Optimization of Shape Memory Effect in Fe-Mn-Si-Cr-Re Shape Memory Alloys

Fe-Mn-Si-Cr based shape memory alloys (SMAs) have desirable formability, shape memory effect (SME) and lower cost compared to Ti-Ni SMAs. These properties make Fe-Mn-Si-Cr SMAs ideal candidates for the application of pipe coupling and fish plates. In this study we add Rhenium (Re) slightly (0.05~0.3 wt%) to Fe-30Mn-6Si-5Cr alloys to improve their shape memory effect (SME). Heat treatments are conducted to further increase the SME. The specimens with best SME are subjected to thermo-mechanical treatment and shape memory training for the optimization of their SME performance.