【摘要】：以海綿鈦、海綿鋯和高純二氧化鈦為原料,采用真空非自耗電弧熔煉法制備了Ti-4Zr-xO(x=0,0.05,0.10,0.15,0.20)合金,通過差示掃描量熱儀(DSC)、X射線衍射儀(XRD)、萬能試驗機、金相光學顯微鏡(OM)、顯微硬度計、掃描電鏡(SEM)等系統(tǒng)研究了氧含量對Ti-4Zr-xO合金相變溫度、晶體結(jié)構(gòu)、顯微組織和力學性能的影響。結(jié)果表明:隨著氧含量的增加,Ti-4Zr-xO合金的β轉(zhuǎn)變溫度(Tβ)逐漸升高,由875℃變?yōu)?15℃;不同成分合金的晶體結(jié)構(gòu)均為單一的密排六方α相,晶格常數(shù)隨著氧含量的增加逐漸增大;合金室溫組織為典型的網(wǎng)籃組織,其中α相形貌隨氧含量的增加由片狀逐漸過渡到針狀,且長寬比不斷增大,表現(xiàn)出形成針狀馬氏體的趨勢;合金的力學性能呈現(xiàn)出固溶強化與細晶強化共同作用的特征:隨著氧含量的增加,Ti-4Zr-xO合金的抗拉強度和屈服強度顯著提高,但塑性有所下降,顯微硬度的變化規(guī)律與強度保持一致,其中Ti-4Zr-0.15O合金表現(xiàn)出最好的綜合力學性能:抗拉強度、屈服強度和斷后伸長率分別為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，

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