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

小行星9421780 这项研究推进了最近由主要研究者制定的相图计算方法。 计算包括三元和四元体系，并将这些计算与凝固模型相结合，以预测凝固路径。 计算了铝-镁-锌-铜（Al-Mg-Zn-Cu）四元系相图，并对所选富铝合金的凝固路径进行了实验验证。 四元系相图的计算包括组成三元系Al-Cu-Zn、Cu-Mg-Zn和Al-Mg-Cu。 采用Schiel模型和修正的Schiel模型对富铝合金的凝固路径进行了计算，修正的Schiel模型考虑了固体中的反向扩散。 凝固实验着重于Al-Mg-Cu合金系富Al侧的几种合金。多组分合金系统的热力学和相平衡知识对于开发先进材料以及改进先进材料的加工和制造至关重要。***

9421780 Chang This research advances the methodology of phase diagram calculations recently formulated by the principal investigators. The calculations include ternary and quaternary systems and integrates these calculations with solidification models to predict the paths of solidification. The phase diagram of the quaternary system aluminum-magnesium-zinc-copper (Al-Mg-Zn-Cu) and the solidification paths of selected Al-rich alloys are to be calculated and verified by related experiments. Phase diagram calculations for the quaternary system includes the constituent ternaries, Al-Cu-Zn, Cu-Mg-Zn, and Al-Mg-Cu. Solidification path calculations are carried out for selected Al-rich alloys using the Schiel model and modified Schiel model, which includes back diffusion in the solid. The solidification experiments emphasize several alloys on the Al-rich side of the Al-Mg-Cu alloy system. %%% A knowledge of the thermodynamics and phase equilibria of multi-component alloy systems is vital in developing advanced materials and in improving the processing and manufacturing of advanced materials. ***