A kind of high-strength weldable aluminum alloy and preparation method thereof

Abstract

The invention belongs to the field of aluminum alloy materials and discloses a high-strength weldable aluminum alloy. The high-strength weldable aluminum alloy includes the following components: 0.4-1.2% Mg, 0.7-1.4% Si, 0.2-0.7% Mn, 0.05-0.2% %Cu, 0.1‑0.5% Zn, 0.4‑0.6% Fe, 0.05‑0.15% Cr, 0.1‑0.3% other alloying elements, the balance is Al; other alloying elements include Ni, V, Ti, Zr, rare earth elements Combination, the ratio is 1.2-1.4: 0.6-0.8: 2.4-2.6: 0.4-0.6: 0.2; the rare earth elements include: Ce, La, Er, wherein Ce accounts for more than 60% of the total amount of rare earth elements. The aluminum alloy of the present invention improves the strength and mechanical properties through the improvement of the original formula, and can be used as aluminum alloy parts in the power battery of new energy vehicles, such as end plates, trays and the like.

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 alloys is low at present, such as the content of Mg is 0.3%-1.2%; the content of Si is 0.3%-1.7%, therefore, the alloy strength and hardness are low

Although the aluminum alloy of this invention has good welding performance and certain strength, its strength is not enough in some special fields, and it does not belong to high-strength aluminum alloy, so a high-strength weldable aluminum alloy is needed

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