低弹性模量Ti-27Nb-8Zr医用钛合金组织与力学性能

利用光学显微镜、扫描电镜和X射线衍射仪研究Ti-27Nb-8Zr(质量分数, %)医用钛合金固溶后在不同时效温度下组织的变化规律，重点讨论不同显微组织对合金弹性模量和强度的影响。结果表明，固溶处理后，合金组织由β+α”两相构成，具有相对低的弹性模量和强度；时效后，组织中包含β、α、ω三相，弹性模量和强度显著升高，随着时效温度的升高，组织长大，弹性模量和强度降低

Microstructure and Mechanical Properties of Biomedical Ti-27Nb-8Zr Alloy with Low Elastic Modulus

Microstructure evolutions of Ti-27Nb-8Zr (mass fraction, %) biomedical alloy subjected to different aging treatments after solution treatment were studied by optical microscopy, scanning electron microscopy and X-ray diffraction, and the influence of various microstructures on the elastic modulus and tensile strength was discussed. The results indicate that the Ti-27Nb-8Zr alloy after solution treatment consists of β+a" phases and has relatively lower elastic modulus and tensile strength, while for the alloy after aging treatment, it contains β, a and to phases and exhibits significantly higher elastic modulus and tensile strength. With increasing of the aging temperature, the microstructure became coarser and the elastic modulus and tensile strength became lower. It is recommended that a Ti-27Nb-8Zr alloy with comparatively lower elastic modulus (85.5 GPa) and optimal comprehensive properties can be obtained by adopting following process: solution treatment at 800 ℃ for 1h and then quenched, aged at 500 ℃ for 12 h then air-cooled.