CAJ | 학술논문

在前人已经优化评估的Ti-Al-Cr-Mn四元热力学数据库的基础上，设计了一种新型α钛合金Ti-6Al-3Cr-1Mn，并利用分瓣式水冷铜坩埚成功制得了该合金。该合金在770℃下经轧机轧制成6 mm厚的板材，然后于750℃保温90 min进行真空退火热处理，出炉后置于空气中冷却。通过组织观察，发现无论是铸锭还是退火后的板材，室温下均为α型钛合金，与设计相符。室温力学性能试验表明，Ti-6Al-3Cr-1Mn合金的力学性能良好，平均屈服强度为894．9 MPa，抗拉强度为926．7 MPa，断后延伸率为15．2％。Ti-6 Al-3 Cr-1 Mn合金与典型的α型钛合金TA15相比，室温强度相当，但塑性更好，成本更低。Ti-6 Al-3 Cr-1Mn合金的自腐蚀电位为-0．21 V，自腐蚀电流密度为7．7×10-7A·cm-2，耐腐蚀性能良好。
재전인이경우화평고적Ti-Al-Cr-Mn사원열역학수거고적기출상，설계료일충신형α태합금Ti-6Al-3Cr-1Mn，병이용분판식수랭동감과성공제득료해합금。해합금재770℃하경알궤알제성6 mm후적판재，연후우750℃보온90 min진행진공퇴화열처리，출로후치우공기중냉각。통과조직관찰，발현무론시주정환시퇴화후적판재，실온하균위α형태합금，여설계상부。실온역학성능시험표명，Ti-6Al-3Cr-1Mn합금적역학성능량호，평균굴복강도위894．9 MPa，항랍강도위926．7 MPa，단후연신솔위15．2％。Ti-6 Al-3 Cr-1 Mn합금여전형적α형태합금TA15상비，실온강도상당，단소성경호，성본경저。Ti-6 Al-3 Cr-1Mn합금적자부식전위위-0．21 V，자부식전류밀도위7．7×10-7A·cm-2，내부식성능량호。
Based on Ti-Al-Cr-Mn quaternary thermodynamic database,a newαtitanium alloy Ti-6Al-3Cr-1Mn was designed and successfully prepared by the split-water-cooled copper crucible.Rolled the ingot at 770 ℃,the obtained 6 mm-thick sheet under-took the vacuum heat-treatment at 750 ℃ × 90 min.Microstructure indicated that the alloy mainly consists ofαphase for both as-cast and annealing status,which coincides with the theoretical expectation.Then,mechanical properties of the alloy are meas-ured at room temperature,and the alloy possesses good mechanical properties compared with conventionalα-type titanium alloy TA15.The average yield-strength is 894.9 MPa,tensile-strength is 926.7 MPa,and average elongation is 15.2%.Comparing with TA15,this alloy has competitive mechanical properties,better elongation and less cost at room temperature.The corrosion potential of the new alloy is -0.21 V and corrosion current density is 7.7×10-7 A·cm-2 ,which shows good corrosion resist-ance.