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Thermal treatment method for aluminum alloy

A heat treatment method and technology for aluminum alloys, applied in the field of heat treatment of aluminum alloys, can solve the problems of not fully exploiting the strength potential of the alloy, restricting the use range of the alloy, and reducing the strength.

Active Publication Date: 2009-11-04
溧阳常大技术转移中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to obtain the highest strength, this series of aluminum alloys is often subjected to T6 peak aging. In this state, although the intragranular precipitates are fine and dispersed, the grain boundary precipitates are coarse in size and distributed continuously. Therefore, although the alloy strength is high, it has serious intergranular The corrosion tendency seriously restricts the application range of this series of alloys; after T7 overaging treatment, although the grain boundary precipitates are coarse in size and distributed discontinuously, which significantly improves the intergranular corrosion performance, the intragranular precipitates also seriously grow large, leading to a significant decrease in strength, and the strength potential of the alloy cannot be fully exploited

Method used

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  • Thermal treatment method for aluminum alloy
  • Thermal treatment method for aluminum alloy
  • Thermal treatment method for aluminum alloy

Examples

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Embodiment 1

[0021] Example 1: 6061 aluminum alloy rolled plate, solution treatment temperature 550°C, heat preservation for 1 hour, then aging at 180°C for 8h to peak T6 state. The tensile properties of 6061 aluminum alloy in this state are shown in Table 1, and the intergranular corrosion morphology is shown in the appendix figure 2 (a), transmission electron microscope observation see appendix image 3 (a).

Embodiment 2

[0022] Example 2: 6061 aluminum alloy solution treatment temperature is 550°C, heat preservation for 1 hour, the first stage is aged at 180°C for 2 hours, the second stage is aged at 165°C for 120 hours, and the third stage is aged at 180°C for 6 hours. The tensile properties of 6061 aluminum alloy in this state are shown in Table 1, and the intergranular corrosion morphology is shown in the appendix figure 2 (b), see attachment for transmission electron microscope observation image 3 (b).

Embodiment 3

[0023] Example 3: 6061 aluminum alloy rolled plate, solution treatment temperature 550°C, heat preservation for 1 hour, the first stage is aged at 240°C for 15 minutes, the second stage is aged at 130°C for 2400 hours, and the third stage is aged at 180°C 10h. The tensile and corrosion properties of 6061 aluminum alloy in this state are shown in Table 1.

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Abstract

The invention relates to a thermal treatment method which can improve the inter-crystalline corrosion resistance of 6000 series Al-Mg-Si-(Cu) aluminum alloy and does not reduce the tensile property of the alloy at the same time, and belongs to the technical field of thermal treatment of aluminum alloy. The method comprises the following steps: firstly, carrying out solid solution treatment for the 6000 series aluminum alloy at the temperature range of between 520 and 580 DEG C, preserving the heat for 15 to 240 minutes, quenching the aluminum alloy, and then carrying out primary ageing for 15 to 480 minutes at the temperature of between 180 and 240 DEG C; and carrying out secondary ageing for 24 to 2,400 hours at the temperature of between 130 and 170 DEG C, and finally ageing the aluminum alloy for 2 to 10 hours at the temperature of between 180 and 240 DEG C. Compared with the ageing of the conventional T6 peak value, the tensile property of the 6000 series aluminum alloy treated by the method is not reduced, and simultaneously the inter-crystalline corrosion resistance is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of aluminum alloys, and in particular relates to a three-stage aging method for improving the intergranular corrosion resistance of 6000 series aluminum alloys while ensuring that the tensile properties are not reduced. Background technique [0002] The 6000 series aluminum alloy has medium strength, good weldability, formability, and corrosion resistance, and is widely used in many fields such as aerospace, transportation, and construction. In order to obtain the highest strength, this series of aluminum alloys is often subjected to T6 peak aging. In this state, although the intragranular precipitates are fine and dispersed, the grain boundary precipitates are coarse in size and distributed continuously. Therefore, although the alloy strength is high, it has serious intergranular The corrosion tendency seriously restricts the application range of this series of alloys; after T7 overaging t...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 李海王芝秀潘道召曹大呼
Owner 溧阳常大技术转移中心有限公司
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