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A kind of heat treatment method of aluminum alloy material, aluminum alloy and auto parts

A heat treatment method and technology for aluminum alloy materials, which are applied in the field of aluminum alloys to achieve the effects of improving reversibility, promoting stress corrosion resistance, and improving expansion resistance.

Active Publication Date: 2022-01-14
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the coordination and matching and synergistic improvement of the fatigue resistance and corrosion resistance of aluminum alloys, especially Al-Zn-Mg-Cu alloys, remain to be resolved.

Method used

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  • A kind of heat treatment method of aluminum alloy material, aluminum alloy and auto parts
  • A kind of heat treatment method of aluminum alloy material, aluminum alloy and auto parts
  • A kind of heat treatment method of aluminum alloy material, aluminum alloy and auto parts

Examples

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Effect test

Embodiment 1

[0074] This embodiment provides a heat treatment method for an aluminum alloy. In terms of mass percentage, the chemical composition of the alloy is: Zn 8.0%, Mg 1.8%, Cu 2.1%, Mn 0.25%, Zr 0.10%, Fe≤0.05%, Si ≤0.05%, the balance is Al.

[0075] Heat treatment methods include:

[0076] Preheat the above alloy to 430°C after homogenization, and obtain a thin-walled profile with a thickness of 3mm through extrusion with an extrusion ratio of 55 and an extrusion rate of 2mm / s. During the extrusion process, the temperature of the extrusion die is 430 °C, the profile outlet temperature is 450 °C. After annealing at 430°C / 45min, air cooling to room temperature, and solution treatment at 470°C / 30min. After quenching and cooling in water, RRA1 (100°C / 24h+175°C / 20min+70°C / 30h) regression re-aging treatment is carried out. Among them, after the first-stage aging treatment (100°C / 24h), the furnace is air-cooled to room temperature for the second-stage aging treatment (175°C / 20min), an...

Embodiment 2

[0080] This embodiment provides a heat treatment method for an aluminum alloy. In terms of mass percentage, the chemical composition of the alloy is: Zn 8.3%, Mg 1.8%, Cu 2.0%, Mn 0.20%, Zr 0.15%, Fe≤0.05%, Si ≤0.05%, the balance is Al.

[0081] Heat treatment methods include:

[0082] Preheat the above alloy to 430°C after homogenization, and obtain a thin-walled profile with a thickness of 3mm through extrusion with an extrusion ratio of 55 and an extrusion rate of 2mm / s. During the extrusion process, the temperature of the extrusion die is 430 °C, the profile outlet temperature is 450 °C. After annealing at 430°C / 45min, air cooling to room temperature, and solution treatment at 470°C / 45min. After quenching and cooling in water, perform RRA2 (100°C / 24h+175°C / 12min+65°C / 40h) regression reaging treatment. Among them, after the first-stage aging treatment (100°C / 24h), the furnace is air-cooled to room temperature for the second-stage aging treatment (175°C / 12min), and after ...

Embodiment 3

[0085] This embodiment provides a heat treatment method for an aluminum alloy. In terms of mass percentage, the chemical composition of the alloy is: Zn 7.8%, Mg 1.8%, Cu 2.1%, Mn 0.25%, Zr 0.08%, Fe≤0.05%, Si ≤0.05%, the balance is Al.

[0086] Heat treatment methods include:

[0087] Preheat the above alloy to 440°C after homogenization, and obtain a thin-walled profile with a thickness of 3mm through extrusion with an extrusion ratio of 55 and an extrusion rate of 1mm / s. During the extrusion process, the temperature of the extrusion die is 430 ℃, the profile outlet temperature is 460 ℃. After annealing at 410°C / 90min, air cooling to room temperature, and solution treatment at 470°C / 30min. After quenching and cooling in water, RRA1 (100°C / 24h+175°C / 20min+70°C / 30h) regression re-aging treatment is carried out. Among them, after the first-stage aging treatment (100°C / 24h), the furnace is air-cooled to room temperature for the second-stage aging treatment (175°C / 20min), and ...

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Abstract

The invention discloses a heat treatment method for an aluminum alloy material, the aluminum alloy and auto parts, and belongs to the technical field of aluminum alloys. The heat treatment method includes: subjecting the aluminum alloy after annealing and solution treatment to three-stage aging treatment, the first-stage aging treatment is carried out at 100-120°C for 22-26h, and the second-stage aging treatment is carried out at 175°C. 6-20min at ‑185°C, and 28‑42h at 60‑75°C for the third-stage aging treatment. The method is simple and reasonable. The three-stage aging treatment can make the second phase of the alloy grain boundary present a coarse and discontinuous distribution to improve the corrosion resistance of the alloy. The low-temperature and long-term aging treatment of the third-stage aging treatment makes the GP area that can be cut by dislocation A large amount of formation is conducive to improving the reversibility of dislocation slip under cyclic loading and improving the fatigue resistance of the alloy. The aluminum alloy thus obtained has better fatigue resistance and corrosion resistance, and is suitable for industrial applications.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a heat treatment method for aluminum alloy materials, aluminum alloys and auto parts. Background technique [0002] In recent years, with the rapid development of domestic automobile lightweight, the demand for aluminum alloys with excellent comprehensive performance in my country's automobile manufacturing industry has become more and more urgent. Al-Zn-Mg-Cu alloy is considered as an ideal material for various structural parts such as automobile body trusses, bumpers, battery trays, etc. due to its low density and ultra-high strength. With the proposal and development of the damage tolerance theory of materials, Al-Zn-Mg-Cu alloy materials for automobiles are required to have excellent comprehensive properties such as high strength, high toughness, corrosion resistance and fatigue resistance. [0003] However, the coordination and matching and synergistic improvement o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053
Inventor 夏鹏黄惠兰贾义旺周楠宋东福
Owner GUANGDONG INST OF NEW MATERIALS
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