Novel 7XXX aluminum alloy thin strip for thin strip continuous casting and preparation method of novel 7XXX aluminum alloy thin strip

Abstract

The invention relates to a strip continuous casting novel 7XXX aluminum alloy strip and a preparation method thereof, the aluminum alloy comprises the following components by mass percent: 4.8-6.3% of Zn, 1.6-2.5% of Mg, 1.6-2.5% of Cu, 0.1-0.15% of Zr, 0.01-0.08% of Ti, 0.001-0.008% of B, 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%. The aluminum alloy thin strip is prepared through the double-roller thin strip continuous casting technology, the microscopic structure of the aluminum alloy thin strip is a fine equiaxed crystal matrix structure, and compared with an existing 7XXX aluminum alloy, the strength of the aluminum alloy thin strip is improved by 10% or above, and the ductility of the aluminum alloy thin strip is improved by 20% or above; compared with a steel plate, the weight is reduced by 30% or more. The material can be widely applied to the field of aerospace, such as various aircraft fuselages, wing beams, cabin wallboards, aircraft high-stress structural parts, aircraft skins, high-strength structural parts in aircraft rockets and the like, and can provide a wide space for aerospace high reinforcement, light weight, energy consumption reduction and fuel economy improvement.

Description

technical field [0001] The invention relates to the field of aluminum alloy preparation, in particular to a thin strip continuous casting novel 7XXX aluminum alloy thin strip and a preparation method thereof. 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,...

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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