时效对新型医用Ti-14Mo-2.1Ta-0.9Nb-7Zr合金组织性能的影响  

Structure and Properties of New Medical Ti-14Mo-2.1Ta-0.9Nb-7Zr Alloys with Aging Treatment

作　　者：马琳[1] 李伟[1] 张帅[1] 白娇娇[1] 张忠全[1] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025

出　　处：《稀有金属》2017年第2期126-131,共6页Chinese Journal of Rare Metals

基　　金：贵州省科学技术基金项目(黔科合J字[2013]2102号);贵州大学引进人才科研项目(贵大人基合字(2012)029号)资助

摘　　要：采用真空熔炼法制备出新型医用Ti-14Mo-2.1Ta-0.9Nb-7Zr合金,经800℃保温2 h的固溶处理后,在450和500℃下分别时效2,4,8,12 h。通过金相显微镜(OM)和压缩力学性能测试的方法,研究了不同时效温度、时效时间两个工艺参数对Ti-14Mo-2.1Ta-0.9Nb-7Zr合金显微组织、抗压强度和弹性模量的影响,利用X射线衍射仪(XRD)及扫描电镜(SEM)对合金物相结构和显微组织进行观察并在能谱仪(EDS)上进行元素成分分析。结果表明:在450和500℃下进行相同时间时效,较高温度下抗压强度较低,弹性模量较高。在相同时效温度下,随时效时间的延长,抗压强度先下降再上升而后又下降,而弹性模量呈先上升再下降又上升的趋势。在800℃×2 h的固溶处理后时效450℃×8 h,抗压强度达到2070 MPa,弹性模量降到37.93 GPa,基本符合临床上硬组织植入物的力学性能要求。New medical Ti-14Mo-2.1Ta-0.9Nb-7Zr alloy was fabricated by vacuum melting.The alloy was aged respectively for 2,4,8,12 h at 450 and 500 ℃ after solution treated for 2 h at 800 ℃.The different aging temperatures and time had effect on the microstructure,compressive strength and elastic modulus of Ti-14Mo-2.1Ta-0.9Nb-7Zr alloys.It was investigated by optical microscope（OM） and compressive mechanical properties test.The phase structures and microstructures of the alloys were observed by X-ray diffraction（XRD） and scanning electron microscope（SEM）,and the element composition was analyzed by energy disperse spectroscopy（EDS）.The results showed that lower compressive strength and higher elastic modulus could be obtained at higher temperature when the alloys were aged for the same time at 450 and 500 ℃.With the same temperature,the compressive strength decreased first,then increased and decreased finally; the elastic modulus increased first,then decreased and increased finally.After solution treatment for 2h at 800 ℃ and aging for 8 h at 450 ℃,the compressive strength（2070 MPa） and the elastic modulus（37.93 GPa） could meet the requirements for the mechanical properties of clinical hard tissue implant basically.

关 键 词：Ti-14Mo-2.1Ta-0.9Nb-7Zr合金 固溶时效 抗压强度 弹性模量 

分 类 号：TG146.23[一般工业技术—材料科学与工程]