Molecular Dynamics Simulations of Solidification in Al-Si Alloys

Al-Si是最受欢迎的铝铸造合金，用于生产航空航天和汽车应用的轻质部件。多年来，人们已经知道，少量添加某些杂质到Al-Si中会导致强度和韧性的显着改善，但杂质在提高机械性能方面所起的确切作用尚未完全了解。在这项工作中，我们将利用计算机模拟研究，第一次，原子水平的过程发生在固-液界面在凝固过程中的铝硅合金。了解选择杂质添加物如何导致铸造产品结构的变化，将为改进合金的设计铺平道路。

Al-Si is the most popular Al cast alloy for the production of lightweight components for aerospace and automotive applications. It has been known for many years that small additions of certain impurities to Al-Si leads to significant improvements in strength and toughness, yet the precise role played by the impurities in enhancing mechanical properties is not completely understood. In this work we will utilize computer simulations to study, for the first time, the atomic level processes taking place at the solid-liquid interface during solidification in Al-Si alloys. An understanding of how select impurity additions lead to changes in the structure of the cast product will pave the way for the design of improved alloys.