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, and achieve the effects of improving mechanical properties, service life and temperature, and high thermal stability

Active Publication Date: 2020-11-27
CENT SOUTH UNIV
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  • Abstract
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  • 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

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  • High-strength Al-Zn-Mg-Cu aluminum alloy and preparation method thereof

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Embodiment 1

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

[0039] Concrete preparation method, step are:

[0040] A. Melting: High-purity aluminum, high-purity magnesium, aluminum-copper master alloy, aluminum-scandium master alloy, aluminum-zinc master alloy, and aluminum-zirconium master alloy are used as raw materials. Among them, the purity of high-purity aluminum is 99.9%, 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%, and the content of zirconium in the aluminum-zirconium master alloy is The content is 40.0%, the content of zinc in the aluminum-zinc master alloy is 20.0%, and the content of yttrium in the aluminum-...

Embodiment 2

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

[0050] Concrete preparation method, step are:

[0051] A. Melting: High-purity aluminum, high-purity magnesium, aluminum-copper master alloy, aluminum-scandium master alloy, aluminum-zinc master alloy, and aluminum-zirconium master alloy are used as raw materials. Among them, the purity of high-purity aluminum is 99.9%, 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%, and the content of zirconium in the aluminum-zirconium master alloy is The content is 40.0%, the content of zinc in the aluminum-zinc master alloy is 20.0%, and the content of yttrium in the aluminum-yttrium master alloy is 10%. Th...

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Abstract

The invention discloses a high-strength Al-Zn-Mg-Cu aluminum alloy and a preparation method thereof, and relate to the field of aluminum alloy. The aluminum alloy comprises, by weight, less than or equal to 0.5% of Si, less than or equal to 0.5% of Fe, 5.0%-7.0% of Zn, 2.0%-3.0% of Cu, 1.5%-3.0% of Mg, 0.15%-0.35% of Sc, 0.1%-0.2% of Zr, 0.1%-0.3% of Y, and the balance aluminum and non-impurities.The preparation method comprises the following steps of smelting, die, refining and impurity removal and gas removal, pouring, homogenizing heat treatment, three-dimensional large deformation forgingpre-deformation, isothermal deformation processing and heat treatment. A casting mold adopts a metal mold as an inner mold, the casting mold is surrounded by a cooling pipe, a sand mold is used as aspecial combination mold of an outer mold, and a high-quality and high-performance casting is obtained; and the heat treatment comprisessolution treatment+gradient aging treatment. According to the prepared Al-Zn-Mg-Cu aluminum alloy, the strength reaches 650 MPa, the elongation is 10%-13%, the elongation is improved while the strength is improved, and the service life is prolonged; and the Al-Zn-Mg-Cu aluminum alloy has important value in the field of high-strength aluminum alloy.

Description

technical field [0001] The invention provides a high-strength Al-Zn-Mg-Cu aluminum alloy and a preparation method thereof, belonging to the field of aluminum alloys. Background technique [0002] Al-Zn-Mg-Cu aluminum alloy has the characteristics of low density, high strength and excellent plasticity. It also has excellent electrical and thermal conductivity. It has a wide range of applications in the industrial field, especially in the aerospace field. It is an important structural material for aerospace vehicles. , Aircraft fuselage joints, frames, wheels and other supporting structural parts are all made of aluminum alloy. [0003] The tensile strength and fatigue resistance of the currently used Al-Zn-Mg-Cu aluminum alloys are low, and the microstructure needs to be further optimized to improve performance and meet the needs of aerospace. Chinese patent CN107502796A discloses a Sc-Zr-Yb composite reinforced Al-Zn-Mg alloy and its preparation method, the composition incl...

Claims

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Application Information

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Patent Type & Authority Applications(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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