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研究了一种具有低弹性模量(约66 MPa)形状记忆合金Ti-9.5Mo-4Nb-2V-3Al的力学性能与形状记忆效应(SME)。研究结果表明,固溶处理后Ti-9.5Mo-4Nb-2V-3Al合金拉伸过程中伴随发生应力诱发马氏体转变,马氏体组织呈片层状。拉伸变形后的合金试样经223℃保温处理5min后将发生马氏体相的逆转变,合金表现出完全非线性恢复特征,其完全恢复应变量为2.2%。对马氏体相逆转变过程分别采用了X射线衍射仪、差热分析及四点电阻法进行了研究,Ti-9.5Mo-4Nb-2V-3Al合金的马氏体逆转变开始温度Ms为92℃,转变结束温度Mf为105℃。
The mechanical properties and shape memory effect (SME) of a Ti-9.5Mo-4Nb-2V-3Al alloy with low elastic modulus (about 66 MPa) were studied. The results show that the solution-treated Ti-9.5Mo-4Nb-2V-3Al alloy with stress-induced martensitic transformation occurs during the stretching process, lamellar martensite. Tensile deformation of the alloy sample after heat treatment at 223 ℃ 5min after the martensitic transformation will occur, the alloy showed a completely non-linear recovery characteristics, the fully recovered strain of 2.2%. X-ray diffraction, differential thermal analysis and four-point resistance method were used to study the inverse transformation process of martensite. The onset temperature of martensitic transformation of Ti-9.5Mo-4Nb-2V-3Al alloy was 92 ° C, and the transition end temperature Mf was 105 ° C.