【摘要】 采用高真空非自耗电弧熔炼炉对在高纯氩气气氛中Ti-35Nb-2Zr-0.3O（质量分数,%）合金进行熔炼。运用金相显微镜、X射线衍射仪、透射电子显微镜、维氏硬度计和万能试验机对冷形变前后的合金材料进行显微组织分析和力学性能测试,探讨冷形变对合金组织与性能的影响。结果表明:Ti-35Nb-2Zr-0.3O合金具有多种塑性变形机制,主要包括应力诱发α"马氏体相变、位错滑移和形变孪晶。随着冷形变率的增加,合金的晶粒细化且位错密度增加,导致合金的抗拉强度和硬度增加。形变过程中α″马氏体的增多使合金的弹性模量略有增加。90%冷变形后的Ti-35Nb-2Zr-0.3O合金具有较低的弹性模量（56.2 GPa）,较高的抗拉强度（1260 MPa）和强度模量比(22.4×10^-3)等优异性能,比Ti-6Al-4V合金更适合作为生物医用材料。更多还原

【Abstract】 The Ti-35Nb-2Zr-0.3O（mass fraction, %） alloy was melted under a high-purity argon atmosphere in a high vacuum non-consumable arc melting furnace, followed by cold deformation. The effects of cold deformation process on microstructure and mechanical properties were investigated using the OM, XRD, TEM, Vicker hardness tester and universal material testing machine. Results indicated that the alloy showed multiple plastic deformation mechanisms, including stress-induced α" martensite（SIM α"） transformation, dislocation slipping and deformation twins. With the increase of cold deformation reduction, the tensile strength and hardness increased owing to the increase of dislocation density and grain refinement, and the elastic modulus slightly increased owing to the increase of SIM α" phase. The 90% cold deformed alloy exhibited a great potential to become a new candidate for biomedical applications since it possessed low elastic modulus（56.2 GPa）, high tensile strength（1260 MPa） and high strength-to-modulus ratio(22.4×10^-3), which are superior than those of Ti-6Al-4V alloy.更多还原