Novel particle-reinforced 7XXX aluminum alloy thin strip and preparation method thereof

Abstract

The invention relates to a novel particle-reinforced 7XXX aluminum alloy ribbon and a preparation method thereof, the aluminum alloy ribbon 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%, the content of a total impurity is less than or equal to 0.2%, and the microstructure of the aluminum alloy ribbon is a fine isometric crystal matrix structure and dispersively distributed hard particles. Compared with an existing 7XXX aluminum alloy, the strength of the prepared 7XXX aluminum alloy thin strip is improved by 25% or above, and the ductility is improved by 35% or above by adopting the nanoparticle reinforcement and double-roller thin strip continuous casting technology; compared with a steel plate, the weight is reduced by 50% 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 particle-reinforced 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, and the q...

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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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