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High-strength aluminum alloy and preparation method thereof

An aluminum alloy, high-strength technology, applied in the field of high-strength aluminum alloy and its preparation, can solve problems such as difficulty in meeting the requirements of overall manufacturing, and achieve enhanced heat resistance, excellent tensile mechanical properties, good rigidity and heat resistance. Effect

Inactive Publication Date: 2015-09-02
GUANGDONG INST OF MATERIALS & PROCESSING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Through literature search, it is found that Al-Zn-Mg-Cu series high-strength aluminum alloys mainly increase the strength of aluminum alloys by adding Zr, Sc, Ni, Cr and other alloying elements and rare earth elements, while Zn, Mg, and Cu are the main alloying elements. The total content is still lower than 20%, and the tensile strength of aluminum alloy is lower than 900MPa, which is still difficult to meet the overall manufacturing requirements of large structural parts such as aircraft wings and high-speed train carriages

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  • High-strength aluminum alloy and preparation method thereof

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Effect test

Embodiment 1

[0033] The composition and mass percentage of the high-strength aluminum alloy in this embodiment are: Zn 15.3%, Mg 5.6%, Cu 5.1%, Li 2.8%, W 2.1%, and the rest is Al.

[0034] The preparation method is as follows:

[0035] Step 1: Heat and melt industrial pure aluminum ingots in an intermediate frequency induction aluminum melting furnace and raise the temperature to 770°C, then add industrial pure Zn, pure Mg, pure Li and Al-Cu master alloy according to composition and mass percentage, stir and melt , refining with hexachloroethane, and after removing slag, aluminum alloy liquid is obtained;

[0036] The second step: transfer the aluminum alloy liquid to the gas atomization powder making machine, and atomize the aluminum alloy liquid into powder under the protection of nitrogen. The atomization temperature of the aluminum alloy liquid is 770 ° C, and the atomization nitrogen pressure is 3 MPa;

[0037]Step 3: Screen the aluminum alloy powder with a 190-mesh vibration screen...

Embodiment 2

[0047] The composition and mass percentage of the high-strength aluminum alloy in this embodiment are: Zn 16.5%, Mg 4.3%, Cu 4.0%, Li 3.4%, W 2.8%, and the rest is Al.

[0048] The preparation method is as follows:

[0049] Step 1: Heat and melt industrial pure aluminum ingots in an intermediate frequency induction aluminum melting furnace and raise the temperature to 780°C, then add industrial pure Zn, pure Mg, pure Li and Al-Cu master alloy according to composition and mass percentage, stir and melt , refining with hexachloroethane, and after removing slag, aluminum alloy liquid is obtained;

[0050] The second step: transfer the aluminum alloy liquid to the gas atomization powder making machine, and atomize the aluminum alloy liquid into powder under the protection of nitrogen. The atomization temperature of the aluminum alloy liquid is 780 ° C, and the atomization nitrogen pressure is 3.5 MPa;

[0051] Step 3: Screen the aluminum alloy powder with a 190-mesh vibration scr...

Embodiment 3

[0060] The composition and mass percentage of the high-strength aluminum alloy in this embodiment are: Zn 14.1%, Mg 3.9%, Cu 3.5%, Li 2.1%, W 1.4%, and the rest is Al.

[0061] The preparation method is as follows:

[0062] Step 1: Heat and melt industrial pure aluminum ingots in an intermediate frequency induction aluminum melting furnace and raise the temperature to 770°C, then add industrial pure Zn, pure Mg, pure Li and Al-Cu master alloy according to composition and mass percentage, stir and melt , refining with hexachloroethane, and after removing slag, aluminum alloy liquid is obtained;

[0063] The second step: transfer the aluminum alloy liquid to the gas atomization powder making machine, and atomize the aluminum alloy liquid into powder under the protection of nitrogen. The atomization temperature of the aluminum alloy liquid is 770°C, and the atomization nitrogen pressure is 4MPa;

[0064] Step 3: Screen the aluminum alloy powder with a 190-mesh vibration screenin...

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Abstract

The invention discloses a high-strength aluminum alloy and a preparation method thereof. The high-strength aluminum alloy comprises the following components in percentage by mass: 14.1-17.6% of Zn, 3.9-6.5% of Mg, 3.5-5.7% of Cu, 2.1-3.6% of Li, 1.4-2.8% of W and the balance of Al. The preparation method of the high-strength aluminum alloy comprises the following steps: preparing molten aluminium alloy; atomizing the molten aluminium alloy into powder; screening the aluminium alloy powder; mixing the aluminium alloy powder with tungsten powder; performing isostatic cool pressing on the mixture to prepare a preformed blank; degassing in vacuum, performing thermal extrusion on the preformed blank to obtain aluminum alloy; and performing solid solution and aging to finally obtain the high-strength aluminum alloy. According to the preparation method, since the total content of the main alloying elements (Zn, Mg and Cu) is controlled to be 21.5-29.8% and a proper amount of elements Li and W are further added, the prepared high-strength aluminum alloy has excellent tensile mechanical property, has the tensile strength of 929.4-957.1MPa, yield strength of 857.2-878.5 and elongation of 10.1-12.7%, and can reach the requirements of integrated manufacturing of large components such as airplane wings, compartments of high speed trains.

Description

technical field [0001] The invention belongs to the field of aluminum alloy material preparation, and in particular relates to a high-strength aluminum alloy and a preparation method thereof. Background technique [0002] Al-Zn-Mg-Cu series aluminum alloys are high-strength wrought aluminum alloys. As important lightweight structural materials, they are widely used in aerospace, rail transit and other fields. With the development of large aircraft and high-speed trains in China, especially the development of overall manufacturing technology for large structural parts such as aircraft wings and train carriages, the strength of aluminum alloy materials is also required to be higher and higher. [0003] When the Al-Zn-Mg-Cu series aluminum alloy is prepared by the traditional ingot casting method, since the cooling and solidification rate of the alloy generally does not exceed 10°C / s, when the content of the main alloying elements exceeds a certain limit, the solid solubility o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/04
Inventor 王顺成郑开宏胡权黄志其郑志铭
Owner GUANGDONG INST OF MATERIALS & PROCESSING