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以海绵钛、海绵锆和高纯二氧化钛为原料,采用真空非自耗电弧熔炼法制备了Ti-4Zr-x O(x=0,0.05,0.10,0.15,0.20)合金,通过差示扫描量热仪(DSC)、X射线衍射仪(XRD)、万能试验机、金相光学显微镜(OM)、显微硬度计、扫描电镜(SEM)等系统研究了氧含量对Ti-4Zr-x O合金相变温度、晶体结构、显微组织和力学性能的影响。结果表明:随着氧含量的增加,Ti-4Zr-x O合金的β转变温度(Tβ)逐渐升高,由875?C变为915?C;不同成分合金的晶体结构均为单一的密排六方α相,晶格常数随着氧含量的增加逐渐增大;合金室温组织为典型的网篮组织,其中α相形貌随氧含量的增加由片状逐渐过渡到针状,且长宽比不断增大,表现出形成针状马氏体的趋势;合金的力学性能呈现出固溶强化与细晶强化共同作用的特征:随着氧含量的增加,Ti-4Zr-x O合金的抗拉强度和屈服强度显著提高,但塑性有所下降,显微硬度的变化规律与强度保持一致,其中Ti-4Zr-0.15O合金表现出最好的综合力学性能:抗拉强度、屈服强度和断后伸长率分别为658,576 MPa和20.2%。
Ti-4Zr-x O (x = 0,0.05,0.10,0.15,0.20) alloys were prepared by vacuum non-consumable arc melting method using sponge titanium, sponge zirconium and high-purity titanium dioxide as raw materials, The effects of oxygen content on the mechanical properties of Ti-4Zr-xO alloy (ie, Ti-4Zr-xO alloy) were studied by means of DSC, XRD, universal testing machine, OM, microhardness tester and SEM. Phase transition temperature, crystal structure, microstructure and mechanical properties. The results show that the β transformation temperature (Tβ) of Ti-4Zr-x O alloy gradually increases from 875? C to 915? C with the increase of oxygen content. The crystal structures of the alloys with different compositions are single close-packed The hexagonal α phase and the lattice constant increase with the increase of oxygen content. The room temperature microstructure of the alloy is a typical basket structure. The morphology of α phase transitions from sheet to acicular with the increase of oxygen content, and the aspect ratio Increasing continuously and showing the tendency of forming acicular martensite. The mechanical properties of the alloy show the synergistic effect of solid solution strengthening and fine grain strengthening. With the increase of oxygen content, the tensile strength of Ti-4Zr-xO alloy Ti-4Zr-0.15O alloy showed the best mechanical properties: tensile strength, yield strength and elongation after fracture, the tensile strength and yield strength increased significantly, but the plasticity decreased and the variation law of microhardness was consistent with the strength. The length rates were 658,576 MPa and 20.2% respectively.