High-strength weldable aluminum alloy and preparation method thereof

Abstract

The invention belongs to the field of an aluminum alloy material and discloses high-strength weldable aluminum alloy. The high-strength weldable aluminum alloy comprises the following components: 0.4to 1.2 percent of Mg, 0.7 to 1.4 percent of Si, 0.2 to 0.7 percent of Mn, 0.05 to 0.2 percent of Cu, 0.1 to 0.5 percent of Zn, 0.4 to 0.6 percent of Fe, 0.05 to 0.15 percent of Cr, 0.1 to 0.3 percentof other alloy element and the balance of Al, wherein other alloy element comprises combination of Ni, V, Ti, Zr and rare earth element with the ratio of (1.2-1.4):(0.6-0.8):(2.4-2.6):(0.4-0.6):0.2; and the rare earth element comprises Ce, La and Er, and Ce account for more than 60 percent of the total amount of the rare earth element. Through improvement of the original formula, the aluminum alloy improves strength and mechanical property and can serve as aluminum alloy parts, such as an end plate and a tray, in a power battery of a new energy automobile.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials, and in particular relates to a high-strength weldable aluminum alloy and a preparation method thereof. Background technique [0002] The 6xxx series aluminum alloys are the most widely used and the largest output aluminum alloys. The existing 6xxx series aluminum alloys have been used in important industries such as aerospace, weaponry, transportation, and electric power. However, with the expansion of its application range, the strength, toughness, weldability and corrosion resistance of 6xxx series aluminum alloys have been severely challenged. [0003] The 6xxx series is an Al-Mg-Si alloy, which is an aluminum alloy that can be precipitated and strengthened, and the main strengthening phase is Mg 2 Si, however, currently the content of alloying elements in 6xxx series aluminum alloys is low, for example, the content of Mg is 0.3%-1.2%; the content of Si is 0.3%-1.7%, therefore, the str...

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Problems solved by technology

However, with the expansion of its application range, the strength, toughness, weldability and corrosion resistance of 6xxx series aluminum alloys have been severely challenged.

[0003] The 6xxx series is an Al-Mg-Si alloy, which is an aluminum alloy that can be precipitated and strengthened, and the main strengthening phase is Mg 2 Si, however, the content of alloying elements in 6xxx series aluminum

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