热处理对Ti35Nb3．7Zr1．3Mo合金的组织与性能影响

摘要

依据钛合金相关设计理论设计了低弹性模量、中高强度、良好塑性的新型生物医用近β型Ti35Nb3．7Zr1．3Mo合金，研究了固溶温度和时效温度对合金组织和力学性能的影响。结果表明：随着固溶温度的升高，α相逐渐溶解，合金的强度和弹性模量尚未发生明显变化。在低温时效时析出脆性ω相；随着时效温度升高，逐渐析出α相，且α相逐渐粗化；合金的强度与弹性模量先升高，达到峰值后下降；延伸率先降低后升高。合金经750℃固溶和450℃时效后综合力学性能优良，可以满足生物植入材料力学性能的要求。%A new β-type alloy Ti35Nb3. 7Zr1. 3Mo for biomedical implant with low Young′s modulus, high tensile strength and good plasticity was designed based on related design theory of titanium alloy. The influence of solid solution and aging temperature on microstructures and mechanical properties were investigated. It was found that α phase was dissolved in β matrix gradually with the increasing of solution temperature and the strength and elastic modulus have no significant change. The ω phase precipitates when aged at low temperature, while α phase precipitates and becomes coarse gradually when the aging temperature increases. With the increasing of aging temperature, the strength and Young′s modulus of the alloy increase first to the peak and then decrease, while the elongation of the alloy decreases first and then increases. The alloy processed by 750 ℃ × 30 min solution treatment and 450 ℃ × 12 h aging possesses excellent integrated mechanical properties and can meet the requirement for the mechanical properties of implant materials.