Ti-3Zr-Mo-15Nb医用钛合金的显微组织及力学性能  

Microstructure and Mechanical Properties of Ti-3Zr-Mo-15Nb Medical Titanium Alloys

作　　者：麻西群 于振涛 牛金龙 余森 韩建业 张亚峰 

机构地区：[1]NW Inst Nonferrous Met Res, Ctr Biomat, Xian 710016, Peoples R China

出　　处：《稀有金属材料与工程》2010年第11期1956-1959,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(30770586,30870611);国家“973”计划(2005CB623904)

摘　　要：采用DSC和XRD检测并分析了Ti-3Zr-Mo-15Nb钛合金的相转变规律,结合金相显微镜、TEM和拉伸测试,系统研究了加工工艺、热处理制度对该合金显微组织及力学性能的影响。结果表明,Ti-3Zr-Mo-15Nb合金在α+β区加工,经固溶处理得到细小的等轴晶。合金经β相区淬火后形成了一种亚稳斜方马氏体α″相。低温时效处理后,α″相部分分解为α相,且随时效温度升高而完全分解为α相。250℃时效的合金综合力学性能与人体骨骼最为接近,可达到高强度、低模量、高塑性的最佳匹配。微观组织分析表明,少量的α″斜方马氏体、α马氏体和一定数量的位错相互作用,可得到较低的弹性模量和较高的塑性,而大量交叉的细小针状α马氏体对合金的综合生物力学性能有明显的贡献。The phase transition rule of near-beta Ti-3Zr-Mo-15Nb (TLE) medical titanium alloys was analyzed through DSC curves and XRD patterns; effects of the processing and the heat treatment on microstructure and mechanical properties of the TLE alloys was investigated by OM, TEM and tensile experiments. The results show that fine and equiaxed grains in the TLE alloy are formed after rolling in the (alpha+beta) phase field and solution-treatment; quenching of the beta phase filed results in the formation of a metastable martensitic structure alpha '' (orthorhombic). After low-temperature aging, some of alpha '' martensite is decomposed into alpha martensite; with the aging temperature increasing, alpha '' martensite is absolutely decomposed into alpha martensite. When the aging temperature is 250 degrees C, high strength, low modulus and high plasticity of the alloy can match preferably with human bone. The microstructure observation of the alloy indicates that the interaction between a few alpha '' orthorhombic martensite, alpha martensite and certain dislocation lead to lower elastic modulus and higher plasticity, while a lot of cross martensite which are fine and needle-like contribute greatly to biomechanical property.

关 键 词：医用钛合金 合金显微组织 综合力学性能 Titanium Alloys Medical Mechanical Properties 马氏体 低温时效处理 生物力学性能 热处理制度 金相显微镜 最佳匹配 相互作用 系统研究 温度升高 微观组织 塑性 人体骨骼 拉伸测试 加工工艺 

分 类 号：R318.0[医药卫生—生物医学工程] TG146.23[医药卫生—基础医学]