两种新型生物医用低弹性模量亚稳β钛合金的设计与性能研究

Design and Performance Study on Two New Low Elastic Modulus MetastableβTitanium Alloys for Biomedical Application

采用无细胞毒性的合金元素Nb、Zr和Mo,应用d-电子合金设计方法设计了两种理论上具有较低弹性模量的新型亚稳β钛合金Ti35Nb8Zr2Mo和Ti20Nb15Zr10Mo。利用WK-Ⅱ型非自耗真空电弧凝壳炉制备了这两种合金,研究了这两种合金的基本力学性能。X-射线分析结果表明设计的两种合金处于固溶态时均由单一的β组成的,符合本研究设计β钛合金的要求。设计的两种合金经不同热处理后,Ti35Nb8Zr2Mo的最低压缩模量为17.7Gpa,Ti20Nb15Zr10Mo的最低压缩模量为14.7GPa,均低于Ti6A14V(锻态)的压缩模量21.8GPa。

Ti35Nb8Zr2Mo and Ti20Nb15Zr10Mo,two new types of metastableβtitanium alloys with theoretical low elastic modulus,are designed with non-cytotoxic elements Nb,Zr and Mo by way of d-electron alloy design method.The said alloys are prepared in WK-Ⅱnon-consumable vacuum arc skull furnace and their basic mechanical properties are studied. The X-ray analysis results indicate that the two alloys consist of singleβphase at solid solution state,which complies with the design requirement ofβtitanium alloy for this study. The two designed alloys are subject to different heat treatments. The minimum compression moduli for Ti35Nb8Zr2Mo and Ti20Nb15Zr10Mo are 17.7 GPa and 14.7 GPa respectively. Both values are less than 21.8 GPa,the compression modulus of Ti6Al4V(forged).