摘要
β钛合金具有良好的力学性能、高耐蚀性以及优异的生物相容性,在生物医用材料领域备受关注。β钛合金的超弹性归因于应力诱发的β→α"马氏体相变及其逆转变。阐述了影响β钛合金超弹性的因素,归纳了提高合金超弹性的方法。通过添加合金元素调整相变温度和滑移临界应力使得应力诱发马氏体相变更易发生,延迟β相塑性变形的发生,能够获得更大的相变应变和超弹性回复。通过优化热处理工艺和加工方法调控合金的相组成、晶粒尺寸、位错密度和织构等,也可提高合金的可回复应变,增强合金的超弹性。
βtitanium alloys have attracted great attention in the field of biomedical materials due to the good mechanical properties,high corrosion resistance and excellent biocompatibility.The superelasticity ofβtitanium alloys is attributed to the stress-inducedβ→α"martensitic transformation and its reverse transformation.The factors affecting superelasticity ofβtitanium alloy were expounded,and the methods to improve superelasticity were summarized.By adding alloying elements to adjust the transformation temperature and critical stress for slip,the stress-induced martensitic transformation is easier to occur,the plastic deformation ofβphase is delayed,and larger phase transformation strain and superelastic recovery can be obtained.By optimizing the heat treatment process and processing methods to adjust the phase composition,grain size,dislocation density and texture of the alloys,the recoverable strain can be also increased,and the superelasticity of alloys are enhanced.
作者
李强
刘腾飞
王毅豪
胡坤
LI Qiang;LIU Tengfei;WANG Yihao;HU Kun(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Engineering Research Center of High-Performance Medical Device Materials,Shanghai 200093,China)
出处
《有色金属材料与工程》
2022年第1期1-10,共10页
Nonferrous Metal Materials and Engineering
基金
上海市自然科学基金资助项目(15ZR1428400)
上海高性能医疗器械材料工程技术研究中心资助项目(20DZ2255500)。
关键词
Β钛合金
超弹性
马氏体相变
可回复应变
βtitanium alloy
superelasticity
martensitic transformation
recoverable strain
