Relationships between tensile deformation behavior and microstructure in Ti-Nb-Ta-Zr system alloys
Relationships between tensile deformation behavior and microstructure in Ti-Nb-Ta-Zr system alloys
复制标题
DOI：
10.1016/j.msec.2004.12.014
复制
发表时间：
2005-05-01
期刊：
影响因子：
--
通讯作者：
Toda, H
中科院分区：
文献类型：
--
作者：
Sakaguchi, N;Niinomi, M;Toda, H
Ti-Nb-Ta-Zr系合金在生物医用材料组件中的应用越来越受到关注。然而，迄今为止还没有对Ti-Nb-Ta-Zr体系的变形行为进行评估。因此，本研究对不同铌含量的Ti-Nb-Ta-Zr合金的变形行为进行了研究。Ti-20Nb-10Ta-5Zr和Ti-25Nb-10Ta-5Zr在制造过程终加热后的空冷加载-卸载应力-应变曲线行为与具有形状记忆效应的亚稳β型钛合金相似。因此，在Ti-20Nb-10Ta-5Zr和Ti-25Nb-10Ta-5Zr合金中存在形状记忆效应。Ti-30Nb-10Ta-5Zr的弹性变形不符合胡克定律。但在加载-卸载应力-应变曲线上未观察到应力或应变诱发马氏体（SIM）。Ti-25Nb-10Ta-5Zr的变形机制随其显微组织的变化而变化。Ti-25Nb-10Ta-5Zr最终加热后风冷，微观组织由β相中ω相组成。在相中诱导马氏体的应力am几乎等于屈服应力sigma(y)。因此，应力诱发马氏体相变和位错运动同时发生。Ti-25Nb-10Ta-5Zr在制造工艺最后加热后进行水淬，其显微组织由单相组成，其中am小于ay，因此在屈服之前就发生了应力诱导马氏体转变。(c) 2005 Elsevier B.V.版权所有
Ti-Nb-Ta-Zr system alloys are receiving more attention for biomedical material component applications. However, the deformation behavior of the Ti-Nb-Ta-Zr system has not been evaluated to date. Therefore, the deformation behavior of Ti-Nb-Ta-Zr alloys with different Nb contents was investigated in this study.The behaviors of loading-unloading stress-strain curves of Ti-20Nb-10Ta-5Zr and Ti-25Nb-10Ta-5Zr air-cooled after final heating of the manufacturing process are similar to that obtained in metastable beta type titanium alloys that have the shape memory effect. Therefore, the shape memory effect was expected in Ti-20Nb-10Ta-5Zr and Ti-25Nb-10Ta-5Zr alloys. The elastic deformation of Ti-30Nb-10Ta-5Zr disobeyed Hooke's law. However, stress or strain-induced martensite (SIM) is not observed on the loading-unloading stress-strain curve. The deformation mechanism of Ti-25Nb-10Ta-5Zr changes with varying its microstructure. In Ti-25Nb-10Ta-5Zr air-cooled after final heating, the microstructure consisted of an omega phase in a beta phase. The stress for inducing martensite in a phase, am, was nearly equal to the yielding stress, sigma(y). Therefore, stress-induced martensitic transformation and movement of dislocations occurred together. In Ti-25Nb-10Ta-5Zr water-quenched after final heating of the manufacturing process, the microstructure consisted of a single phase, where am is lower than ay, Therefore, stress-induced martensitic transformation occurred before yielding. (c) 2005 Elsevier B.V. All rights reserved.