氧含量对Ti-4Zr-xO合金组织与力学性能的影响
发布时间：2019-03-29 12:09
【摘要】：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-xO(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-xO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-xO合金的β转变温度(Tβ)逐渐升高,由875℃变为915℃;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-xO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%。
[Abstract]:Ti-4Zr-xO (x 0.05,0.05,0.10,0.15,0.20) alloys were prepared by vacuum non-consumable arc melting method using sponge titanium, zirconium sponge and high purity titanium dioxide as raw materials. Differential scanning calorimetry (DSC),) X-ray diffractometer (XRD),) was used to prepare the alloy. The effects of oxygen content on the phase transition temperature, crystal structure, microstructure and mechanical properties of Ti-4Zr-xO alloy were systematically studied by means of universal tester, metallographic optical microscope (OM), microhardness tester and scanning electron microscopy (SEM). The results show that with the increase of oxygen content, the 尾 transition temperature (T 尾) of Ti-4Zr-xO alloy increases gradually from 875 鈩，
本文编号：2449529
[Abstract]:Ti-4Zr-xO (x 0.05,0.05,0.10,0.15,0.20) alloys were prepared by vacuum non-consumable arc melting method using sponge titanium, zirconium sponge and high purity titanium dioxide as raw materials. Differential scanning calorimetry (DSC),) X-ray diffractometer (XRD),) was used to prepare the alloy. The effects of oxygen content on the phase transition temperature, crystal structure, microstructure and mechanical properties of Ti-4Zr-xO alloy were systematically studied by means of universal tester, metallographic optical microscope (OM), microhardness tester and scanning electron microscopy (SEM). The results show that with the increase of oxygen content, the 尾 transition temperature (T 尾) of Ti-4Zr-xO alloy increases gradually from 875 鈩，
本文编号：2449529
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