Zr元素对种植合金Ti-35Nb-4Sn-6Mo-xZr组织和力学性能的影响

摘要

The influence of Zr content on the microstructure and mechanical properties of implant Ti-35Nb-4Sn-6Mo-xZr (x=0,3,6,9,12,15; mass fraction) alloys was investigated.It is shown that Ti-35Nb-4Sn-6Mo-xZr alloys appear to have equiaxed singleβ microstructure after solution treatment at 1023 K.It is found that the grains are refined first and then coarsened with the increase of Zr content.It is also found that Zr element added to titanium alloys has both the solution strengthening and fine-grain strengthening effect,and affects the lattice parameters.With increasing the Zr content of the alloys,the strength increases,the elongation decreases,whereas the elastic modulus firstly increases and then decreases.The mechanical properties of Ti-35Nb-4Sn-6Mo-9Zr alloy are as follows:σb=785 MPa,δ=11％,E=68 GPa,which is more suitable for acting as human implant materials compared to the traditional implant Ti-6Al-4V alloy.%研究Zr元素含量对种植合金Ti-35Nb 4Sn-6Mo-xZr (x=0,3,6,9,12,15;质量分数)组织和力学性能的影响.结果表明,在1023 K下进行固溶处理后,Ti-35Nb-4Sn-6Mo-xZr合金呈现单一的β等轴状组织.随着Zr元素含量的增加,合金的晶粒尺寸先减小后增大.研究还发现,在钛合金中添加Zr元素具有固溶强化和细晶强化的作用,并且影响合金的晶格常数.随着Zr含量的增加,合金的强度逐渐增加,伸长率逐渐降低,合金的弹性模量先升高后降低.与传统的种植合金Ti-6Al-4V相比,Ti-35Nb-4Sn-6Mo-9Zr合金更适合作为人类的种植材料.该合金的力学性能为:σb=785 MPa,δ=11％,E=68 GPa.