Preparation method of novel particle-reinforced 7XXX aluminum alloy thin strip

Abstract

The invention relates to a preparation method of a particle-reinforced novel 7XXX aluminum alloy thin strip, which comprises the following steps of: 1) smelting according to the following chemical components in percentage by weight: 4.8 to 6.3 percent of Zn, 1.6 to 2.5 percent of Mg, 1.6 to 2.5 percent of Cu, 0.1 to 0.15 percent of Zr and the balance of Al and other inevitable impurities; the single impurity content is less than or equal to 0.1%, and the total impurity content is less than or equal to 0.2 (2) nano-particle enhancement; 3) continuous casting; 4) cooling; 5) primary hot rolling; (6) cooling and secondary hot rolling; (7) coiling; and 8) post-processing. According to the preparation method, the 7XXX aluminum alloy thin strip is prepared by combining nanoparticle reinforcement with a double-roller thin strip continuous casting process, and compared with an existing 7XXX aluminum alloy, the strength of the obtained aluminum alloy thin strip is higher than 20%, and the ductility is higher than 30%; and compared with a steel plate, the weight can be easily reduced by more than 40%.

Description

technical field [0001] The invention relates to the field of aluminum alloy preparation, in particular to a method for preparing a particle-reinforced novel 7XXX aluminum alloy strip. Background technique [0002] The thin strip continuous casting technology is a cutting-edge technology in the field of metallurgy today. The twin-roll thin strip continuous casting technology was first proposed by Henry Bessemer in 1865 (US Patent: 49053). Thin strip continuous casting integrates continuous casting, rolling, and even heat treatment into one, so that the produced thin strip can be rolled into an industrial product at one time, which greatly simplifies the production process of aluminum alloy thin strip and shortens the production time. The production cycle makes the aluminum alloy thin strip production process more compact, more continuous, more efficient, and more environmentally friendly; at the same time, the production cost is significantly reduced, and the quality and perf...

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Problems solved by technology

[0006] However, there are still many problems in the microstructure of the 7XXX aluminum alloy produced at present, which hinder its wide application, such as grain and precipitation coarsening, thermal cracking, and intermetallic compounds and eutectic phases are usually distributed along grain boundaries, etc., while the microstructure of aluminum alloy largely determines its mechanical properties

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