial dislocations.