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.
参考文献
| [1] | 冯颖芳,康浩方,张震.钛合金医用植入物材料的研究及应用[J].稀有金属,2001(05):349-354. |
| [2] | Long M;Rack HJ .Titanium alloys in total joint replacement--a materials science perspective.[J].Biomaterials,1998(18):1621-1639. |
| [3] | Kuroda D.;Morinaga M.;Kato Y.;Yashiro T.;Niinomi M. .Design and mechanical properties of new beta type titanium alloys for implant materials[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):244-249. |
| [4] | Kim JI;Kim HY;Inamura T;Hosoda H;Miyazaki S .Shape memory characteristics of Ti-22Nb-(2-8)Zr(at.%) biomedical alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):334-339. |
| [5] | Laheurte P;Eberhardt A;Philippe MJ .Influence of the microstructure on the pseudoelasticity of a metastable beta titanium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):223-230. |
| [6] | Niinomi M;Akahori T;Nakai M .In situ X-ray analysis of mechanism of nonlinear super elastic behavior of Ti-Nb-Ta-Zr system beta-type titanium alloy for biomedical applications[J].Materials science & engineering, C. Biomimetic and supramolecular systems,2008(3):406-413. |
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