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Aluminium alloy homogenizing heat treatment method, aluminium alloy treated through homogenizing heat treatment method, aluminium alloy strengthening heat treatment method, and aluminium alloy treated through strengthening heat treatment method

A homogenization heat treatment and homogenization treatment technology, applied in the field of aluminum alloy, can solve the problem of weakening the strength and hardness of the alloy

Active Publication Date: 2017-09-22
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy will undergo a certain degree of recrystallization during hot deformation and subsequent heat treatment processes. The recrystallization structure has a great negative impact on the structure and properties of the alloy, weakening the strength and hardness of the alloy.

Method used

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  • Aluminium alloy homogenizing heat treatment method, aluminium alloy treated through homogenizing heat treatment method, aluminium alloy strengthening heat treatment method, and aluminium alloy treated through strengthening heat treatment method
  • Aluminium alloy homogenizing heat treatment method, aluminium alloy treated through homogenizing heat treatment method, aluminium alloy strengthening heat treatment method, and aluminium alloy treated through strengthening heat treatment method
  • Aluminium alloy homogenizing heat treatment method, aluminium alloy treated through homogenizing heat treatment method, aluminium alloy strengthening heat treatment method, and aluminium alloy treated through strengthening heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The components are: Zn5.0%, Mg2.0%, Cu0.4%, Mn0.3%, Cr0.1%, Ti0.01%, Zr0.1%, Si0.2%, Fe0.25%, The aluminum alloy with the balance of Al is subjected to double-stage homogenization treatment in a muffle furnace. After raising the temperature to 200°C at a heating rate of 2°C / min, keep it warm for 4 hours, then raise the temperature to 470°C at a heating rate of 4°C / min, and perform a 24-hour heat preservation and homogenization treatment.

[0065] After the above heat preservation is completed, the aluminum alloy is released from the furnace and air-cooled.

Embodiment 2

[0067] The same aluminum alloy was subjected to two-stage homogenization treatment according to the method of Example 1, the difference being that it was first kept at 250° C. for 4 hours, and then at 470° C. for 24 hours.

[0068] The TEM microstructure observation of the air-cooled alloy was carried out, and the results are as follows: Figure 6 shown.

[0069] And the alloy after the air cooling of the precipitates was analyzed by the energy spectrum of the transmission electron microscope. The results of the energy spectrum analysis are shown in the figure Figure 7 and Figure 8 As shown, it can be seen that the precipitate is Al 6 Mn and Al 7 Cr, and mark the corresponding precipitates in TEM.

[0070] Scanning electron microscope observation of the air-cooled alloy, SEM Figure 12 shown.

Embodiment 3

[0072] The same aluminum alloy was subjected to two-stage homogenization treatment according to the method of Example 1, the difference being that it was first kept at 300° C. for 4 hours, and then at 470° C. for 24 hours.

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Abstract

The invention provides an aluminium alloy homogenizing heat treatment method, aluminium alloy treated through the homogenizing heat treatment method, an aluminium alloy strengthening heat treatment method, and aluminium alloy treated through the strengthening heat treatment method. The aluminium alloy homogenizing heat treatment method comprises twin-stage homogenizing treatment on aluminium alloy including low-temperature homogenizing treatment and high-temperature homogenizing treatment, wherein the temperature of low-temperature homogenizing treatment is 200-300 DEG C, and the time is 3.5-8 hours; the temperature of high-temperature homogenizing treatment is 450-480 DEG C, and the time is 20-25 hours; and the aluminium alloy subjected to homogenizing heat treatment contains Mn and Cr. According to the invention, the manner combining the low-temperature homogenizing treatment with the high-temperature homogenizing treatment is adopted to treat aluminium alloy containing Mn and Cr elements so as to obtain Al6Mn and Al7Cr particles with uniform particle size and distribution, and Al6Mn and Al7Cr particles have a higher recrystallization restraining function to effectively reduce appearance of recrystallization texture during the following heat treatment process and prevent the strength and hardness of aluminium alloy from being weakened.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a homogenizing heat treatment method for aluminum alloys and the treated aluminum alloy, a strengthening heat treatment method and the treated aluminum alloy. Background technique [0002] Aluminum alloy is an alloy assembly with aluminum as the matrix element. The main alloying elements include copper, silicon, magnesium, zinc, manganese, and nickel, iron, titanium, chromium, lithium and other alloying elements. Aluminum alloys with a yield strength of more than 500MPa are called ultra-high-strength aluminum alloys, which are heat-treatable and strengthenable aluminum alloys based on AL-Zn-Mg-Cu and Al-Zn-Mg systems (referred to as 7xxx series aluminum alloys) alloy). Due to the advantages of high specific strength and hardness, good hot workability, excellent welding performance, high fracture toughness, and high stress corrosion resistance, ultra-high-strength aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053
Inventor 姜锋童蒙蒙
Owner CENT SOUTH UNIV
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