High-strength and high-ductility aluminum alloy panel and manufacturing method thereof

Abstract

The invention discloses a high-strength and high-ductility aluminum alloy panel and a manufacturing method thereof. The aluminum alloy panel is prepared from, by mass, 0.8-1.5% of Mg, 0.8-1.5% of Si,1.2-1.5% of Cu, 0.1-0.5% of Mn, 0.05-0.5% of Fe, 0.05-0.2% of Zr, 0.01-0.15% of Ti, the balance Al and other inevitable impurities. By adopting the two-stage homogenization thermal treatment technology corresponding to the aluminum alloy ingredient system, the grain refining and dispersion reinforcing effect of alloy and the aging hardening rate in the stoving varnish or short-time artificial aging process are increased, and the number density and dispersion distribution of a precipitated phase are improved, so that the strength of a final aluminum alloy part is improved, and meanwhile the high plasticity is achieved.

Description

technical field [0001] The invention belongs to the field of manufacturing aluminum alloy plates and strips, and in particular relates to a high-strength and high-elongation aluminum alloy plate and a manufacturing method thereof, and is especially suitable for automotive structural parts and safety parts with lightweight requirements. Background technique [0002] In response to the calls of governments of various countries for energy saving and emission reduction of automobiles, the world's major automobile manufacturers have taken body weight reduction as an important task for automobile development. Aluminum alloy is considered to be the most effective lightweight material for automobiles due to its low density, good formability, impact energy absorption, corrosion resistance and recyclability. At present, aluminum alloy sheets are widely used in automotive panels such as hoods, trunk lids and doors. With the increasingly stringent fuel consumption regulations of govern...

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Problems solved by technology

However, due to its poor fatigue resistance and weldability, it has an obvious tendency of stress corrosion cracking, and its cost is high, it still takes time to apply it in automobiles.

5xxx series Al-Mg series aluminum alloys are non-strengthenable aluminum alloys by heat treatment. The strength is mainly improved by solid solution strengthening and work hardening. Since there is no aging strengthening effect, it is difficult to meet the strength requirements of automotive structural parts.

The aluminum alloy has a yield strength of ≥160MPa and a tensile strength of ≥280MPa after baking paint, which still does not meet the strength requirements of automotive structural parts

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