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

Abstract

The invention relates to a preparation method of a high-performance novel 7XXX aluminum alloy thin strip, which comprises the following steps of: 1) smelting: 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) carrying out semi-solid treatment and nano-particle enhancement; 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 prepared through the method is a fine isometric crystal matrix structure and dispersively distributed hard particles, and compared with an existing 7XXX aluminum alloy, the strength of the 7XXX aluminum alloy thin strip is improved by 25% or above, and the ductility of the 7XXX aluminum alloy thin strip is improved by 35% or above; compared with a steel plate, the weight is reduced by 50% or more.

Description

technical field [0001] The invention relates to the field of aluminum alloy preparation, in particular to a method for preparing a high-performance 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 perform...

AI Technical Summary

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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