High-energy-absorptivity aluminum alloy for automobile bodies

Abstract

The invention relates to a high-energy-absorptivity aluminum alloy for automobile bodies, which comprises the following components in percentage by weight: 0.56%-0.64% of Mg, 0.42%-0.50% of Si, 0.17%-0.19% of Cu, 0.20%-0.22% of Fe, 0.028%-0.032% of Mn, 0.028%-0.032% of Cr, 0.028%-0.032% of Zn, 0.29%-0.31% of Ti, 0.29%-0.31% of Zr and the balance of Al. The preparation method comprises the following steps: preparing components according to weight percents, melting by heating to 740-750 DEG C, cooling, standing,, refining, and casting into a 250-300 DEG C iron mold; and carrying out homogenizing treatment on the cast ingot at 560 DEG C for 9 hours, quickly cooling with water, heating, extruding, carrying out water or fog quenching, and carrying out artificial aging at 180 DEG C. The invention has the advantages of reasonable component proportion, simple operating technique and favorable hot extrusion formability.

Description

technical field [0001] The invention relates to an aluminum-magnesium-silicon-aluminum alloy, in particular to a new Al-Mg-Si aluminum alloy containing elements Ti and Zr, which is suitable for structural materials of typical key safety components such as automobile anti-collision beams and energy-absorbing boxes. Background technique [0002] Lightweight is considered to be the most effective way to achieve sustainable development of the transportation industry. Al-Mg-Si alloy has high specific strength, high specific stiffness, good welding performance, good recyclability, and is an ideal material for automobile lightweight. Among the existing conventional commercial Al-Mg-Si alloys, the 6061 aluminum alloy has higher strength and good hot extrusion formability, and has application prospects as an aluminum alloy for vehicle body. However, its ductility is poor, the deformation and wrinkles are irregular during high-speed impact, the crack resistance is poor, and the energ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is, aiming at the defects of existing conventional commercial Al-Mg-Si alloys with poor resistance to crushing and cracking, propose a kind of alloy with reasonable component distribution ratio, easy processing and manufacturing, simple operation technology, and the use of Ti and Zr elements High energy-absorbing aluminum alloy and its preparation method for improving the microstructure of aluminum alloy and improving its comprehensive mechanical properties by alloying

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