This work studied the microstructure, superelastic and mechanical performances of a high Zr-containing Ti–40Zr–8Nb–2Sn (at.%) shape memory alloy aged at 300 °C for 1 h. Nanodomains and quite fine nano-scaled ω_iso phases with 2.1–2.9 nm wide and 2.9–4.4 nm long were formed in the aged alloy. The aged alloy in this study exhibited excellent superelasticity with a large total recovery strain of 7.1%, high ductility of 11.6% and high yield stress of 578 MPa, indicating that a good balance of functional and mechanical properties was achieved in the aged alloy. The stress-induced β → α" martensitic transformation occurred in the nanodomain-containing aged Ti–40Zr–8Nb–2Sn alloy.

这项工作研究了一种高含Zr的Ti-40Zr-8Nb-2Sn（at。％）形状记忆合金在300°C时效1 h的微观结构，超弹性和力学性能。纳米域和相当精细的纳米级ω_异宽2.1-2.9 nm和2.9-4.4纳米相长形成老年合金。本研究中的时效合金具有出色的超弹性，总回复应变为7.1％，延展性为11.6％，高屈服应力为578 MPa，表明时效合金在功能和机械性能之间达到了良好的平衡。应力诱导的β→α “马氏体转变发生在含纳米域的时效Ti–40Zr–8Nb–2Sn合金中。