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以二元合金的Ｍｉｅｄｅｍａ生成热模型和以Ｋｏｈｌｅｒ建立的三元溶液混合焓模型为基础，计算了Ｔｉ６Ａｌ４Ｖ合金中各组元的活度系数，在此基础上系统研究了该合金的ＩＳＭ熔炼过程中Ａｌ元素的挥发损失行为。研究结果表明：在真空室压力为０１３３Ｐａ（１０－３ｍｍＨｇ）的条件下，当熔体温度低于２１００Ｋ时，Ａｌ元素的挥发受界面挥发反应控制；而当熔体温度高于２１００Ｋ时，则受界面挥发反应和液相边界层中的扩散双重控制。最后计算了不同外压和熔体温度条件下Ａｌ元素的挥发损失量，为实际熔炼过程提供了理论指导。
Based on the Miedema generated thermal model of binary alloy and the ternary solution mixed enthalpy model established by Kohler, the activity coefficients of each component in Ti6Al4V alloy were calculated. On the basis of this, Volatile Loss Behavior of Al Element During ISM Melting. The results show that the volatilization of Al element is controlled by the interface volatilization when the melt temperature is lower than 2100K under the pressure of 0133Pa (10-3mmHg) in vacuum chamber. When the melt temperature is higher than 2100K, Is controlled by the interface volatilization and the diffusion in the liquid boundary layer. Finally, the amount of Al element volatilization under different external pressures and melt temperatures was calculated, which provided theoretical guidance for the actual smelting process.