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A kind of high toughness aluminum alloy and preparation method thereof

An aluminum alloy and high toughness technology, applied in the field of aluminum alloy materials, can solve the problems of reducing material toughness and cracking, and achieve the effects of reducing internal stress, improving purity and increasing quantity

Active Publication Date: 2022-04-15
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above studies are basically aimed at improving the strength of aluminum alloys, but there are few existing technologies for improving toughness. After the addition of rare earths to aluminum alloys, although a part of Fe, Si and rare earths form compounds and are discharged as slag, the aluminum alloys Due to the presence of Fe and Si impurities, a large number of acicular Fe-containing and Si-containing phases will be formed in the aluminum alloy matrix. During the force loading process, a large number of crack sources will be formed along the acicular phases, reducing the toughness of the material, resulting in Subsequent use cracking

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  • A kind of high toughness aluminum alloy and preparation method thereof
  • A kind of high toughness aluminum alloy and preparation method thereof
  • A kind of high toughness aluminum alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034]The mass percentage composition of the aluminum alloy of this embodiment is: Zn 6.2%, Mg 2.2%, Cu 1.9%, Mn 0.4%, Y0.52%, Cr 0.15%, Fe 0.38%, Si 0.46%, Ti 0.05%, the balance For Al and unavoidable impurities.

[0035] Including the following preparation steps:

[0036] 1) Aluminum alloy melting;

[0037] Calculate the respective weights of aluminum ingots, zinc ingots, magnesium ingots, aluminum-copper master alloys, aluminum-manganese master alloys, aluminum-chromium master alloys and magnesium-yttrium master alloys according to the alloy composition of aluminum alloys and prepare materials. Heat up the resistance crucible furnace, coat the inner wall of the crucible with ZnO paint, put the aluminum ingot after drying, and heat the resistance crucible furnace; after the aluminum ingot is melted, add aluminum-copper master alloy, aluminum-manganese master alloy and aluminum-chromium master alloy, and heat up to 750°C, add magnesium-yttrium master alloy; cool down to 730...

Embodiment 2

[0045] The mass percent composition of the aluminum alloy of this embodiment is: Zn 6.8%, Mg 2.8%, Cu 1.6%, Mn 0.22%, Y 1.15%, Cr 0.19%, Fe 0.35%, Si 0.41%, Ti 0.07%, the balance For Al and unavoidable impurities.

[0046] Including the following preparation steps:

[0047] 1) Aluminum alloy melting:

[0048] Calculate the respective weights of aluminum ingots, zinc ingots, magnesium ingots, aluminum-copper master alloys, aluminum-manganese master alloys, aluminum-chromium master alloys and magnesium-yttrium master alloys according to the alloy composition of aluminum alloys and prepare materials. Heat up the resistance crucible furnace, coat the inner wall of the crucible with ZnO paint, put the aluminum ingot after drying, and heat the resistance crucible furnace; after the aluminum ingot is melted, add aluminum-copper master alloy, aluminum-manganese master alloy and aluminum-chromium master alloy, and heat up to 790°C, add magnesium-yttrium master alloy; cool down to 730...

Embodiment 3

[0056] The mass percent composition of the aluminum alloy of this embodiment is: Zn 5.1%, Mg 1.8%, Cu 1.4%, Mn0.56%, Y 0.1%, Cr 0.19%, Fe 0.35%, Si 0.41%, Ti 0.07%, and the rest The amount is Al and unavoidable impurities.

[0057] The preparation steps of the aluminum alloy material are:

[0058] 1) Aluminum alloy melting;

[0059] Calculate the respective weights of aluminum ingots, zinc ingots, magnesium ingots, aluminum-copper master alloys, aluminum-manganese master alloys, aluminum-chromium master alloys and magnesium-yttrium master alloys according to the alloy composition of aluminum alloys and prepare materials. Heat up the resistance crucible furnace, coat the inner wall of the crucible with ZnO paint, put the aluminum ingot after drying, and heat the resistance crucible furnace; after the aluminum ingot is melted, add aluminum-copper master alloy, aluminum-manganese master alloy and aluminum-chromium master alloy, and heat up to 750°C, add magnesium-yttrium master...

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Abstract

The invention discloses a high-toughness aluminum alloy, which is characterized in that: the mass percentage composition of the aluminum alloy is Zn: 5.0%-7.0%, Mg: 1.8%-2.8%, Cu: 1.4%-2.0%, Mn: 0.2% %~0.6%, Y: 0.1%~1.2%, Cr: 0.1%~0.25%, Fe≤0.5%, Si≤0.5%, Ti≤0.1%, the balance is Al and unavoidable impurities. The invention adds rare earth element Y on the basis of aluminum alloy, which is beneficial to increase the number of crystal grains and reduce the size of as-cast crystal grains. The Y element has strong chemical activity and is easy to form new phases with the above impurity phases. It is in the form of particles, and a small amount of new phases is removed with the slag to improve the purity of the aluminum alloy, while the remaining needle-shaped Fe-containing and Si-containing compounds are reduced. The internal stress of the material is reduced, and the source of crack propagation is reduced when the force is applied, which is beneficial to the improvement of the toughness of the aluminum alloy.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy materials, in particular to a high-toughness aluminum alloy and a preparation method thereof. Background technique [0002] Al-Zn-Mg-Cu series aluminum alloy has the characteristics of low density, high strength, good toughness and corrosion resistance, excellent processability and welding performance, and is an important structure for lightweight design and comprehensive performance improvement of aircraft, vehicles, tools, etc. Materials are widely used in transportation, electronics, bridges, decoration and other industries, and the amount of use ranks first among non-ferrous metal materials. In addition, because aluminum alloy has broad application prospects and irreplaceable status in aerospace, shipbuilding, nuclear industry and weapon industry, high-strength aluminum alloy technology is listed as the key technology of national defense technology and the basic technology for key devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C21/10C22C1/026C22C1/03C22F1/053
Inventor 王荣宋运坤徐英曹召勋王军任政徐永东朱秀荣邵志文
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH