High-strength high-toughness impact-resistant energy-absorbing Al-Mg-Si alloy

The invention belongs to the technical field of aluminum alloy materials, and particularly relates to a high-strength high-toughness impact-resistant energy-absorbing Al-Mg-Si alloy. The Al-Mg-Si alloy is prepared from the components in percentage by mass: 0.40% to 1.00% of Mg, 0.50% to 0.90% of Si, smaller than or equal to 0.60% of Mn, smaller than or equal to 0.30% of Cr, smaller than or equal to 0.25% of Fe and 96.8% to 99.1% of Al, Sifree = Si-0.3 * (Mn + Fe + Cr), the mass ratio of the Mg to the Sifree ranges from 0.72 to 1.40, and the mass percentage of Mg + 2Sifree ranges from 1.40% to 2.40%. The aluminum alloy not only has excellent conventional mechanical properties, but also has good bending toughness and outstanding crushing and impact-resistant energy-absorbing properties. 本发明属于铝合金材料技术领域，具体涉及一种高强高韧抗冲击吸能Al-Mg-Si合金。本发明Al-Mg-Si合金按质量百分比计包括Mg0.40～1.00％、Si0.50～0.90％、Mn≤0.60％、Cr≤0.30％、Fe≤0.25％、Al 96.8～99.1％，其中，Sifree＝Si-0.3×(Mn+Fe+Cr)，Mg/Sifree质量比为0.72-1.40，且Mg+2Sifree质量百分比为1.40％～2.40％。本发明提供的铝合金不仅具有优异的常规