Alloy Design of FeMnSiCrNi Shape-Memory Alloys Related to Stacking-Fault Energy

摘要

The stacking-fault energy (#gamma#_(sf)) of iron-based shape-memory alloys was calculated by the extendeddislocation-node method. The results show that Ni and Mnincrease the #gamma#_(sf) of the alloys with an austenitestructure, while Cr and Si decrease it. An expression relating thealloying elements of Ni, Cr, Mn, and Si to the #gamma#_(sf) ofthe alloys is established. Moreover, in terms of the #gamma#_(sf)values of the alloys and the Schaeffler diagram, the alloy designof iron-based shape-memory effect (SME), with a martensitetransition temperature (M_s) being a little lower than ambienttemperature. The corresponding composition of the alloy islocated in the #gamma#-phase zone near the phase line betweenthe #gamma# and #gamma#+ #epsilon# in the Schaeffler diagram.