摘要
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。
Abstract Based on Miedema's binary system model for heat of formation and Kohler's ternary solution model for mixed enthalpy,activity coefficient of each component in Ti 6Al 4V alloy has been calculated and the behavior of volatilizing loss of Al element in this melt during ISM melting was studied systematically.The result obtained by experiment revealed that the volatilizing of Al element in melt is influenced by the boundary volatilizing reaction when the temperature of melt is lower than 2100 K and the pressure in vacuum chamber is 10 -3 mmHg,while the volatilizing of Al is influenced by both boundary volatilizing reaction and its diffusion in the boundary layer of the melt when the temperature of the melt exceeds 2100 K.Finally,the volatilizing loss of Al element under the conditions of various melt temperature and external pressure was calculated,which provided theoretical guide for the melting practice of Ti 6Al 4V alloy.
出处
《铸造》
CAS
CSCD
北大核心
1999年第2期14-18,共5页
Foundry
基金
国防基金
