冷形变对生物医用Ti-35Nb-2Zr-0.3O合金显微组织和性能的影响（英文）

发布时间：2018-05-11 13:17

本文选题：Ti-Nb-Zr-.O合金 + 冷变形　；参考：《Transactions of Nonferrous Metals Society of China》2017年07期

【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。
[Abstract]:Ti-35Nb-2Zr-0.3O (mass fraction) alloy was melted in a high vacuum non-consumable arc furnace in high purity argon atmosphere. The microstructure and mechanical properties of the alloy before and after cold deformation were analyzed by means of X-ray diffractometer, transmission electron microscope, Vickers hardness tester and universal tester, and the effect of cold deformation on the microstructure and properties of the alloy was discussed. The results show that there are many plastic deformation mechanisms in the W Ti-35Nb-2Zr-0.3O alloy, including stress induced 伪 "martensite transformation, dislocation slip and deformation twin." With the increase of cold deformation rate, the grain refinement and dislocation density increase, which leads to the increase of tensile strength and hardness of the alloy. With the increase of 伪 "martensite during deformation, the elastic modulus of the alloy slightly increased by .90% cold deformation. The Ti-35Nb-2Zr-0.3O alloy with lower elastic modulus (56.2 GPA), higher tensile strength (1260 MPA) and strength and modulus ratio (22.4 脳 10 ~ (-3), and so on, have excellent properties, such as low elastic modulus (56.2 GPA), high tensile strength (1260 MPA) and tensile modulus ratio (22.4 脳 10 ~ (-3). It is more suitable as biomedical material than Ti-6Al-4V alloy.
【作者单位】：东南大学江苏省先进金属材料重点实验室;
【分类号】：R318.08;TG146.23

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