Al-Mg-Si aluminum alloy material, aluminum alloy plate, and preparation methods of Al-Mg-Si aluminum alloy material and aluminum alloy plate

Abstract

The invention discloses an Al-Mg-Si aluminum alloy material. The Al-Mg-Si aluminum alloy material comprises the following chemical elements in mass percentage: Mg of which the mass percentage is equal to or larger than 0.5% and equal to or smaller than 1.0%, Si of which the mass percentage is equal to or larger than 0.6% and equal to or smaller than 1.5%, Sn of which the mass percentage is equal to or larger than 0.02% and equal to or smaller than 0.2%, Mn of which the mass percentage is equal to or larger than 0.1% and equal to or smaller than 0.45%, Fe of which the mass percentage is larger than 0 and equal to or smaller than 0.4%, Ti of which the mass percentage is equal to or larger than 0.02% and equal to or smaller than 0.1%, Zn of which the mass percentage is equal to or smaller than 0.15%, Cr of which the mass percentage is equal to or smaller than 0.1%, and the balance of Al and other inevitable impurities; in addition, the requirement that the total mass percentage of the Mg and the Si is equal to or smaller than 2.0% is met. In addition, the invention further discloses an aluminum alloy plate made from the Al-Mg-Si aluminum alloy material, and a preparation method of the aluminum alloy plate. The aluminum alloy material disclosed by the invention not only has an excellent forming property, but also has a preferable bake hardening effect.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to an AlMgSi series aluminum alloy material and a corresponding manufacturing method. Background technique [0002] Automobile lightweight is one of the current development directions of automobiles, especially the application of aluminum alloy sheets for automobile body is developing rapidly, and has become the focus of the international automobile industry. As we all know, the outer panels of automobiles such as hood, doors, roof or trunk lid have high requirements on materials. On the one hand, in the forming process of large panels such as hoods and doors, it is necessary to ensure the shape and dimensional accuracy of the parts, as well as good hemming and no surface defects such as wrinkles that affect the appearance. On the other hand, automotive panels need to have excellent bake hardening ability, that is, artificial aging hardening of the formed cover during coating and bakin...

AI Technical Summary

Problems solved by technology

[0004] However, although the mechanical properties of the existing AlMgSi-based aluminum alloy sheets basically meet the requirements, their baking response rate is slow, and most of the baking hardening values ​​do not exceed 220 MPa.

In order to improve the baking response ability, the addition of Cu element is commonly used in the existing technology, but a large increase in Cu content will not only increase the cost, but also affect the corrosion resistance of the aluminum plate

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