6000 series aluminum alloy material with high natural aging stability, aluminum alloy plate and preparing method of aluminum alloy plate

Abstract

The invention discloses a 6000 series aluminum alloy material with high natural aging stability. The chemical elements of the material comprise, by mass, larger than or equal to 0.2% but smaller than or equal to 0.8% of Mg, larger than or equal to 0.8% but smaller than or equal to 1.5% of Si, larger than or equal to 0.07% but smaller than or equal to 0.25% of Sn, larger than 0 but smaller than or equal to 0.05% of Cu, larger than or equal to 0.02% but smaller than or equal to 0.2% of Mn, larger than 0 but smaller than or equal to 0.5% of Fe, larger than or equal to 0.05% but smaller than or equal to 0.15% of Ti, smaller than or equal to 0.2% of Zn, smaller than or equal to 0.1% of Cr and the balance Al and other inevitable impurities. Correspondingly, the invention further includes an aluminum alloy plate prepared through the 6000 series aluminum alloy material with high natural aging stability and a preparing method of the aluminum alloy plate. The aluminum alloy material and the aluminum alloy plate have good natural aging stability on the basis that the forming performance and the bake hardening performance are not reduced.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a 6000 series aluminum alloy material and a corresponding manufacturing method. Background technique [0002] In recent years, in order to improve the fuel efficiency of automobiles, more and more automobile materials use lightweight aluminum alloys instead of steel materials, especially 6000 series aluminum alloys, which are particularly popular. This is because the 6000-series aluminum alloy sheet ensures formability with the help of low yield strength during stamping and hemming processing, and the formed sheet is age-hardened during relatively low-temperature artificial aging treatment such as painting and baking, thereby improving Increased yield strength and improved dent resistance. [0003] However, the 6000-series aluminum alloy sheet will undergo natural aging after solution treatment, and magnesium and silicon atoms will segregate at room temperature, resulting in an incr...

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Problems solved by technology

[0003] However, the 6000 series aluminum alloy sheet will undergo natural aging after solution treatment, and magnesium and silicon atoms will segregate at room temperature, resulting in an increase in yield strength

Especially in the process of transportation and storage of aluminum alloy plates, as time goes by, the mechanical properties of aluminum alloy plates are unstable, and often the yield strength and tensile strength both increase, while the elongation decreases significantly, resulting in aging aluminum alloys. The alloy plate rebounds seriously during stamping, and even cracks during edge wrapping, which seriously affects the production quality

Therefore, the natural aging problem has seriously affected the wide application of 6000 series aluminum alloy plates.

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