本发明公开了一种汽车结构件用高强度、高韧性压铸铝合金及其制备方法以及应用。一种汽车结构件用高强度、高韧性压铸铝合金，组分包括：Si8 .0%‑12 .0%、Mn0 .4%‑1 .2%、Mg0 .1%‑0 .6%、Sr0 .01%‑0 .2%，Fe0 .005%‑0 .25%，0.005%‑0 .2%的Sc，余量为Al和不可避免的微量杂质，其中，微量杂质中的单个元素含量≤0 .1%，微量杂质总量≤0 .3%，其应用于汽车受力结构件，包括副车架、减震器支座。能够在较低的成本下，得到比传统的铝合金压铸材料以及主流Silafont36铝合金更为优异的力学性能，其屈服强度、抗拉强度、伸长率均表现优异，利于汽车工业以较低成本获得较高性能，利于汽车的轻量化。

The invention discloses a high-strength and high-toughness die-cast aluminum alloy for automobile structural parts, and a preparation method and application thereof. A high-strength, high-toughness die-casting aluminum alloy for automobile structural parts, the composition includes: Si8.0%-12.0%, Mn0.4%-1.2%, Mg0.1%-0.6%, Sr0 .01%-0.2%, Fe0.005%-0.25%, 0.005%-0.2% Sc, the balance is Al and inevitable trace impurities, of which the content of a single element in the trace impurities is ≤ 0.1%, the total amount of trace impurities ≤ 0.3%, which is used in automobile stressed structural parts, including sub-frames and shock absorber bearings. It can obtain better mechanical properties than traditional aluminum alloy die-casting materials and mainstream Silafont36 aluminum alloy at a lower cost, and its yield strength, tensile strength, and elongation are excellent, which is beneficial to the automotive industry at a lower cost. Obtain higher performance, which is conducive to the lightweight of the car.