High-strength and high-toughness aluminum alloy bar for vehicles and preparation method thereof

The invention provides a high-strength and high-toughness aluminum alloy bar for a vehicle. The aluminum alloy bar comprises the following components in percentage by weight: 0.95-1.1% of Si; 0.1 to 0.2 percent of Fe; 0.4 to 0.5 percent of Cu; mn: 0.45 to 0.6%; 0.1 to 0.3 percent of Cr; 0.1 to 0.3 percent of Zn; 0.02 to 0.12 percent of Ti; 1% to 2% of composite SiC-Al2O3 porous balls; and the balance of aluminum. Wherein the composite SiC-Al2O3 porous ball is a hollow ball compositely coated by SiC and Al2O3, the outer layer of the hollow ball is SiC, the inner layer of the hollow ball is Al2O3, both SiC and Al2O3 are of a porous structure, and the aperture of SiC is smaller than that of Al2O3. According to the high-strength and high-toughness aluminum alloy bar for the vehicle, the composite SiC-Al2O3 porous balls serve as a modified filling agent, and the impact toughness of the bar is improved. 本发明提供了一种高强高韧车用铝合金棒材，所述铝合金棒材包括重量百分比的成分：Si：0.95-1.1％；Fe：0.1-0.2％；Cu：0.4-0.5％；Mn：0.45-0.6％；Cr：0.1-0.3％；Zn：0.1-0.3％；T