Preparation method of thin-strip continuous casting high-performance 7XXX aluminum alloy thin strip

Abstract

The invention relates to a preparation method of a thin-strip continuous casting high-performance 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) performing semi-solid state treatment; 3) continuous casting; 4) cooling; 5) primary hot rolling; (6) cooling and secondary hot rolling; (7) coiling; and 8) post-processing. The microstructure of the 7XXX aluminum alloy thin strip obtained through the method is a fine isometric crystal matrix structure, and compared with an existing 7XXX aluminum alloy, the strength is improved by 15% or above, and the ductility is improved by 25% or above; compared with a steel plate, the weight is 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 thin strip continuous casting high-performance 7XXX aluminum alloy thin strips. 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,...

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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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