Phase Equilibria, Thermodynamics and Related Studies of Multi-Component Alloy Systems

该提案研究了三种三元铝合金和一种 四元铝合金系统。 热力学建模和相位 图计算与凝固建模相结合， 确定固化路径。 研究关注的合金 是Al-Mg-Cu、Al-Mg-Zn、Al-Zn-Cu和Al-Mg-Cu的富铝合金。 镁锌铜 该方法结合了热力学建模和 相平衡的实验测量。 一种改进的席尔 采用模型，该模型在确定 定向凝固的结果 实验结果与计算结果进行了比较， 模型 %%% 介绍了多组分体系的热力学和相平衡， 成分合金对于新合金的开发至关重要。 这 研究扩展了对模型的基本理解 铝合金系统，也具有商业意义。

This proposal examines three ternary aluminum alloys and one quartenary aluminum alloy system. Thermodynamic modeling and phase diagram calculations are coupled to solidification modeling to determine paths of solidification. Alloys of interest to the study are aluminum-rich alloys of Al-Mg-Cu, Al-Mg-Zn, Al-Zn-Cu, and Al- Mg-Zn-Cu. The approach combines thermodynamic modeling and experimental measurements of phase equilibria. A modified Schiel model is employed that accounts for back diffusion in determining the solidification path. Results from directional solidification experiments are compared with the calculations to improve the models. %%% A knowledge of the thermodynamics and phase equilibria of multi- component alloys is vital to the development of new alloys. This research expands basic understanding in this field for model aluminum alloys systems that also have commercial significance.