(西北有色金属研究院，西安 710016)
摘 要: 研究Ti3Zr2Sn3Mo25Nb医用钛合金中相变演化过程和亚稳相对合金强度和弹性模量的影响规律。结果表明：Ti3Zr2Sn3Mo25Nb合金中相的演化过程为β→ω→α″→α，其中亚稳ω相及α″相的尺寸、数量及分布对合金强度、弹性模量及塑性的影响显著。ω相的尺寸越小，数量越多，分布越均匀，这有利于提高合金强度，降低塑性和弹性模量；通过控制亚稳ω相及α″相的尺寸、数量和分布，可以在一定范围里调整Ti3Zr2Sn3Mo25Nb合金的力学性能变化，从而得到更好的生物力学性能匹配。
关键字: 钛合金；相变；强度；弹性模量
（Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The phase transformation and the effect of metastable phase on the strength and elastic modulus of the Ti3Zr2Sn3Mo25Nb alloy were investigated. The results indicate that, the evolution of phase transformation is β→ω→α″→α in order. The grain size, amount and distribution of metastable ω phase and α″ phase have significant effect on the strength, elastic modulus and plasticity of the alloy. The smaller the size, the more the quantity and the more equally the distribution of the ω phase, which are of benefit to increasing the strength and decreasing the plasticity and modulus. The mechanical properties of Ti3Zr2Sn3Mo25Nb alloy can be adjusted by controlling the grain size, the amount and the distribution of the ω phase and α″ phase for better biomechanical compatibility.
Key words: Ti alloy; phase transformation; strength; elastic modulus
