Mg-Cu-La三元非晶合金形成范围的热力学预测

基于分析有利于合金非晶化的热力学因素，从非晶形成的热力学观点出发，综合应用Miedema理论和Toop模型，并考虑纯金属在不同温度下的自由能，在此基础上提出了一种定量预测三元非晶合金形成范围的方法：通过比较晶态的自由能和相应非晶态的自由能来确定成分范围．用该方法计算Mg—Cu—La三元合金系的非晶形成范围，并与已有的实验数据进行比较，发现二者符合得较好．该方法对于定量预测二元及三元甚至是多元合金系非晶形成范围将有一定的指导意义．

Thermodynamic Prediction for Forming Range of Amorphous Mg - Cu - La Alloy

On the basis of the thermodynamic analysis, thermodynamic factors which favor the amorphization of alloys are analyzed.By comparision of Gibbs free energy between the amorphous and crystalline state, the glass forming range of ternary alloys is proposed by using Miedema theory, Toop model and considering the influence of temperature on the free energy of pure metals. This approach is applied to predict the composition range of amorphous Mg-Cu-La alloys. It is found that the theoretical results are in good accordance with the experimental results. This approach can be used as a guide to predict the glass forming range of binary, ternary and even multi-component systems.