Tensile deformation behavior of Ti-Nb-Ta-Zr biomedical alloys
Tensile deformation behavior of Ti-Nb-Ta-Zr biomedical alloys
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DOI：
10.2320/matertrans.45.1113
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发表时间：
2004-04-01
影响因子：
1.2
通讯作者：
Akahori, T
中科院分区：
文献类型：
--
作者：
Sakaguch, N;Niinomi, M;Akahori, T
选择Ti-30Nb-10Ta-5Zr的组成，其简化为开发用于生物医学应用的Ti-29Nb-13Ta-4.6Zr合金的组成，然后在基本组成中的Nb含量从20%变化到35%。通过加卸载拉伸试验和变形显微组织表征，研究了Ti-Nb-Ta-Zr系合金的变形机制。Ti-20Nb-10Ta-5Zr和Ti-25Nb-10Ta-5Zr合金的应力-应变曲线的卸载和再加载行为达到约2%的应变，这与在发生应力诱导马氏体转变的亚稳β型钛合金中获得的行为相似。这表明这些合金中发生了应力应变诱发马氏体相变。Ti-30Nb-10Ta-5Zr合金的弹性变形不服从虎克定律。然而，在该合金的应力-应变曲线中，直到约2%的应变，应力或应变诱发马氏体转变的行为不被识别。Ti-20 Nb-10 Ta-5 Zr合金、Ti-25 Nb-10 Ta-5 Zr合金和Ti-35 Nb-10 Ta-5 Zr合金断裂的主要变形机制分别被确定为β相到α "相的变形诱发马氏体转变、β相到α"相和变形孪晶的变形诱发马氏体转变以及滑移。Ti-30Nb-10Ta-5Zr合金的形变机制不能用滑移、形变孪晶和形变诱发马氏体相变来解释。然而，在该合金中观察到的超弹性行为预期在没有形变诱导的马氏体转变的情况下发生。
The composition of Ti-30Nb-10Ta-5Zr, which is simplified that of the Ti-29Nb-13Ta-4.6Zr alloy developed for biomedical applications, was selected, and then Nb content in the basic composition was varied from 20 to 35%. The deformation mechanisms of such Ti-Nb-Ta-Zr system alloys were investigated by loading-unloading tensile tests and characterizing deformed microstructures. The behavior of unloading and reloading of the stress-strain curves up to strain about 2% of Ti-20Nb-10Ta-5Zr and Ti-25Nb-10Ta-5Zr alloys is similar to that obtained in metastable beta type titanium alloys where the stress induced martensite transformation occurs. This indicates that the stress and strain induced martensite transformation occurred in these alloys. Furthermore, the elastic deformation of Ti-30Nb-10Ta-5Zr alloy disobeys Hooke's law. However, the behavior of stress or strain-induced martensite transformation does not recognized in the stress-strain curve up to strain about 2% of this alloy. The main deformation mechanism up to fracture of Ti-20Nb-10Ta-5Zr alloy, Ti-25Nb-10Ta-5Zr alloy and Ti-35Nb-10Ta-5Zr alloy is identified as the deformation - induced martensite transformation of phase beta to alpha" phase, deformation-induced martensite transformation of beta phase to alpha" phase and deformation twin, and slip, respectively. The deformation mechanisms for Ti-30Nb-10Ta-5Zr alloy are not explained by slip, deformation twining and deformation-induced martensite transformation. However, the super elastic behavior observed in this alloy is expected to occur without deformation-induced martensite transformation.