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Solid solution thermal treatment method for high-zinc scandium-containing aluminum alloy

A solid solution heat treatment, scandium aluminum alloy technology, applied in the field of aluminum alloy heat treatment, can solve the problems of increasing difficulty of alloy formability, insufficient performance and heat treatment technology and lack of systematic, lack of theoretical basis and data accumulation, etc., to achieve increased precipitation phase. , hinder the movement of dislocations, the effect of small precipitates

Inactive Publication Date: 2015-05-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the Zn content has a great influence on the yield strength. With the increase of Zn content, the strength of the alloy increases significantly, but with the increase of Zn content, the difficulty of the formability of the alloy increases significantly.
[0004] At present, our country mainly studies the forming process of high-zinc alloys. The understanding of its properties and heat treatment technology is not deep and systematic enough, and it lacks effective theoretical basis and data accumulation. Therefore, it is urgent to carry out systematic and in-depth research on the heat treatment process of high-zinc and scandium-containing aluminum alloys. Research

Method used

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  • Solid solution thermal treatment method for high-zinc scandium-containing aluminum alloy

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Effect test

Embodiment 1

[0028] First, heat the high-zinc and scandium-containing aluminum alloy at 410°C for 3 hours, then raise the temperature to 475°C for 4 hours, transfer it to water at room temperature for 5 minutes within 10 seconds, and then perform single-stage aging heat treatment: at 120°C Keep it warm for 24.5 hours, and finally air-cool to room temperature. The metallographic structure of the high-zinc and scandium-containing aluminum alloy after solution heat treatment is as follows figure 1 shown, from figure 1 It can be seen that a large number of fine and dispersed particles are precipitated in the alloy. The mechanical properties of the high-zinc and scandium-containing aluminum alloy after solution heat treatment are shown in Fig. figure 2 As shown, the hardness as image 3 As shown in the figure, it can be seen from the figure that the tensile strength of the high-zinc and scandium-containing aluminum alloy after solution heat treatment reaches 728MPa, the yield strength reaches...

Embodiment 2

[0030] First, heat the high-zinc and scandium-containing aluminum alloy at 410°C for 4h, then raise the temperature to 475°C for 4h, transfer it to water at room temperature for 5min within 10s, and then perform single-stage aging heat treatment: at 120°C Keep it warm for 24.5 hours, and finally air-cool to room temperature. The mechanical properties of the high-zinc and scandium-containing aluminum alloy after solution heat treatment are shown in the figure figure 2 As shown, the hardness as image 3 As shown in the figure, it can be seen from the figure that the tensile strength of the high-zinc and scandium-containing aluminum alloy after solution heat treatment reaches 741MPa, the yield strength reaches 572MPa, the elongation rate reaches 13.88%, and the hardness reaches 137Hv. Performance has been significantly improved.

Embodiment 3

[0032] First, heat the high-zinc and scandium-containing aluminum alloy at 410°C for 5 hours, then raise the temperature to 475°C for 4 hours, transfer it to water at room temperature for 5 minutes within 10 seconds, and then perform single-stage aging heat treatment: at 120°C Keep it warm for 24.5 hours, and finally air-cool to room temperature. The mechanical properties of the high-zinc and scandium-containing aluminum alloy after solution heat treatment are shown in the figure figure 2 As shown, the hardness as image 3 As shown in the figure, it can be seen from the figure that the tensile strength of the high-zinc and scandium-containing aluminum alloy after solution heat treatment reaches 734MPa, the yield strength reaches 566MPa, the elongation rate reaches 14.46%, and the hardness reaches 131Hv. Performance has been significantly improved.

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Abstract

The invention belongs to the technical field of aluminum alloy thermal treatment, and relates to a solid solution thermal treatment method for a high-zinc scandium-containing aluminum alloy. The solid solution thermal treatment method comprises the following steps: firstly, keeping the temperature of the high-zinc scandium-containing aluminum alloy at 390-420 DEG C for 3-5 hours, heating to be 455-475 DEG C, keeping the temperature for 3-5 hours, transferring the high-zinc scandium-containing aluminum alloy into water at the room temperature within 10 seconds so as to quench for 5 minutes, and further performing single-stage aging thermal treatment; keeping the temperature for 23.5-24.5 hours at 120 DEG C, and finally performing air-cooling to be the room temperature, thereby obtaining the high-zinc scandium-containing aluminum alloy subjected to solid solution thermal treatment. By adopting the solid solution thermal treatment method for the aluminum alloy, the hardness, the tension strength, the yield strength and the ductility of the alloy are all remarkably improved, so that the application range of the aluminum alloy in the industrial field is greatly widened.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of aluminum alloys, and in particular relates to a solid solution heat treatment method for high-zinc and scandium-containing aluminum alloys. Background technique [0002] High-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy has the advantages of low density, high strength, and good thermal processing performance, and is an important structural material in the aerospace field. With the development of aerospace, transportation and other industrial technologies, the requirements for structural materials are gradually increasing. Microalloying can effectively inhibit the recrystallization and grain growth of Al-Zn-Mg-Cu aluminum alloy, and maintain the deformation recovery structure. [0003] Scandium is the most effective alloying element found so far to optimize the properties of aluminum alloys. Scandium can improve the strength, plasticity, corrosion resistance and welding propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22F1/002C22F1/053
Inventor 赵志浩王高松朱庆丰崔建忠
Owner NORTHEASTERN UNIV
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