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Aging treatment method for improving toughness of Al-Zn-Mg-Cu aluminum alloy, high-toughness aluminum alloy and preparation method thereof

A technology of aging treatment and three-stage aging treatment, which is applied in the field of aluminum alloy, can solve the problems of poor fracture toughness and corrosion resistance, reduce material fracture toughness, and decrease alloy strength, so as to improve strength performance, improve fracture toughness, and reduce difficulty Effect

Active Publication Date: 2020-05-08
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, increasing the content of Zn and Mg will cause a large amount of Zn and Mg to precipitate on the grain boundary, reducing the fracture toughness of the material
[0004] Al-Zn-Mg-Cu series aluminum alloys belong to wrought aluminum alloys that can be treated and strengthened. The strength of the single-stage aging treatment is the highest, but its fracture toughness and corrosion resistance are poor; although the double-stage aging treatment improves the fracture toughness of the alloy and corrosion resistance, but the strength of the alloy is reduced by 10-15%

Method used

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  • Aging treatment method for improving toughness of Al-Zn-Mg-Cu aluminum alloy, high-toughness aluminum alloy and preparation method thereof
  • Aging treatment method for improving toughness of Al-Zn-Mg-Cu aluminum alloy, high-toughness aluminum alloy and preparation method thereof
  • Aging treatment method for improving toughness of Al-Zn-Mg-Cu aluminum alloy, high-toughness aluminum alloy and preparation method thereof

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preparation example Construction

[0045] The present invention provides a method for preparing a high-strength and tough Al-Zn-Mg-Cu aluminum alloy, which includes the following steps: sequentially smelting, casting, homogenizing, and solidifying raw materials corresponding to the Al-Zn-Mg-Cu aluminum alloy composition. Solution treatment and aging treatment to obtain high strength and toughness Al-Zn-Mg-Cu aluminum alloy;

[0046] The method adopted for the aging treatment is the aging treatment method described in the above technical solution.

[0047] The invention melts the raw materials corresponding to the Al-Zn-Mg-Cu aluminum alloy composition to obtain a melt. In the present invention, the raw materials preferably include pure metallic aluminum, pure metallic magnesium, pure metallic zinc, and Al-Cu master alloy. When the Al-Zn-Mg-Cu aluminum alloy further includes Cr, Zr, and Ti, the raw material preferably further includes Al-Cr master alloy, Al-Zr master alloy and Al-Ti master alloy. The present invent...

Embodiment 1

[0067] according to figure 1 In the process shown, the solid solution alloy obtained in Comparative Example 1 is subjected to three-stage aging treatment. The specific implementation steps are as follows: the first-stage aging is raised from room temperature to 130°C, the heating rate is 10°C / min, and the temperature is kept for 24 hours; The aging is increased from 130°C to 210°C with the furnace at a heating rate of 10°C / min, holding for 15 minutes, and cooling to room temperature; the third-stage aging increases the resulting alloy from room temperature to 170°C at a heating rate of 10°C / min. Keep for 24h and cool to room temperature. After three-stage aging treatment, the alloy was subjected to microhardness and tensile tests. The results are shown in Table 1. The TEM picture of the alloy after three-level aging is as follows Figure 5 Shown.

Embodiment 2

[0069] according to figure 1 In the process shown, the solid solution alloy obtained in Comparative Example 2 is subjected to three-stage aging treatment. The specific implementation steps are as follows: the first-stage aging is increased from room temperature to 130°C, the heating rate is 10°C / min, and the temperature is kept for 24h; The aging is increased from 130°C to 210°C with the furnace at a heating rate of 10°C / min, holding for 15 minutes, and cooling to room temperature; the third-stage aging increases the resulting alloy from room temperature to 170°C at a heating rate of 10°C / min. Keep for 24h and cool to room temperature. After three-stage aging treatment, the alloy was subjected to microhardness and tensile tests. The results are shown in Table 1. The SEM picture of the alloy after three-stage aging is as follows Image 6 As shown, the TEM photo is as Figure 7 Shown.

[0070] Table 1 Strength and toughness of the alloys obtained in Comparative Examples 1-2 and E...

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Abstract

The invention relates to the technical field of aluminum alloys, in particular to an aging treatment method for improving the toughness of an Al-Zn-Mg-Cu aluminum alloy, a high-toughness aluminum alloy and a preparation method thereof. The aging treatment method provided by the invention comprises the following steps that three stages of aging treatment are carried out on the Al-Zn-Mg-Cu aluminumalloy; the Al-Zn-Mg-Cu aluminum alloy is an Al-Zn-Mg-Cu aluminum alloy subjected to solution treatment; the temperature of the first-stage aging treatment is 120-130 DEG C, and the heat preservation time is 22-26 h; the temperature of the second-stage aging treatment is 200-220 DEG C, and the heat preservation time is 10-20 min; and the temperature of the third-stage aging treatment is 160-170 DEGC, and the heat preservation time is 22-26 h. The alloy obtained after the three stages of aging treatment has good strength and fracture toughness at the same time.

Description

Technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to an aging treatment method for improving the strength and toughness of Al-Zn-Mg-Cu aluminum alloys, a high-strength and toughness aluminum alloy and a preparation method thereof. Background technique [0002] Al-Zn-Mg series aluminum alloys are called high-strength aluminum alloys because of their excellent mechanical properties. Scientists from various countries have developed Al-Zn-Mg-Cu series aluminum alloys with high corrosion resistance by adding Cu elements to Al-Zn-Mg alloys. It has excellent comprehensive properties and is widely used in the aerospace field. The main structural materials in the field. [0003] The world-class problem in Al-Zn-Mg-Cu aluminum alloy research and development is the contradiction between strength and fracture toughness. If the content of Zn and Mg is increased, the density of the intracrystalline precipitated phase will increase and the str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C1/02C22C21/10
CPCC22C1/026C22C21/10C22F1/053
Inventor 顾江龙杨寿亮高敏杰
Owner YANSHAN UNIV
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