Thin-strip continuous casting high-performance 7XXX aluminum alloy thin strip and preparation method thereof

Abstract

The invention discloses a thin-strip continuous casting high-performance 7XXX aluminum alloy thin strip and a preparation method thereof, the aluminum alloy thin strip comprises the following components in percentage by mass: 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 content of a single impurity is less than or equal to 0.1%, and the content of total impurities is less than or equal to 0.2%. The semi-solid treatment is combined with the twin-roll thin strip continuous casting process, the microscopic structure of the prepared aluminum alloy thin strip is a fine isometric crystal matrix structure, and compared with an existing 7XXX aluminum alloy, the strength is improved by 20% or above, and the ductility is improved by 30% or above; compared with a steel plate, more than 40% of light weight is easily realized; 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 strip continuous casting high-performance 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 re...

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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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