Er-containing high-strength anti-corrosion Al-Zn-Mg aluminum alloy and preparation method

Abstract

The invention relates to the field of aluminum alloy, and discloses an Er-containing high-strength anti-corrosion Al-Zn-Mg aluminum alloy and a preparation method. The Er-containing high-strength anti-corrosion Al-Zn-Mg aluminum alloy contains, by mass, 3.5-5.5% of Zn, 1.5-3.0% of Mg, 0.2-0.6% of Cu, 0.2-0.6% of Mn, 0.01-0.25% of Er, 0.01-0.25% of Zr and the balance Al and unavoidable impurities.The invention further discloses a preparation process and thermal treatment process for the Er-containing high-strength anti-corrosion Al-Zn-Mg alloy. The processes comprise the steps of fusion casting, homogenization, thermal deformation, solution hardening treatment and aging treatment. The Er-containing high-strength anti-corrosion Al-Zn-Mg aluminum alloy is excellent in room-temperature tensile property, high-temperature tensile property and resistance to exfoliation corrosion, the requirements for industrial application in the transportation field are met, and the preparation method is suitable for production and manufacturing.

Description

technical field [0001] The invention relates to an Er-containing high-strength and corrosion-resistant Al-Zn-Mg series aluminum alloy, which can be used in the fields of aerospace and transportation, and belongs to the field of non-ferrous metal materials. Background technique [0002] With the development of aerospace and transportation fields, the performance requirements of materials are constantly improving. In order to meet the needs of lightweight carriers, energy saving and emission reduction, materials with low density, high strength, good formability and excellent corrosion resistance have become the pursuit direction. As a heat-treatable aluminum alloy, Al-Zn-Mg aluminum alloys can obtain component materials with excellent comprehensive properties through appropriate heat treatment processes. [0003] Al-Zn-Mg-(Cu) alloys widely used at present include medium-strength aluminum alloys represented by 7003, 7005, and 7N01, but with excellent processability. Their yie...

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Problems solved by technology

[0004] The addition of trace elements can modify the aluminum alloy. The commonly used microalloy elements include Mn, Ti, Sc, Zr, Ag, etc. These trace elements can produce dispersed particles during homogenization annealing in the as-cast state. It hinders the migration of dislocations and grain boundaries, which can significantly improve its comprehensive performance. Among them, the addition of Sc can improve the performance most obviously, but its high price limits its application in industrial production.

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