This study is aimed towards process design for semi-solid slurry generation of Al–7Si–0.3Mg alloy using cooling slope as a slurry maker, and subsequent isothermal holding to promote globularization of slurry microstructure. The study primarily reports globularization mechanism of cooling slope processed semi-solid slurry of the alloy, and efforts are directed to establish process control by investigating the effect of coarsening during isothermal holding on the shape, size and distribution of primary Al grains. As an outcome of this study, we propose a modified Lifshitz–Slyozov Wagner equation to quantify the effect of coarsening mechanisms prevailing during isothermal holding of the said alloy slurry. The evolution of primary phase morphology due to addition of grain refiner has also been studied and ideal processing condition is identified for the end goal of component development through rheo pressure die casting route.

这项研究的目的是利用冷却斜率作为制浆机，对Al-7Si-0.3Mg合金半固态制浆工艺的设计，以及随后的等温保持，以促进浆体微球化。该研究主要报道了冷却斜面处理的半固态浆料的球化机理，并通过研究等温保持过程中的粗化对原始Al晶粒的形状，尺寸和分布的影响，致力于建立工艺控制。作为这项研究的结果，我们提出了一个改进的Lifshitz-Slyozov Wagner方程，以量化所述合金浆料在等温保持过程中普遍存在的粗化机理的影响。