合金元素、加工与热处理对医用β型钛合金力学性能的影响及微观分析

Effect of Alloy Element,Process and Heat Treatment on Mechanical Properties of β-Type Biomedical Titanium Alloy

研究了不同合金添加元素(Mo,Sn,Zr,Nb)、加工以及热处理对近β型医用钛合金力学性能和显微组织的影响规律,讨论了保持医用钛合金强度、弹性模量和塑性优良匹配的影响因素和解决办法。研究发现:Ti-Nb-Zr-Mo-Sn合金中增加Zr,Mo,Sn元素含量使合金强化,而增加Mo,Nb元素含量和热加工率利于降低弹性模量;经过固溶处理后强度和弹性模量降低,经时效处理后合金产生弥散强化和细晶强化使强度和弹性模量增加;热轧态和固溶状态下产生应力诱发马氏体而导致较低的屈强比和允许应变,利于二次加工和实际应用。

The influential factors of alloy elements（Mo,Sn,Zr,Nb）,process and heat treatment on microstructure and mechanical properties of near β type titanium alloys were investigated.The effects and methods to keeping better matching on strength,elastic module and plasticity etc.were also discussed.The results showed that adding Zr,Mo,Sn could strengthen Ti alloys,whereas Mo,Nb and larger deforming-rate were helpful to decreased elastic modulus.The strength and modulus of the hot-rolled alloys decreased obviously after solid solution treatment,and then increased after aging treatment resulted from dispersion strengthening and fine grain strengthening.Ti-Zr-Sn-Mo-Nb（TLM）alloy treated as hot rolling and in ST condition leads to lower values of Rp/Rm and Rp/E resulted from stress-induced martensite phase,which is helpful for secondary process and engineering application.