The microstructure, martensitic transformation and mechanical/functional properties of Ti–Ta-Hf alloys with various thermo-mechanical treatments were investigated. The results reveal that the hot-rolling could refine the grain size and introduce a certain number of defects, resulting in the disappearance of martensitic transformation. The as-casted and solution treated Ti–Ta-Hf alloys were composed of α'' martensite phase and smaller volume of β phase. In contrast, the grain size of solution treated Ti–Ta-Hf alloy was slightly less than that of as-casted Ti–Ta-Hf alloy. This should be responsible to the higher yield stress and superior strain recovery characteristics for solution treated Ti–Ta-Hf alloy. The yield stress for the dislocation slip and the maximum recoverable strain of solution treated Ti–Ta-Hf alloy were 723 ​MPa and 5.06%, respectively.

研究了采用各种热机械处理的 Ti-Ta-Hf 合金的显微组织、马氏体转变和机械/功能性能。结果表明，热轧可以细化晶粒并引入一定数量的缺陷，导致马氏体相变消失。铸态和固溶处理的 Ti-Ta-Hf 合金由 α'' 马氏体相和较小体积的 β 相组成。相比之下，固溶处理的 Ti-Ta-Hf 合金的晶粒尺寸略小于铸态 Ti-Ta-Hf 合金的晶粒尺寸。这应该是固溶处理的 Ti-Ta-Hf 合金具有更高的屈服应力和优异的应变恢复特性的原因。固溶处理的 Ti-Ta-Hf 合金的位错滑移屈服应力和最大可恢复应变分别为 723 MPa 和 5.06%，