摘要
生物医用β-Ti合金因具有低弹性模量和超弹性的特点而备受关注。亚稳定β-Ti合金的超弹性来源于应力诱发的β→α″马氏体转变及其逆转变。以分析Ti-Nb基和Ti-Mo基两合金体系为基础,对β-Ti合金的研究现状进行了归纳总结,阐述了合金元素添加对β相马氏体转变和超弹性的影响,指出提高超弹性的关键是通过提高β相的屈服强度和调整成分获得合适的Ms点,随后介绍了超弹性β-Ti合金经不同热处理后能够获得更高的超弹性回复,最后对生物医用β-Ti合金的发展进行了展望。
Biomedical β-Ti alloys have attracted much attention owning to their noticeable characteristic including low modulus and super elasticity. Super-elasticity in metastable β-Ti alloys is caused by a stress-induced β→α″ martensite transformation and the reverse transformation. The research progress ofβ-Ti alloys is summarized by analyzing Ti-Nb-based and Ti-Mo-based alloys. The influence of alloying elements on martensitic transformation and super-elasticity of β phase are elaborated. It is pointed out that the key of improving super-elasticity is increasing the yield strength of β phase and obtaining proper Ms points by adjusting composition. Improvement in super-elasticity of β-Ti alloys by heat treatment is introduced subsequently. Finally, the development of biomedical β-Ti alloys is prospected.
引文
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