液态结构对Al-Cu熔体过剩自由能的影响  

EFFECT OF MELT STRUCTURE ON THE EXCESS GIBBS FREE ENERGY IN Al-Cu ALLOY MELT

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3期259-262,共4页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划资助项目G2000067202-1

摘　　要：通过分析Miediema模型和亚规则溶液模型在描述Al-Cu合金过剩自由能上的差异,提出了一个新的二元合金热力学模型该模型考虑了液态结构因素对二元合金热力学性质的影响.与实验测定的溶液过剩自由能进行的比较表明,该模型具有良好的实用性.使用该模型可以计算熔体中不同成分的有序原子团对Al-Cu二元合金热力学性质的影响.The proper analysis of the solidification charactertics of multi-component alloys is mainly dependent on the thermodynamic description of binary alloys. A new model is developed to calculate the excessive free energy in melt Al-Cu alloys and the influence of the chemical short range order in melt structure. Comparison with other theoretical models, such as Miediema model and sub-regular solution model, shows that the new model is more reasonable, and also agrees with the experimental results. The new model can been applied to calculate the thermodynamic property in Al-Cu alloys containing the different chemical short range orders.

关 键 词：金属溶液模型 过剩自由能 液态结构 

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]