Multi-stage aging treatment method for aluminium-zinc-magnesium-copper 7000 series alloy thick plates

A technology of graded aging and treatment method, applied in the field of graded aging treatment of zinc, copper 7000 series alloy thick plate, aluminum, magnesium, can solve the problems of low fracture toughness, cracking sensitivity, etc., to improve fracture toughness, reduce sensitivity, improve The effect of mechanical properties

Inactive Publication Date: 2015-01-28
DALIAN HUICHENG ALUMINUM
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Problems solved by technology

However, there are still deficiencies in that the quenched and tempered state is sensitive to stress corrosion cracking and low fracture toughness.

Method used

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  • Multi-stage aging treatment method for aluminium-zinc-magnesium-copper 7000 series alloy thick plates

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Embodiment Construction

[0013] Embodiment, with reference to accompanying drawing, a kind of aluminum, zinc, magnesium, copper 7000 series alloy thick plate graded aging treatment method, it is characterized in that taking the following steps:

[0014] a. Put aluminum, zinc, magnesium, copper 7000 series alloy thick plates in box type quenching furnace 1 for quenching treatment, the quenching temperature is raised to 477±3°C, and the holding time is 80~100min; quenching transfer time t1≤30~ 50s;

[0015] b. the aluminum, zinc, magnesium, copper 7000 series alloy thick plate after quenching treatment is cooled in the water cooling container 2;

[0016] c. Put the cooled aluminum, zinc, magnesium, and copper 7000 series alloy thick plates in the aging furnace 3 for three-stage aging treatment. The first-stage aging temperature is 120±3°C, and the holding time is 4~6h; the second-stage The aging temperature is 155±3℃, and the holding time is 24~28h; the third aging temperature is 120±3℃, and the holdin...

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Abstract

The invention belongs to a multi-stage aging treatment method for aluminium-zinc-magnesium-copper 7000 series alloy thick plates. The multi-stage aging treatment method is characterized by comprising the following steps of (a) putting the aluminium-zinc-magnesium-copper 7000 series alloy plates in a box type quenching furnace (1) to carry out quenching treatment, wherein a quenching temperature is increased to 477+/-3 DEG C and a retention time is 80-100 min; (b) cooling the quenched in a water cooler (2); (c) carrying out multi-stage aging treatment in an aging furnace (3), wherein a first stage aging temperature is 120+/-3 DEG C, a second stage aging temperature is 155+/-3 DEG C and a third stage aging temperature is 120+/-3 DEG C; and (d) processing into samples, stretching the samples on an electronic universal testing machine (4), observing microstructures and detecting changes of crystal grains under an optical microscope (5), and determining conductivity on an conductivity meter (6). The aluminium-zinc-magnesium-copper 7000 series alloy thick plates treated by the method increase mechanical properties of aluminium alloy materials and obviously increase fracture toughness.

Description

technical field [0001] The invention belongs to a metal treatment method, in particular to a classification aging treatment method for aluminum, zinc, magnesium and copper 7000 series alloy thick plates. Background technique [0002] The 7000 series aluminum alloys of aluminum, zinc, magnesium and copper in the United States are the earliest and still widely used super-duralumin in the aviation industry. There were stereotyped products as early as the 1940s, and they were already in the United States in the early 1950s. Registered with the Aluminum Association. At that time, in order to obtain high-strength structural materials, the peak aging system was mainly used, but the materials in this quenched and tempered state were very sensitive to stress corrosion cracking, and the fracture toughness was also very low. Therefore, the improvement of the stress corrosion resistance (SCR) of 7000 series aluminum alloys has always been paid great attention. In order to solve the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053
CPCC22F1/053C22F1/002
Inventor 杨晓光焦兴贵许晨玲
Owner DALIAN HUICHENG ALUMINUM
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