Al-Cu-Zn合金溶质分凝的热力学模型  

THERMODYNAMIC MODELS FOR THE SOLUTE PARTITIONING IN Al-Cu-Zn TERNARY ALLOYS

作　　者：陈福义[1] 介万奇[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《金属学报》2003年第6期597-600,共4页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划项目 G2000067202-1资助

摘　　要：提出了计算多元合金溶质分凝行为的热力学模型,分析了活度法和浓度法两种计算平衡分凝因数方法的异同,应用提出的模型系统地研究了Al-Cu-Zn合金的平衡分凝因数,计算表明,活度法和浓度法的计算结果接近,溶质Cu和Zn的平衡分凝因数在凝固温度范围内随温度增加下降10％左右,Zn和Cu任何一种溶质元素的浓度增加都会降低另一种元素的平衡分凝因数,同时研究了杂质元素对三元Al-Cu基合金中Cu的平衡分凝固数的影响。Solute partitioning is one of the complicated but important phenomena, which controlls segregations and morphologic evolution during the solidification of multi-component alloy. Two thermodynamic models, activity method and concentration method, were developed to calculate the equilibrium solute partition ratios of multi-component alloy, and their application methods were analyzed. Based on these models, the equilibrium solute partition ratios of Al-Cu-Zn alloy were calculated. It is found that the results obtained by the two models are close each other, and the partition ratio is slightly dependent on the temperature. Increasing of Zn concentration leads to decrease of the equilibrium partition ratio of Cu. The effect of impurities on the equilibrium partition ratio of Cu in Al-Cu-M alloy was analyzed and compared with experimental results.

关 键 词：Al—Cu—Zn合金 分凝因数 热力学模型 

分 类 号：TG111.3[金属学及工艺—物理冶金] O642.1[金属学及工艺—金属学]