High-Entropy Ti45Zr5Pt19Pd25Co6 High-Temperature Shape Memory Alloy with Improved Functional Stability Through In-Service Dislocation Recovery

This study investigates a Ti45Zr5Pt19Pd25Co6 high-temperature shape memory alloy designed for functional stability through high-entropy strengthening and temperature-enabled dislocation recovery. Cyclic testing confirms better stability when the service temperature was extended to 500 °C compared to 400 °C. While 400 °C operation induces instability from dislocations, 500 °C promotes dislocation recovery, as evidenced by cyclic superelastic and microhardness tests. This demonstrates that strategic temperature selection can enhance the longevity of high-temperature high-entropy shape memory alloys.