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

An aluminum alloy, high-strength technology, applied in the field of aluminum alloy, can solve the problems of low tensile strength and fatigue resistance, achieve the effects of improving mechanical properties, increasing service life and temperature, and reducing production costs

Active Publication Date: 2021-11-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low tensile strength and fatigue resistance of Al-Zn-Mg-Cu aluminum alloy, the present invention provides a high-strength Al-Zn-Mg-Cu aluminum alloy and a preparation method thereof, using Sc, Zr, Y micro Alloying, combined with casting process control to prepare high-quality ingots, using three-dimensional large-deformation multi-directional forging to pre-deform the ingots, and then performing isothermal extrusion or isothermal forging deformation processing, while avoiding improving deformation energy storage, achieving sub- Structural strengthening, combined with solid solution + aging heat treatment, to achieve the purpose of improving the strength and elongation of aluminum alloy at the same time

Method used

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

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Effect test

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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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% ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053B22D7/06
CPCB22D7/005B22D7/064B22D7/068C22C1/026C22C1/03C22C21/10C22F1/053
Inventor 刘祖铭周旭任亚科农必重卢思哲曹镔艾永康魏冰吕学谦
Owner CENT SOUTH UNIV
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