Treatment method for improving surface strength of Al-Mg alloy

A technology of surface strength and treatment method, which is applied in the field of treatment to improve the surface strength of Al-Mg alloys, can solve the problems of easy cracking and obvious problems of materials, and achieve the effects of improving mechanical properties, prolonging life, and improving surface hardness

Inactive Publication Date: 2020-09-15
JIANGSU UNIVERSITY OF TECHNOLOGY
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  • Description
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Problems solved by technology

[0005] In order to solve the technical problem that the material is easy to crack due to the obvious residual stress and microcracks on the surface of Al-Mg alloy materials after friction stir processing, a treatment method for improving the surface strength of Al-Mg alloy materials is provided.

Method used

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  • Treatment method for improving surface strength of Al-Mg alloy

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Embodiment 1

[0024] A treatment method for improving the surface strength of Al-Mg series alloy——5052 aluminum alloy, comprising the following sequential steps:

[0025] (1) Take a 5052 aluminum alloy sheet material with a length of 120mm, a width of 60mm, and a thickness of 6mm. The 5052 aluminum alloy is polished and peeled at room temperature. Soak in 20g / L nitric acid for 2 minutes, then wash with alcohol and dry;

[0026] (2) After the step (1) is completed, place the 5052 aluminum alloy sheet in a heating furnace at 450°C for 30 minutes for preheating;

[0027] (3) Immediately perform friction stir processing on the 5052 aluminum alloy sheet after the preheating treatment. The feed speed of the alloy sheet is 35mm / min;

[0028] (4) Grinding the burrs existing after the friction stir addition treatment, and finally performing a cold rolling forming treatment with a reduction of 50%.

Embodiment 2

[0030] A treatment method for improving the surface strength of an Al-Mg alloy—a 6061 aluminum alloy, comprising the following sequential steps:

[0031] (1) Take a 6061 aluminum alloy sheet with a length of 120 mm, a width of 60 mm, and a thickness of 6 mm. At room temperature, the 5052 aluminum alloy is polished and peeled. First, soak it in a sodium hydroxide solution with a concentration of 50 g / L for 2 minutes. Soak in 30g / L nitric acid for 1 minute, then wash with alcohol and dry;

[0032] (2) After the step (1) is completed, the 6061 aluminum alloy sheet is placed in a heating furnace at 480° C. for 40 minutes for preheating;

[0033] (3) Immediately perform friction stir processing on the 6061 aluminum alloy sheet after the preheating treatment. The inclination angle of the stirring head is 2°, the rotation speed of the stirring head is 1200r / min, and the depression of the shoulder of the stirring head is 0.5mm. The feed speed of the alloy sheet is 50mm / min;

[0034]...

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Abstract

The invention relates to a treatment method for improving the surface strength of an Al-Mg alloy. The treatment method comprises the following sequential steps that (1) an Al-Mg alloy material is subjected to surface treatment, cleaning and drying are conducted; (2) after the step (1) is completed, the Al-Mg series alloy material is placed in a heating furnace at the temperature of 450-500 DEG C,heat preservation is conducted for 30-40 minutes, and preheating treatment is conducted; (3) friction stir processing treatment is immediately conducted after the preheating treatment is completed; and (4) finally rolling forming treatment is conducted. According to the treatment method, surface layer grains can be further refined, the purpose of improving the surface strength of the Al-Mg alloy material is achieved, the service life of a stirring head can be further prolonged, the production efficiency of stirring friction machining treatment is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of alloy material processing, in particular to a treatment method for improving the surface strength of Al-Mg alloys. Background technique [0002] Since magnesium can form high-strength alloys with aluminum, copper, zinc and other metals, magnesium is an important alloying element. Especially in the application of aluminum alloy, adding metal magnesium to aluminum alloy can make the alloy lighter and higher in specific strength. In Al-Mg series alloys (5000 series aluminum alloys), Al-Mg-Si series alloys (6000 series aluminum alloys), and Al-Zn-Mg series alloys (7000 series aluminum alloys), magnesium is the main added element, and is widely used Add to. Other alloys such as Al-Cu-based alloys (2000-series aluminum alloys) and Al-Mn-based alloys (3000-series aluminum alloys) do not use magnesium as a main additive element in part, and a small amount of magnesium is also added. [0003] The main reason fo...

Claims

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Application Information

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IPC IPC(8): C22F1/047
CPCC22F1/047
Inventor 刘清陈王泽辉杨林王璐乙姣姣徐明沁
Owner JIANGSU UNIVERSITY OF TECHNOLOGY
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