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采用X射线衍射分析、透射电镜观察、显微硬度测试和拉伸试验等分析方法,研究了生物医用Ti-25Nb-10Ta-1Zr-0.2Fe(TNTZF)合金在-20℃温度下,轧制下压量为40%~80%变形过程中相组成、微观组织和力学性能的变化。结果表明:低温轧制过程中,合金发生了应力诱发α″马氏体相变。随着轧制变形量的增加,合金中位错密度不断增加,晶粒逐渐细化,合金的强度不断升高,弹性模量降低。TNTZF合金经60%轧制变形后,具有高强度、低模量以及适中的的塑性,综合力学性能优异,适合用于制造医疗器械。
The effects of Ti-25Nb-10Ta-1Zr-0.2Fe (TNTZF) alloy on the microstructure and properties of Ti-25Nb-10Ta-1Zr-0.2Fe The change of phase composition, microstructure and mechanical properties during deformation is 40% ~ 80%. The results show that the stress-induced α "martensitic transformation takes place during the low-temperature rolling process, and the dislocation density in the alloy increases with the increase of the rolling deformation, and the grain size decreases gradually and the strength of the alloy increases High and low elastic modulus.TNTZF alloy has high strength, low modulus and moderate plasticity after 60% rolling deformation, and has excellent comprehensive mechanical properties and is suitable for manufacturing medical devices.