Method for surface modification and high strength connection of magnesium alloy and aluminum alloy

A technology for aluminum alloy surface and surface modification, applied in welding equipment, metal processing equipment, metal material coating technology, etc., can solve problems such as low strength of welded joints, difficulties in reliable connection, and difficult control of welding processes, etc., to eliminate The effect of pristine interface, small deformation and small residual stress

Inactive Publication Date: 2012-10-17
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the differences in physical and chemical properties of magnesium and aluminum dissimilar metals, it is very difficult to achieve reliable connection by general welding methods. The main problems in the direct welding of the two metals are: (1) Magnesium and aluminum are highly active and easy to contact with air. The oxygen in the solution reacts to form an inert oxide film on the surface. The existence of the oxide film is not conducive to the interdiffusion of the base metal atoms, which makes the welding process difficult to control. It is mainly manifested in the need to eliminate its influence at a higher temperature; (2 ) Magnesium and aluminum are easy to react with each other, and a large number of high-hardness brittle intermetallic compounds are formed in the interface area of ​​the welded joint and delamination occurs, resulting in low strength of the welded joint

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  • Method for surface modification and high strength connection of magnesium alloy and aluminum alloy
  • Method for surface modification and high strength connection of magnesium alloy and aluminum alloy
  • Method for surface modification and high strength connection of magnesium alloy and aluminum alloy

Examples

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Effect test

Embodiment 1

[0036] Surface modification treatment and vacuum diffusion solid phase connection are carried out on magnesium alloy and aluminum alloy. Among them, the magnesium alloy to be welded is pure magnesium with a diameter of Φ25×5mm Mg1, and the aluminum alloy to be welded is pure aluminum with a diameter of Φ25×5mm1060A. The thickness of the magnetron sputtering Ag interlayer is 1.5 μm, and the process conditions of diffusion bonding are: welding temperature 380°C, holding time 90min, and welding pressure 10MPa.

[0037] The specific steps are as follows (see figure 1 ):

[0038] 1. Magnesium alloy and aluminum alloy machining and surface coating modification treatment:

[0039] Magnesium alloys and aluminum alloys are processed into round sheets with ultra-precision surface grinders, and 1000 # , 1200 #SiC sandpaper and metallographic sandpaper No. 05, 06, and 07 were used to polish the surface of the circular slice to be welded, and polished with a high-precision polishing mac...

Embodiment 2

[0046] Surface modification treatment and vacuum diffusion solid phase connection are carried out on magnesium alloy and aluminum alloy. Among them, the magnesium alloy to be welded is pure magnesium with a diameter of Φ25×5mm Mg1, and the aluminum alloy to be welded is pure aluminum with a diameter of Φ25×5mm1060A. The magnetron sputtering Ag intermediate layer 7 has a thickness of 2.5 μm, and the diffusion bonding process conditions are: welding temperature 390° C., holding time 30 minutes, and welding pressure 5 MPa.

[0047] The specific steps are as follows (see figure 1 ):

[0048] 1. Magnesium alloy and aluminum alloy machining and surface coating modification treatment:

[0049] Magnesium alloys and aluminum alloys are processed into round sheets with ultra-precision surface grinders, and 1000 # , 1200 # SiC sandpaper and metallographic sandpaper No. 05, 06, and 07 were used to polish the surface of the circular slice to be welded, and polished with a high-precision...

Embodiment 3

[0056] Surface modification treatment and vacuum diffusion solid phase connection are carried out on magnesium alloy and aluminum alloy. Among them, the magnesium alloy to be welded is pure magnesium with a diameter of Φ25×5mm Mg1, and the aluminum alloy to be welded is pure aluminum with a diameter of Φ25×5mm1060A. The thickness of the Ag interlayer by magnetron sputtering is 2.5 μm, and the process conditions of diffusion bonding are: welding temperature 420°C, holding time 30min, and welding pressure 5MPa.

[0057] The specific steps are as follows (see figure 1 ):

[0058] 1. Magnesium alloy and aluminum alloy machining and surface coating modification treatment:

[0059] Magnesium alloys and aluminum alloys are processed into round sheets with ultra-precision surface grinders, and 1000 # , 1200 # SiC sandpaper and metallographic sandpaper No. 05, 06, and 07 were used to polish the surface of the circular slice to be welded, and polished with a high-precision polishing ...

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Abstract

The invention provides a method for surface modification and high strength connection of magnesium alloy and aluminum alloy. The method is as follows: carrying out surface modification on magnesium alloy and aluminum alloy by using the technology of magnetron sputtering and depositing a silver thin layer with micron thickness as a barrier layer and an active layer; and realizing high strength connection of the magnesium alloy and the aluminum alloy at a low temperature by using the technique of vacuum diffusion welding. The invention has the following advantages: coating modification enables surface oxidation resistance of the easily-oxidizable aluminum alloy and magnesium alloy to be improved; diffusion connection of the magnesium alloy and the aluminum alloy at a low temperature is realized for the first time by using the highly active silver thin layer; the silver thin layer changes the phase composition and microstructure of a magnesium/aluminum connection interface and prevents formation of a high-hardness brittle magnesium-aluminum intermetallic compound on the interface, and high strength Mg-Ag and Ag-Al intermetallic transition layers are formed and have a shear strength of 20 to 30 MPa, increased by nearly 4 times compared with a shear strength obtained through direct welding of magnesium aluminum. The method provided in the invention has the advantages of a simple process and high control precision; an obtained connecting piece has small deformation and residual stress.

Description

technical field [0001] The invention relates to the field of connecting magnesium alloys and aluminum alloys, in particular to a low-temperature high-strength connecting method for magnesium alloys and aluminum alloys. Background technique [0002] Aluminum is the metal element with the highest content in the earth's crust. Its strength is relatively high, which is close to or exceeds that of high-quality steel. At the same time, it has good plasticity and can be processed into various profiles. It has good electrical conductivity, thermal conductivity, and corrosion resistance. Aluminum alloys are widely used in aerospace, architectural decoration and other fields, especially in the automotive field. The application of aluminum alloy materials plays a very important role in reducing the weight of automobiles to reduce energy consumption, reduce environmental pollution, improve fuel economy of automobiles, and save limited resources. Magnesium alloy is considered to be the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/16B23K20/02B23K20/14B23K20/22B23K20/24
Inventor 张联盟王仪宇罗国强沈强李美娟王传彬
Owner WUHAN UNIV OF TECH
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