Abstract: A high-strength and high-toughness Al—Cu series cast aluminum alloy, a preparation method therefor, and the use of same in wheel hub manufacturing. Chemical components of the high-strength and high-toughness Al—Cu series cast aluminum alloy comprise the following elements in percentage by mass: 4.6-5.3% of Cu, 0.45-0.55% of Mn, 0.42-0.55% of Mg, 0.15-0.25% of Ti, 0.05-0.15% of Zr, and 0.003-0.011% of B; the chemical components of the high-strength and high-toughness Al—Cu series cast aluminum alloy further comprising Fe and Si in percentage by mass, 0.03<Fe?0.2%, the mass ratio of Fe:Si being (2-6):1, and the balance being Al and inevitable impurities. The high-strength and high-toughness Al—Cu series cast aluminum alloy has low cost, satisfies the market requirements on aluminum alloy parts such as vehicle wheel hubs, and therefore is of important significance in accelerating weight reduction of vehicles and achieving the objects of energy conservation and emission reduction.

Abstract: Aluminum alloy with preferred mechanical property and preferred electrical and thermal conductivity is provided by a manufacturing method. The aluminum alloy consists of Si about 0.33˜0.37 wt %, Mg about 0.45˜0.55 wt %, and Fe about 0.07˜0.15 wt %, and the rest weight of the aluminum alloy is Al. A ratio of Mg to a different between Al and one third Fe is ranged between 1.45˜1.75.