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真空熔炼的目的是避免间隙元素对ＴｉＡｌ金属间化合物的污染。但在真空下，由于钛铝合金熔体中铝的挥发损失将影响金属间化合物成分的准确度。作者利用计算得到的钛铝合金中钛、铝的活度系数，计算了钛铝合金熔体中钛、铝元素的挥发损失速率。结果表明，２０００Ｋ时，Ｔｉ４８ａｔ％Ａｌ熔体中铝的挥发速率是钛挥发速率的５０倍左右，即铝优先挥发。２０００Ｋ时，Ｔｉ４８ａｔ％Ａｌ在真空下保持３０分钟，铝的自由挥发将使铝含量由４８ａｔ％降至２６ａｔ％，与实验室试验结果基本一致。
The purpose of vacuum melting is to avoid interstitial element contamination of TiAl intermetallics. However, under vacuum, the loss of aluminum in the titanium-aluminum alloy melt will affect the accuracy of the intermetallic composition. Based on the calculated activity coefficients of Ti and Al in Ti-Al alloy, the authors calculated the volatilization loss of Ti and Al in Ti-Al alloy melt. The results show that the volatilization rate of aluminum in Ti48at% Al melt is about 50 times of that of titanium at 2000K, that is, the aluminum is preferentially volatilized. 2000K, Ti 48at% Al under vacuum for 30 minutes, the free aluminum will reduce the aluminum content from 48at% to 26at%, and the results of laboratory tests are basically the same.