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

An al-cu-mg-mn, aluminum alloy technology, applied in the field of aluminum alloy, can solve the problems of low tensile performance, impact toughness and fatigue resistance, achieve excellent mechanical properties, improve the degree of segregation, and improve the overall performance of the alloy Effect

Active Publication Date: 2021-11-23
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low tensile properties, impact toughness and fatigue resistance of Al-Cu-Mg-Mn aluminum alloys, the present invention provides a high-strength Al-Cu-Mg-Mn aluminum alloy and a preparation method thereof, using Sc, Zr , Y microalloying, 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 carry out isothermal extrusion or isothermal forging deformation processing, while avoiding improving deformation energy storage , to achieve substructure strengthening, combined with solid solution + gradient aging heat treatment, to achieve the purpose of improving the strength and elongation of aluminum alloy at the same time

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

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Embodiment 1

[0035] A high-strength Al-Cu-Mg-Mn aluminum alloy, the alloy composition by weight percentage: copper content 5.0%, Mg content 0.6%, manganese content 1.0%, Si: ≤ 0.5%, Fe: ≤ 0.5%, Sc The content is 0.26%, the Zr content is 0.13%, Sc:Zr=2:1, Y: 0.3%, and the balance is aluminum.

[0036] The specific preparation method and steps are:

[0037] A. Smelting: using high-purity aluminum, high-purity magnesium, aluminum-copper master alloy, aluminum-scandium master alloy, aluminum-manganese master alloy, and aluminum-zirconium master alloy as raw materials; among them, the purity of high-purity aluminum is 99.9%, and the purity of industrial pure magnesium is 99.9% %, the content of copper in the aluminum-copper master alloy is 50.0%, the content of scandium in the aluminum-scandium master alloy is 2.0%, the content of zirconium in the aluminum-zirconium master alloy is 40.0%, and the content of manganese in the aluminum-manganese master alloy is 20.0%, The content of yttrium in th...

Embodiment 2

[0046] A high-strength Al-Cu-Mg-Mn aluminum alloy, the alloy composition by weight percentage: copper content 4.6%, magnesium content 0.6%, manganese content 0.8%, Sc content 0.3%, Zr content 0.1%, Sc: Zr=3:1, Y: 0.3%, and the balance is pure aluminum.

[0047] The specific preparation method and steps are:

[0048] A. Smelting: using high-purity aluminum, high-purity magnesium, aluminum-copper master alloy, aluminum-scandium master alloy, aluminum-manganese master alloy, and aluminum-zirconium master alloy as raw materials; among them, the purity of high-purity aluminum is 99.9%, and the purity of industrial pure magnesium is 99.9% %, the content of copper in the aluminum-copper master alloy is 50.0%, the content of scandium in the aluminum-scandium master alloy is 2.0%, the content of zirconium in the aluminum-zirconium master alloy is 40.0%, and the content of manganese in the aluminum-manganese master alloy is 20.0%, The content of yttrium in the aluminum-yttrium master a...

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Abstract

The invention discloses a high-strength Al-Cu-Mg-Mn 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%, Cu: 4.5- 6.3%, Mg: 0.6‑1.2%, Mn: 0.6‑1.5%, 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 includes smelting, refining to remove impurities and gas, 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-Cu-Mg-Mn aluminum alloy prepared by the present invention has a strength greater than 520 MPa and an elongation of 12-16%, and the elongation is improved while the strength is improved. The method of the invention is simple and has important value in the field of high-strength aluminum alloys.

Description

technical field [0001] The invention provides a high-strength Al-Cu-Mg-Mn aluminum alloy and a preparation method thereof, belonging to the field of aluminum alloys. Background technique [0002] Al-Cu-Mg-Mn aluminum alloy has the characteristics of low density, high strength, excellent plasticity, and excellent electrical and thermal conductivity. It has a wide range of applications in the industrial field, especially in the aerospace field. , The aircraft fuselage joints, frames, hubs and other supporting structural components are all made of aluminum alloys. [0003] The tensile strength and fatigue resistance of the Al-Cu-Mg-Mn aluminum alloy currently used are low, and it is necessary to further optimize the microstructure and improve the performance to meet the needs of aerospace. Adding Sc element to aluminum alloy can refine the grain and improve the strength and processing performance of the alloy. Sun et al.[FangfangSun,et al.Effect of Sc and Zr additions onmicro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/16C22C21/14C22C1/03C22F1/057
CPCC22C21/16C22C21/14C22C1/026C22C1/03C22F1/057C22C1/02
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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