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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。
The high-vacuum non-consumable arc melting furnace is used to smelt the Ti-35Nb-2Zr-0.3O (mass fraction,%) alloy in a high purity argon atmosphere. The microstructure and mechanical properties of the alloy before and after cold deformation were investigated by metallographic microscope, X-ray diffraction, transmission electron microscopy, Vickers hardness tester and universal testing machine to investigate the effect of cold deformation on the microstructure and properties of the alloy. The results show that Ti-35Nb-2Zr-0.3O alloy has a variety of plastic deformation mechanisms, including stress-induced martensite transformation, dislocation slip and deformation twinning. With the increase of cold deformation rate, The grain refinement and the increase of dislocation density lead to the increase of the tensile strength and hardness of the alloy.The increase of α ”martensite in the deformation process makes the elastic modulus of the alloy slightly increase. The 90% cold deformed Ti-35Nb-2Zr-0.3O alloy has lower elastic modulus (56.2 GPa), higher tensile strength (1260 MPa) and strength modulus ratio (22.4 × 10 -3 )) And other excellent performance, more suitable than Ti-6Al-4V alloy as a biomedical material.