High-strength 7-series aluminum alloy for automobile anti-collision beam and automobile anti-collision beam

Abstract

The invention discloses a high-strength 7-series aluminum alloy for an automobile anti-collision beam and the automobile anti-collision beam. The formation of ZnMg natural aging atomic clusters in the natural aging process of the 7-series aluminum alloy is effectively inhibited by adjusting aluminum bar alloy components and a heat treatment process. Natural aging clusters can hinder dislocation movement to cause strength increase, and meanwhile, part of strengthening phases can be slowly separated out to cause strength increase; and therefore, through inhibition, the hardness of the 7-series aluminum alloy in the natural aging process can be increased very slowly, the natural aging speed of the 7-series aluminum alloy is reduced, the parking effect is reduced, the situation that the hardness of the material is rapidly increased before aging is avoided, and meanwhile it can be guaranteed that the material reaches enough strength after aging. The formula of the adjusted alloy comprises less than or equal to 0.05% of Si, less than or equal to 0.15% of Fe, 0.2%-0.3% of Cu, 0.15%-0.20% of Mn, 1.4%-1.5% of Mg, less than or equal to 0.05% of Cr, 6.0%-6.3% of Zn, 0.15%-0.20% of Zr, 0.10%-0.15% of Sn, 0.05%-0.10% of In, 0.01%-0.03% of Ti, less than or equal to 0.05% of single impurities, less than or equal to 0.15% of total impurities and the balance Al.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing for automobiles, in particular to a high-strength 7-series aluminum alloy for automobile anti-collision beams and the automobile anti-collision beam. Background technique [0002] Because aluminum alloy has the characteristics of light weight (1 / 3 of steel), no rust, no corrosion, and easy recycling. At the same time, aluminum can increase its strength through work hardening or heat treatment, thereby achieving a high strength-to-weight ratio; aluminum alloy processing performance Good, suitable for different production processes such as casting, extrusion, stamping, forging and machining; aluminum alloys can also be strengthened to varying degrees by adding different alloying elements and through heat treatment processes; the surface of aluminum alloys is easy to form a dense oxide film and Good corrosion resistance; aluminum alloy also has good electrical and thermal conductivi...

AI Technical Summary

Problems solved by technology

[0005] However, it is also because of the high strength of the 7-series aluminum alloy that the natural aging is fast. If it is parked for more than a certain period of time, it will cause problems with the curvature of the bending deformation, and it may even be impossible to bend or crack when it is bent, which seriously limits the on-site operation.