Provided in the present invention are a high strength and
ductility casted aluminum-
silicon alloy, a manufacturing method for same, and applications thereof. The aluminum-
silicon alloy consists of the following components in terms of
mass percent: Si 7-8%, Mg 0.4-0.5%, Fe 0.1-0.2%, Ti 0.1-0.2%, Sr 0.01-0.02%, La 0.03-0.06%, Ce 0.02-0.04%, and the remainder is Al and unavoidable
elemental impurities. The manufacturing method comprises the
smelting of an aluminum-
silicon alloy liquid, refinement and modification, refining for gas removal and
impurity removal,
casting, and a solution
ageing treatment. The present invention, by optimizing the content of elemental Si and Mg, refining and modifying an α-Al
crystallite, a β-Fe iron-rich phase, and an eutectic Si phase, allows the α-Al dendritic
crystal to be converted into fine equiaxed crystallites, allows the
acicular and flaky β-Fe iron-rich phase and the eutectic Si phase to be converted into a fine granular or short rod form, and eliminates the hazards posed by the
acicular and flaky β-Fe iron-rich phase and the eutectic Si phase on the strength,
plasticity, and
fracture toughness of the aluminum-
silicon alloy. The casted aluminum-
silicon alloy of the present invention is provided with high strength, great
plasticity, and excellent
fracture toughness and is applicable in
casting various force-bearing structural parts, such as vehicular lightweight structural parts.