Aimed at the mechanical property improvement in the high pressure die casting (HPDC) process for the aluminium alloy, two sets of shot curves (the baseline and the optimized condition) are designed to study their influence on the distributions of the ultimate tensile strength (UTS) and the elongation (El) for the as-cast ASTM tensile samples. Difference in the as-cast microstructures and defects are characterized and compared accordingly. Following the experiments, a mathematical model for the entire HPDC process is established to study the characteristics of the melt flow, heat transfer, solidification and defects formation (entrapped gas, oxides, porosities) during the HPDC process with the two above-mentioned piston shot curves are analyzed. The results have shown that the UTS and the El are improved obviously with the optimized shot profile. And the mechanism for these changes are explained in detail. This work provides a novel approach for designing and optimization of metal casting process without conducting excessive experiments and it could be transferred and applied to various alloys systems and different casting processes.

为了改善铝合金在高压压铸（HPDC）工艺中的机械性能，设计了两组抛丸曲线（基线和优化条件）以研究它们对极限抗拉强度（UTS）分布的影响）和铸态ASTM拉伸样品的伸长率（El）。表征并比较了铸态微观结构和缺陷的差异。根据实验，建立了整个HPDC过程的数学模型，以研究上述两个活塞喷丸在HPDC过程中熔体流动，传热，凝固和缺陷形成（夹带的气体，氧化物，孔隙）的特征。分析曲线。结果表明通过优化的镜头配置，UTS和El明显得到了改善。并详细说明了这些更改的机制。这项工作为金属铸造工艺的设计和优化提供了一种新颖的方法，而无需进行过多的实验，它可以转移并应用于各种合金系统和不同的铸造工艺。