Mechanical properties and shape memory behavior of Ti-Mo-Ga alloys
Mechanical properties and shape memory behavior of Ti-Mo-Ga alloys
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DOI：
10.2320/matertrans.45.1090
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发表时间：
2004-04-01
影响因子：
1.2
通讯作者：
Miyazaki, S
中科院分区：
文献类型：
--
作者：
Kim, HY;Ohmatsu, Y;Miyazaki, S
研究了Ti-Mo-Ga合金的机械性能和形状记忆行为，以开发无镍生物医学形状记忆合金。采用电弧熔炼法制备Ti-Mo-Ga合金。将锭尖冷轧至厚度减少 95%。冷轧试样在673-1273K温度范围内热处理60s-3.6ks。马氏体转变温度随着Mo和Ga含量的增加而降低。最大形状恢复应变是在固溶处理的 Ti-6 at%Mo-3 at%Ga 合金中获得的。 Ti-6 at%Mo-3 at%Ga 的机械性能和形状记忆行为很大程度上取决于热处理条件。在 673-773 K 温度范围内热处理的样品中观察到过早失效。随着热处理温度的升高，极限拉伸强度降低，断裂应变增加。在1073-1273 K温度范围内热处理的样品中获得了形状记忆效应。形状记忆效应是由于应力诱导马氏体转变产生拉伸变形以及卸载后加热时的逆转变而产生的。随着热处理温度和时间的增加，马氏体相变起始温度升高，屈服应力降低。通过循环拉伸试验，Ti-7 at%Mo-4 at%Ga 合金在室温下获得了稳定的超塑行为。预应变 Ti-7 at%Mo-4 at%Ga 合金的恢复应变超过 4%。
Mechanical properties and shape memory behavior of Ti-Mo-Ga alloys were investigated in order to develop Ni-free biomedical shape memory alloys. The Ti-Mo-Ga alloys were fabricated by arc melting method. The ingots were cold-rolled tip to 95% reduction in thickness. The cold-rolled specimens were heat treated in the temperature range 673-1273K for 60s-3.6ks. The martensitic transformation temperature decreased with increase in Mo and Ga content. The maximum shape recovery strain was obtained in a solution treated Ti-6 at%Mo-3 at%Ga alloy. Mechanical properties and shape memory behavior strongly depend on heat treatment condition in the Ti-6 at%Mo-3 at%Ga. Premature failure was observed in specimens heat treated in the temperature range 673-773 K. Ultimate tensile strength decreased and fracture strain increased with increasing heat treatment temperature. Shape memory effect was obtained in specimens heat treated in the temperature range 1073-1273 K. The shape memory effect was due to the stress induced martensitic transformation yielding tensile deformation and the reverse transformation upon heating after unloading. The martensitic transformation start temperature increased and the yield stress decreased with increasing heat treatment temperature and time. Stable superclastic behavior was obtained in a Ti-7 at%Mo-4 at%Ga alloy at room temperature by cyclic tensile tests. The recovery strain exceeding 4% was achieved in the pre-strained Ti-7 at%Mo-4 at%Ga alloy.