AL-SI ALLOY, PREPARATION METHOD FOR SAME, AND APPLICATIONS THEREOF

An Al-Si alloy, a preparation method for same, and applications thereof, related to the technical field of aluminum alloys. The Al-Si alloy, in terms of mass percent content, comprises Si 14-22%, Cu 2-5%, Mg 0.5-2.2%, Zr 0.15-0.25%, La 0.1-0.5%, Er 0.1-0.3%, Mn ≤ 0.2%, Fe ≤ 0.15%, and the remainder being Al and unavoidable impurities, where the content of each impurity among the unavoidable impurities is less than 0.01%. By adding trace amounts of Zr and compound rare earth elements La and Er to the alloy and, at the same time, controlling the contents of Si, Cu, and Mg in the alloy, the morphology of a Si phase is improved, crystals are refined, the alloy is structurally uniform and is provided with increased strength and improved wear resistance.