作　　者： ; ; ; ;

机构地区： 天津大学材料科学与工程学院

出　　处： 《功能材料》 2011年第11期1985-1988,共4页

摘　　要： 采用非自耗电弧熔炼方法制备Ti-24%(原子分数)Nb-(0、2、4)%(原子分数)Zr合金铸锭。铸锭经均匀化退火、固溶、冷轧和退火后,在室温下进行拉伸测试和加载卸载测试。使用光学显微镜、X射线衍射、透射电子显微镜观察试样拉伸前后组织结构变化,并结合合金拉伸曲线分析合金变形机制。结果表明具有较低强度的Ti-24%(原子分数)Nb合金出现{112}〈111〉孪晶,Zr元素的添加提高了合金强度和β相稳定性,{112}〈111〉孪晶消失,出现{332}〈113〉孪晶。加载卸载测试中合金发生应力诱发α″马氏体转变和逆转变,具有超弹性性能。Ti-24%(原子分数)Nb-2Zr合金具有较稳定的3.6%的超弹性回复,具有成为生物医用材料的潜力。 The ingots with composition of Ti-24at%Nb-（0,2,4）at% Zr were prepared by non-consumble arc melting methods.They were homogenized,solution treated,cold rolled,and annealed in turn.Tensile tests and loading-unloading tests were carried out at room temperature.Changes of microstructure before and after tensile tests were observed by optical microscope,X-ray diffraction and transmission electron microscope.Deformation mechanisms were determined by analyzing microstructure and tensile curves.The results showed that {112} 〈111〉 twinning appeared in Ti-24at%Nb alloy with low strength.The addition of Zr improved the strength of alloys and stability of β phase.In this case,{112} 〈111〉 twinning disappeared with the formation of {332}〈113〉 twinning.Due to the appearance of a stress-induced α″ martensite transformation,the alloys showed super-elasticity in tensile loading-unloading tests.Ti-24at%Nb-2at%Zr with a super-elastic recovery of 3.6% is potential to be applied as biomaterials.

关 键 词： 钛合金 变形机制 孪晶 超弹性

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]