Effect of thermo-mechanical treatment on mechanical and elastic properties of Ti–36Nb–5Zr alloy

作     者：Qingkun Meng Qing Liu Shun Guo Yongqi Zhu Xinqing Zhao 

作者机构：School of Materials Science and EngineeringBeihang University Institute for Advanced MaterialsJiangsu University Division of Science and Technology InformationGeneral Research Institute for Nonferrous Metals 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2015年第25卷第3期

页      面：229-235页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Natural Science Foundation of China (Grant nos. 51271010, 51471017, 51431007 and 51401088) the National 973 Program of China (Grant no. 2012CB619403) the China Postdoctoral Science Foundation (2014M561580) the Natural Science Fund for Colleges and Universities in Jiangsu Province (14KJB430007) the Jiangsu Postdoctoral Science Foundation (1401107C) the Natural Science Foundation of Jiangsu Province (Grant no. BK20140549) supported by the US Department of Energy, Office of Science, and Office of Basic Energy Science under Contract no. DEAC02-06CH11357 

主　　题：Biomedical Ti alloys Martensitic transformation Young’s modulus Elastic constants 

摘      要：The evolutions of phase constitutions and mechanical properties of a β-phase Ti–36Nb–5Zr(wt%) alloy during thermo-mechanical treatment were investigated. The alloy consisted of dual(β t α″) phase and exhibited a double yielding phenomenon in solution treated state. After cold rolling and subsequent annealing at 698 K for 20 min, an excellent combination of high strength(833 MPa) and low modulus(46 GPa) was obtained. The high strength can be attributed to high density of dislocations, nanosized α phase and grain refinement. On the other hand, the low Young’s modulus originates from the suppression of chemical stabilization of β phase during annealing, which guarantees the low β-phase stability. Furthermore, the single-crystal elastic constants of the annealed Ti–36Nb–5Zr alloy were extracted from polycrystalline alloy using an in-situ synchrotron X-ray technique. The results indicated that the low shear modulus C44 contributes to the low Young’s modulus for the Ti–36Nb–5Zr alloy, suggesting that reducing C44 through thermo-mechanical treatment might be an efficient approach to realize low Young’s modulus in β-phase Ti alloys. The results achieved in this study could be helpful to elucidate the origin of low modulus and sheds light on developing novel biomedical Ti alloys with both low modulus and high strength.