Aging heat treatment method for high-zinc aluminum alloy containing scandium

An aging 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, lack of theoretical basis and data accumulation, insufficient performance and heat treatment technology and system, etc. The effect of increasing the proportion, elongation, and improving mechanical properties

Inactive Publication Date: 2015-06-03
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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  • Aging heat treatment method for high-zinc aluminum alloy containing scandium
  • Aging heat treatment method for high-zinc aluminum alloy containing scandium
  • Aging heat treatment method for high-zinc aluminum alloy containing scandium

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Effect test

Embodiment 1

[0026] First, heat the high-zinc-scandium-containing aluminum alloy at 455°C for 4.5 hours, then transfer the high-zinc-scandium-containing aluminum alloy to room temperature water for 5 minutes 10 seconds after the heat preservation, and then perform a double-stage aging heat treatment: heat preservation at 100°C After 6 hours, the furnace was heated to 155°C within 2 hours and kept for 6 hours, and finally cooled to room temperature. The transmission electron microscope image of the high-zinc and scandium-containing aluminum alloy after aging heat treatment is as follows figure 1 shown, from figure 1 It can be seen that a large amount of fine Al particles dispersed in the aluminum alloy matrix after aging heat treatment 3 (Sc,Zr) particles, the mechanical properties curve is as follows figure 2 As shown, the hardness as image 3 As shown, its tensile strength is 750MPa, yield strength is 580MPa, elongation is 13.0%, and hardness is 140Hv.

Embodiment 2

[0028] First, heat the high-zinc-scandium-containing aluminum alloy at 460°C for 4 hours, then transfer the high-zinc-scandium-containing aluminum alloy to room temperature water for 5 minutes 10 seconds after the heat preservation, and then perform a double-stage aging heat treatment: heat preservation at 100°C for 5.5 After h, the temperature is raised to 155°C within 2 hours and kept for 7 hours with the furnace, and finally cooled to room temperature. The mechanical property curve of the high-zinc and scandium-containing aluminum alloy after aging heat treatment is as follows figure 2 As shown, the hardness as image 3 As shown, its tensile strength is 750MPa, yield strength is 580MPa, elongation is 13.6%, and hardness is 145Hv.

Embodiment 3

[0030] First, heat the high-zinc and scandium-containing aluminum alloy at 465°C for 3.5 hours, then transfer the high-zinc and scandium-containing aluminum alloy to room temperature water for 5 minutes after the heat preservation is over for 10 seconds, and then perform a double-stage aging heat treatment: heat preservation at 100°C After 6.5 hours, the furnace was heated to 155°C within 2 hours and kept for 8 hours, and finally cooled to room temperature. The mechanical property curve of the high-zinc and scandium-containing aluminum alloy after aging heat treatment is as follows: figure 2 As shown, the hardness as image 3 As shown, its tensile strength is 750MPa, yield strength is 580MPa, elongation is 13.2%, and hardness is 142Hv.

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Abstract

The invention belongs to the technical field of heat treatment of aluminum alloys, and specifically relates to an aging heat treatment method for a high-zinc aluminum alloy containing scandium. The method comprises the following steps: firstly, preserving heat for the high-zinc aluminum alloy containing scandium for 3.5-4.5h at the temperature of 455-465 DEG C, then, 10s later after heat preservation, transferring the high-zinc aluminum alloy containing scandium into water at room temperature for quenching for 5min, and further carrying out two-stage aging heat treatment: preserving heat for 5.5-6.5h at 100-120 DEG C, then, heating up to 155-175 DEG C in furnace and preserving heat for 6-8h, finally cooling to room temperature, and thereby obtaining the high-zinc aluminum alloy containing scandium subjected to aging heat treatment. With the method provided by the invention, hardness, tensile strength, yield strength and elongation of alloy are all improved remarkably, and application range of the high-zinc aluminum alloy containing scandium in the industrial circle is extended.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of aluminum alloys, and in particular relates to an aging 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. [0003] Microalloying can effectively inhibit the recrystallization and grain growth of Al-Zn-Mg-Cu aluminum alloy, and maintain the deformation recovery structure. 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 properties of A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22F1/053C22C21/10
Inventor 王高松赵志浩朱庆丰崔建忠
Owner NORTHEASTERN UNIV
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