A kind of high-strength al-zn-mg-cu aluminum alloy and preparation method thereof

Abstract

The invention discloses a high-strength Al-Zn-Mg-Cu aluminum alloy and a preparation method thereof, relates to the field of aluminum alloys, and comprises the following components by weight percentage: Si: ≤0.5%, Fe: ≤0.5%, Zn: 5.0-0% 7.0%, Cu: 2.0‑3.0%, Mg: 1.5‑3.0%, Sc: 0.15‑0.35%, Zr: 0.1‑0.2%, Y: 0.1‑0.3%, and the balance is aluminum and non-removable impurities. The preparation method is as follows: smelting, mould, refining and degassing, pouring, homogenizing heat treatment, three-dimensional large deformation forging pre-deformation, isothermal deformation processing and heat treatment. The casting mold used is a special composite mold in which a metal mold is used as an inner mold, surrounding a cooling pipe, and a sand mold is used as an outer mold to prepare high-quality, high-performance castings; the heat treatment is solid solution treatment + gradient aging treatment. The Al-Zn-Mg-Cu aluminum alloy prepared by the present invention has a strength of 650 MPa and an elongation of 10-13%. While the strength is improved, the elongation is improved and the service life is improved. The field of alloys has significant value.

Description

Technical field

[0001] The present invention provides a high strength Al-Zn-Mg-Cu aluminum alloy and a preparation method thereof, belonging to the aluminum alloy. Background technique

[0002] The Al-Zn-Mg-Cu aluminum alloy has the characteristics of low density, high strength and excellent plasticity, and has excellent electrical conductivity and thermal conductivity. It has a wide range of applications in the industrial sector, especially in the aerospace field, is an important structural material for aviation aircraft. , The aircraft body joint, frame, and hub, etc. have an aluminum alloy.

[0003] The tensile strength of Al-Zn-Mg-Cu aluminum alloy is currently used, and the anti-fatigue performance is low, and it is necessary to further optimize microstructure, improve performance, meet aerospace needs. China Patent CN107502796A discloses a SC-Zr-YB composite reinforced Al-Zn-Mg alloy and a preparation method thereof, and the composition comprises from 5.8-6.9% Zn, 2.0-2.5% ...

Examples

Embodiment 1

[0038] A high strength Al-Zn-Mg-Cu aluminum alloy, alloy composition is 2.3% by weight of the copper content, 2.4% mg content, zinc content 6.2%, Si: ≤ 0.5%, Fe: ≤ 0.5%, SC The content was 0.26%, the Zr content was 0.13%, SC: Zr = 2: 1, Y: 0.3%, the margin is aluminum.

[0039] The specific preparation method, the steps are:

[0040] A, smelting: high-pure aluminum, high-pure magnesium, aluminum copper, aluminum, intermediate alloy, aluminum zinc intermediate alloy, aluminum zirconia alloy is raw material. Among them, the purity of high pure aluminum is 99.9%, the purity of industrial pure magnesium is 99.9%, and the content of copper in the intermediate alloy in the aluminum copper is 50.0%, and the content of the aluminum mid-alloy is 2.0%, zirconium in aluminum zirconium alloy. The content is 40.0%, and the content of zinc in the intermediate alloy in aluminum zinc is 20.0%, and the content of 钇 in the middle alloy in the aluminum is 10%, and the raw material is weighed accordi...

Embodiment 2

[0049] A high strength Al-Zn-Mg-Cu aluminum alloy, alloy composition is 2.3% by weight of the copper content, 2.4% magnesium content, 6.2% zinc content, 0.3% SC content, and Zr content of 0.1%, SC: Zr = 3: 1, Y: 0.3%, the margin is pure aluminum.

[0050] The specific preparation method, the steps are:

[0051] A, smelting: high-pure aluminum, high-pure magnesium, aluminum copper, aluminum, intermediate alloy, aluminum zinc intermediate alloy, aluminum zirconia alloy is raw material. Among them, the purity of high pure aluminum is 99.9%, the purity of industrial pure magnesium is 99.9%, and the content of copper in the intermediate alloy in the aluminum copper is 50.0%, and the content of the aluminum mid-alloy is 2.0%, zirconium in aluminum zirconium alloy. The content is 40.0%, and the content of zinc in the intermediate alloy in aluminum zinc is 20.0%, and the content of 钇 in the middle alloy in the aluminum is 10%, and the raw material is weighed according to the ratio, and th...

Technical field

[0001] The present invention provides a high strength Al-Zn-Mg-Cu aluminum alloy and a preparation method thereof, belonging to the aluminum alloy. Background technique

[0002] The Al-Zn-Mg-Cu aluminum alloy has the characteristics of low density, high strength and excellent plasticity, and has excellent electrical conductivity and thermal conductivity. It has a wide range of applications in the industrial sector, especially in the aerospace field, is an important structural material for aviation aircraft. , The aircraft body joint, frame, and hub, etc. have an aluminum alloy.

[0003] The tensile strength of Al-Zn-Mg-Cu aluminum alloy is currently used, and the anti-fatigue performance is low, and it is necessary to further optimize microstructure, improve performance, meet aerospace needs. China Patent CN107502796A discloses a SC-Zr-YB composite reinforced Al-Zn-Mg alloy and a preparation method thereof, and the composition comprises from 5.8-6.9% Zn, 2.0-2.5% ...

Examples

Embodiment 1

[0038] A high strength Al-Zn-Mg-Cu aluminum alloy, alloy composition is 2.3% by weight of the copper content, 2.4% mg content, zinc content 6.2%, Si: ≤ 0.5%, Fe: ≤ 0.5%, SC The content was 0.26%, the Zr content was 0.13%, SC: Zr = 2: 1, Y: 0.3%, the margin is aluminum.

[0039] The specific preparation method, the steps are:

[0040] A, smelting: high-pure aluminum, high-pure magnesium, aluminum copper, aluminum, intermediate alloy, aluminum zinc intermediate alloy, aluminum zirconia alloy is raw material. Among them, the purity of high pure aluminum is 99.9%, the purity of industrial pure magnesium is 99.9%, and the content of copper in the intermediate alloy in the aluminum copper is 50.0%, and the content of the aluminum mid-alloy is 2.0%, zirconium in aluminum zirconium alloy. The content is 40.0%, and the content of zinc in the intermediate alloy in aluminum zinc is 20.0%, and the content of 钇 in the middle alloy in the aluminum is 10%, and the raw material is weighed accordi...

Embodiment 2

[0049] A high strength Al-Zn-Mg-Cu aluminum alloy, alloy composition is 2.3% by weight of the copper content, 2.4% magnesium content, 6.2% zinc content, 0.3% SC content, and Zr content of 0.1%, SC: Zr = 3: 1, Y: 0.3%, the margin is pure aluminum.

[0050] The specific preparation method, the steps are:

[0051] A, smelting: high-pure aluminum, high-pure magnesium, aluminum copper, aluminum, intermediate alloy, aluminum zinc intermediate alloy, aluminum zirconia alloy is raw material. Among them, the purity of high pure aluminum is 99.9%, the purity of industrial pure magnesium is 99.9%, and the content of copper in the intermediate alloy in the aluminum copper is 50.0%, and the content of the aluminum mid-alloy is 2.0%, zirconium in aluminum zirconium alloy. The content is 40.0%, and the content of zinc in the intermediate alloy in aluminum zinc is 20.0%, and the content of 钇 in the middle alloy in the aluminum is 10%, and the raw material is weighed according to the ratio, and th...

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