Effect of thermo-mechanical treatment on Ti-Ta-Hf high temperature shape memory alloy
Effect of thermo-mechanical treatment on Ti-Ta-Hf high temperature shape memory alloy
复制标题
形变热处理对Ti-Ta-Hf高温形状记忆合金的影响
DOI：
10.1016/j.pnsc.2021.09.004
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发表时间：
2021-10-18
影响因子：
4.7
通讯作者：
Gao, Zhiyong
中科院分区：
文献类型：
--
作者：
Li, Jun;Yi, Xiaoyang;Gao, Zhiyong
研究了Ti-Ta-Hf合金经不同热机械处理后的显微组织、马氏体相变和力学性能。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。铸态和固溶处理后的Ti-Ta-Hf合金均由α“马氏体相和少量的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的Ti-Ta-Hf合金。这是固溶处理后Ti-Ta-Hf合金具有较高屈服应力和上级应变恢复特性的原因。固溶处理后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%。
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 alpha"martensite phase and smaller volume of beta 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.