合金元素、加工与热处理对新型近β型钛合金TiZrMoNb力学性能的影响及微观分析

Effects of Alloy Elements, Processing and Heat Treatment on Mechanical Properties of a Near β Type Biomedical Titanium Alloy TiZrMoNb and Microstructure Analysis

摘要:

系统研究了不同合金添加元素(Mo、Zr、Nb)、加工及热处理对近β型医用钛合金力学性能和显微组织的影响规律，讨论保持医用钛合金生物力学相容性匹配的影响因素和方法。研究发现：TiNbZrMo合金中增加Zr、Mo元素含量使合金强化，而增加Mo、Nb元素含量和热加工率利于降低弹性模量。经过固溶处理后强度和弹性模量降低，而时效处理后合金产生弥散强化和细晶强化使强度和弹性模量提高。新合金冷热加工性能好，无明显各向异性，经过适当热处理可以达到高强度、低弹性模量和优良的塑韧性、疲劳性能综合匹配

Abstract:

The influencing rule of alloy elements (Mo, Zr, Nb), processing and heat treatment on the microstructure and mechanical properties of a near β type biomedical titanium alloy TiZrMoNb (TLE) were investigated systematically; the influential factors on biomechanical compatibility matching of the TLE alloy and how to keep it were discussed. The results show that increasing the contents of Zr and Mo can strengthen the alloy, whereas increasing the contents of Mo and Nb and larger hot working rate are helpful to decrease the elastic modulus. The hot-rolled alloy after solid solution treatment possesses lower strength and elastic modulus; while for the above-mentioned alloy with another aging treatment, the strength and elastic modulus are increased, due to dispersive strengthening and fine grain strengthening. The prepared alloy possesses better cold and hot wrought properties without obvious anisotropy, and higher strength, lower elastic modulus and good comprehensive matching of ductility and toughness and fatigue resistance can be obtained after adequate heat treatment