生物医用Ti-Nb-Sn合金的超弹性  

Superelasticity of Ti-Nb-Sn Biomedical Alloy

作　　者：王涛[1] 戴品强[1] 项忠楠[1] 杨俊强[1] 谢宇玲[1] 

机构地区：[1]福州大学材料学院,福建福州350108

出　　处：《材料科学与工程学报》2008年第6期940-945,共6页Journal of Materials Science and Engineering

基　　金：福州大学科技发展基金资助项目(2004-XQ-02)

摘　　要：通过室温下拉伸实验研究了Ti-14Nb-4Sn和Ti-16Nb-4Sn(at.%)合金的超弹性。发现锻造态和400℃冰水淬火态的Ti-16Nb-4Sn合金超弹性良好,通过4%变形量循环拉伸三次即可获得完全的超弹性;而400℃冰水淬火态的Ti-14Nb-4Sn合金通过3%变形量循环拉伸两次即可完全回复。Ti-14Nb-4Sn合金和Ti-16Nb-4Sn合金均以700℃冰水淬火态断裂延伸率为最大,分别为14.42%和12.02%。锻造态Ti-14Nb-4Sn合金的马氏体逆相变回复温度As为134.8℃。XRD分析结果表明室温下Ti-16Nb-4Sn合金的组织为β相和+α″马氏体相;而Ti-14Nb-4Sn合金的室温组织除β和α″外,还存在α相。The superelasticity of Ti-14Nb-4Sn and Ti-16Nb-4Sn （at. %） alloys was investigated by tensile test at room temperature. The results show that the forged sample and the sample quenched from 400℃ of Ti-16Nb-4Sn alloy have excellent superelasticity. Complete superelasticity was obtained at the third cycle under strain of 4~ while the sample quenched from 400℃ of Ti-14Nb-4Sn alloy exhibited complete superelasticity at the second cycle under strain of 3%. The samples quenched from 700℃ of Ti-14Nb-4Sn alloy and Ti-16Nb-4Sn alloy have the best elongation to failure of 14.42% and 12.02%, respectively. The reverse martensitie transformation temperature （As） of the forged sample is 134.8℃ for Ti- 14Nb-4Sn alloy.. X-ray diffraction measurements showed that Ti-16Nb-4Sn ahoy was composed of β and martensite α″ at room temperature while α was detected in Ti-14Nb-4Sn alloy besides β and martensite α″.

关 键 词：Ti—Nb—Sn形状记忆合金 超弹性 马氏体相变 淬火 

分 类 号：TG139.6[一般工业技术—材料科学与工程]