依据活度系数预测二元合金熔体的表面张力  

Estimation of the Surface Tension of Binary Liquid Alloys by Utilizing the Coefficient of Activity

作　　者：牛立斌[1] 许云华[1] 崔亚茹[1] 周志斌[1] 

机构地区：[1]西安建筑科技大学耐磨材料研究所,陕西西安710055

出　　处：《铸造技术》2007年第7期930-932,共3页Foundry Technology

摘　　要：提出了一种简便的方法,以液态合金的活度系数为桥梁,假设体相和表面相的活度系数与其相应的原子配位数有一定的对应关系,从已有的热力学数据出发,利用Miedema二元合金生成热模型,借用数学软件,先计算出液态合金各个组元在体相中的活度系数,再将活度系数代入Butler方程求得二元合金的表面张力,并以Fe-Cu、Fe-Ni、Cu-Ni三种二元体系为例进行了计算验证,其结果与已有文献中的实验值吻合较好。A simple method is put forward to estimate the surface tension of binary liquid alloys. Through the medium of the activity coefficients and a certainly relationship between the bulk phase and the surface phase, that is ,the activity coefficient of the element in binary liquid alloys is related with the atomic number of complex. According to the thermodynamics datum filed, utilizing the Miedema model which can well calculate the enthalpies of formation of liquid alloy and the two mathematic softwares, the activity coefficients of every element in bulk phase are calculated, then the surface tension can be work out by the equation of Butler. In the paper, three kinds of binary alloys Fe-Ou, Fe-Ni,Ou-Ni, respectively, were used as examples to test the reliability of this method, the results show that there is a good agreement between the calculated values and the documents values.

关 键 词：表面张力 二元合金 活度系数 

分 类 号：TG131[一般工业技术—材料科学与工程] TG111.3[金属学及工艺—合金]