Aluminum alloy material for electric car power battery tray and preparation method thereof

Abstract

The invention relates to the technical field of aluminum alloy machining, in particular to an aluminum alloy material for an electric car power battery tray and a preparation method thereof. The aluminum alloy material comprises, by mass, 1.00-1.18% of Mg, 0.82-1.00% of Si, 0.88-1.02% of Cu, 0.64-0.82% of Mn, 0.05-0.25% of Zr, less than or equal to 0.3% of Fe, less than or equal to 0.15% of othertotal impurities, and the balance Al. The aluminum alloy material provided by the invention is uniform in texture and fine in grain, has high strength, tensile strength, impact toughness, stress corrosion cracking resistance, weldability and other performance, the tensile strength is greater than 350 MPa, the exfoliation corrosion performance is not less than the grade EA, and the strength coefficient of a friction stirring welding head is greater than 85%. The aluminum alloy material is applied to the car power battery tray and can meet the requirements for light weight of cars.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to an aluminum alloy material used for an electric vehicle power battery tray and a preparation method thereof. Background technique [0002] Among automotive lightweight materials, alloy materials have the characteristics of light weight and easy recycling, and their comprehensive cost performance is higher than that of steel, magnesium, plastic, carbon fiber, etc., and they are the preferred materials for lightweight automobiles. my country is currently the largest automobile manufacturing and consuming country in the world, but our country is still relatively backward in the lightweight of automobiles. At present, the average aluminum consumption per car in my country is only 115 kg, which is lower than the global single-vehicle aluminum consumption of 169 kg. Compared with countries such as Japan and Japan, the gap is even bigger. Many well-known foreign automak...

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Problems solved by technology

[0003] The development of automobile lightweight has put forward higher and higher requirements for the comprehensive performance of aluminum alloy materials. At present, the Al-Mg-Si alloys represented by 6063, 6005, 6061 and other brands have excellent extrusion processing performance, but The strength is still low, and the fracture toughness, stress corrosion cracking resistance and welding performance are still slightly insufficient. Al-Zn-Mg and Al-Zn-Mg-Cu series high-strength aluminum alloys represented by 7005, 7050, 7075 and other grades , although it has the advantage of high strength, but when it is used in body anti-collision beams, power battery trays and other components, there are generally problems such as insufficient fracture toughness, high sensitivity to intergranular corrosion, and poor welding performance.

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