Creep aging forming method for Al-Cu-Mg series alloy sheet material

Abstract

The invention discloses a creep aging forming method for an Al-Cu-Mg series alloy sheet material. The creep aging forming method relates to a heat treatment method for reducing creep aging anisotropy of the Al-Cu-Mg alloy sheet material and improving an alloy performance. The method comprises the following steps of: water quenching after adopting solid-solution treatment at 490-505 DEG C for 30-70 minutes, carrying out 2-10% of predeformation processing on a quenched sheet material, and then carrying out creep aging, wherein a creep temperature is 150-200 DEG C; creep time is 0-12 hours; creep stress is 150-300 MPa, and predeformation processing time is controlled within 4 hours. By adopting the creep aging forming method to process an Al-Cu-Mg alloy, a mechanical property of the alloy sheet material can be improved and a degree of anisotropy of the sheet material can be reduced by controlling precipitation of an alloy creep aging strengthening phase. Compared with common thermal treatment, tensile strength of a room temperature is improved by at least 10%, and the anisotropy is reduced by at least 10% by adopting the creep aging forming method to process the Al-Cu-Mg alloy. The technique is simple in operation, and remarkable in effect. Compared with improvement of alloy microstructure components by a microalloying manner, cost is saved; the method is easy to achieve in industrial production, and comprehensive benefit is obviously higher than that of a reported processing method.

Description

technical field [0001] The invention relates to a heat treatment method for improving the performance and anisotropy degree of a creep-formed aluminum alloy plate, which is suitable for the creep-formation of Al-Cu-Mg alloy plate components used in aerospace and the technical fields of non-ferrous metal material processing engineering. Background technique [0002] Al-Cu-Mg alloy metal aging strengthened aluminum alloy has many advantages such as high strength, good fracture toughness, heat resistance, corrosion resistance, fatigue crack growth resistance, etc., and is widely used as the wall plate and skin of aerospace class building materials. Studies have shown that the main strengthening phase of Al-Cu-Mg alloys is Al 2 CuMg, Al 2 During the conventional creep aging process, the precipitation behavior of Cu will be affected by the direction of the applied stress, resulting in the S′ and θ′ phases under the tensile stress <100> Al In the direction, the precipitat...

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Problems solved by technology

Studies have shown that the main strengthening phase of Al-Cu-Mg alloys is Al 2 CuMg, Al 2 During the conventional creep aging process, the precipitation behavior of Cu will be affected by the direction of the applied stress, resulting in the S′ and θ′ phases under the tensile stress Al In the direction, the precipitation is preferentially parallel to the stress direction, and the precipitation is preferentially perpendicular to the stress direction under the action of compressive stress, that is, the so-called precipitation orientation effect occurs, which increases the anisotropy of the alloy sheet and causes the inhomogeneity of the component properties

Al-Cu-Mg alloy components with severe anisotropy are difficult to meet the requirements of high-end equipment such as aerospace

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