Prediction of thermodynamic activities in binary iron-based alloys using two-point Pade approximants

被引：0
|
作者：
Stella, Eduardo [2 ]
Stella, Jorge [1 ]
机构：
[1] Univ Simon Bolivar, Dept Mat Sci, Caracas 1080, Venezuela
[2] Univ Simon Bolivar, Dept Phys, Caracas 1080, Venezuela
来源：
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2008年 / 99卷 / 09期
关键词：
Activities; Binary solutions; Pade approximants; Gibbs-Duhem; Iron-based alloys;
D O I：
10.3139/146.101724
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A method for predicting activities as a function of the concentration in liquid solutions for binary FeCo, FeCu, FeNi, FeMn and FePd systems using Pade approximants is presented. Pade approximants of orders 4/0 and 1/3 are proposed for the model using as input variables only the conditions from Henry's law at a given temperature. Results derived from the approximant 4/0 show good agreement with the experimental data in systems with moderate positive and negative deviations from the Raoultian behaviour. On the other hand, the approximant 1/3 shows a satisfactory agreement in the FeCu system which exhibits a high positive deviation from the Raoultian behaviour. A comparison with the results from a Redlich-Kister expansion using the same input conditions is discussed.
引用
收藏
页码：947 / 957
页数：11
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