摘要
提出了由二元相图提取定温下无限稀活度系数的方法,分别在正规溶液和Richardson假设条件下,计算了31个二元液态合金体系两组元无限稀活度系数,并与相应的实验值比较,所获得的平均相对误差为:共晶体系为23.2%和20.7%;含固溶体体系为19.4%和18.3%;含化合物体系为39.5%和46.1%;分层体系为25.8%和14.3%.结果表明:由共晶相图、含固溶体相图提取无限稀活度系数,有效性较好,由含化合物相图提取无限稀活度系数有效性较差.引入Richardson假设后,对计算值的精度有所提高.研究表明,运用二元相图提取无限稀活度系数方法提取二元合金体系无限稀活度系数是可行的.
A new method for calculating the infinite dilute activity coefficients of components from binary alloy phase diagram at a fixed temperature is presented in this paper.The infinite dilute activity coefficients of two components of 31 binary liquid alloy systems are calculated under the conditions of Regular solutions and Richardsons assumption respectively.The average relative errors of two components between calculated values and experimental data are also calculated under these two different assumptions,for simple eutectic systems, systems with solid solution,systems involving two liquid phases and systems involving intermediate compounds. The results under the conditions of Regular solutions assumption are 23.2%,1 9.4%,25.8% and 39.5%, respectively,and the results under the conditions of Richardsons assumption are 20.7%,1 8.3%,1 4.3%and 46.1%,respectively.The results show that the method for calculating infinite dilute activity coefficients of two components from simple eutectic phase diagrams,phase diagrams with solid solutions and phase diagrams involving two liquid phases are quite efficient.But,for the phase diagrams involving intermediate compounds the effectiveness of method is relatively poor.The accuracy of the calculated values is improved a little after the introduction of Richardsons assumption.It shows that it is feasible to obtain the infinite dilute activity coefficients in alloy systems by the method of calculating infinite dilute activity coefficients from binary phase diagrams.
出处
《昆明理工大学学报（自然科学版）》
CAS
北大核心
2014年第4期1-7,54,共8页
Journal of Kunming University of Science and Technology(Natural Science)
基金
Supported by the National Science Foundation of China(No.51090381)
关键词
二元液态合金
相图
无限稀活度系数
binary liquid alloy
phase diagram
infinite dilute activity coefficient
