[China Aluminum Industry Network] Adds copper to aluminum alloys based on aluminum-zinc-magnesium.
The superhard aluminum alloy has an intensity of 784N/mm2, but has poor heat and corrosion resistance, is sensitive to iron, and has poor stress corrosion resistance. The proportion of zinc and magnesium in the alloy can be appropriately controlled, and copper, manganese, and other elements can be further added. Alloy strength, improved plasticity and stress corrosion resistance, industrial use of high room temperature mechanical properties, generally σb is 490 ~ 690MPa pressure processing of aluminum alloys. Also known as high strength aluminum alloy. Mainly Al-Zn-Mg-Cu alloys. The ratio of zinc and magnesium content and the sum of zinc, magnesium and copper content are different, and the performance of the alloy is also different. The ratio of zinc and magnesium increases, the heat treatment effect of the alloy increases, and the strength increases, but the stress corrosion sensitivity increases. When the total content of zinc, magnesium and copper is more than 9% (mass), the alloy has higher tensile strength. The ingot is melted and then processed into a material by pressure. It is used to produce various forgings and die forgings, making aircraft skins, screws, load-bearing components, beam girders, bulkheads, and ribs.
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