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The design of laminated composite interlayers introduces a method for joining magnesium alloys to aluminum alloys

A composite intermediate layer and connection method technology, applied in the field of connection between magnesium and aluminum, to achieve the effect of reducing oxidation, reducing connection difficulty and shortening the cycle

Active Publication Date: 2018-05-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the design of magnesium and aluminum dissimilar metals and the addition of composite intermediate layers, and the activation of fast connection connections at low temperatures have not been reported.

Method used

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  • The design of laminated composite interlayers introduces a method for joining magnesium alloys to aluminum alloys
  • The design of laminated composite interlayers introduces a method for joining magnesium alloys to aluminum alloys
  • The design of laminated composite interlayers introduces a method for joining magnesium alloys to aluminum alloys

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Effect test

Embodiment 1

[0028] figure 1 It is a process flow diagram of the present invention. The magnesium alloy to be welded is MB2 magnesium alloy with a size of Φ25mm×5mm, the aluminum alloy to be welded is LY12 aluminum alloy with a size of Φ25mm×5mm, the size of silver foil is Φ25mm×30μm, and the CuNi alloy deposited by magnetron sputtering Cu atoms accounted for 50% (at%), and the film thickness was 1.5 μm. Diffusion welding process conditions are: welding temperature 400 ℃, welding pressure 5MPa, holding time 600s.

[0029] The specific steps are as follows:

[0030] 1. Machining and surface cleaning of raw material magnesium alloy and aluminum alloy:

[0031]Magnesium alloy and aluminum alloy are processed into circular slices with ultra-precision surface grinder, and the surface to be welded is polished with 1000#, 1500#, 2000# SiC sandpaper before welding, and then polished with a high-precision polishing machine. The silver foil and the polished magnesium-aluminum alloy were ultrason...

Embodiment 2

[0039] The magnesium alloy to be welded is MB2 magnesium alloy with a size of Φ25mm×5mm, the aluminum alloy to be welded is LY12 aluminum alloy with a size of Φ25mm×5mm, the size of silver foil is Φ25mm×30μm, and the CuNi alloy deposited by magnetron sputtering Cu atoms accounted for 50% (at%), and the film thickness was 1.5 μm. Diffusion welding process conditions are: welding temperature 380 ℃, welding pressure 5MPa, holding time 600s.

[0040] The specific steps are as follows:

[0041] 1. Machining and surface cleaning of raw material magnesium alloy and aluminum alloy:

[0042] Magnesium alloy and aluminum alloy are processed into circular slices with ultra-precision surface grinder, and the surface to be welded is polished with 1000#, 1500#, 2000# SiC sandpaper before welding, and then polished with a high-precision polishing machine. The silver foil and the polished magnesium-aluminum alloy were ultrasonically cleaned in an organic solvent for 5 minutes.

[0043] 2. ...

Embodiment 3

[0050] The magnesium alloy to be welded is MB2 magnesium alloy with a size of Φ25mm×5mm, the aluminum alloy to be welded is LY12 aluminum alloy with a size of Φ25mm×5mm, the size of silver foil is Φ25mm×30μm, and the CuNi alloy deposited by magnetron sputtering Cu atoms accounted for 50% (at%), and the film thickness was 1.5 μm. Diffusion welding process conditions are: welding temperature 420 ℃, welding pressure 5MPa, holding time 600s.

[0051] The specific steps are as follows:

[0052] 1. Machining and surface cleaning of raw material magnesium alloy and aluminum alloy:

[0053] Magnesium alloy and aluminum alloy are processed into circular slices with ultra-precision surface grinder, and the surface to be welded is polished with 1000#, 1500#, 2000# SiC sandpaper before welding, and then polished with a high-precision polishing machine. The silver foil and the polished magnesium-aluminum alloy were ultrasonically cleaned in an organic solvent for 5 minutes.

[0054] 2. ...

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Abstract

The invention provides a method for introducing the design of laminated compound interlayers to enable magnesium alloy and aluminium alloy to be connected. The method comprises the steps that first, CuNi alloy thin films are deposited on the surface of the magnesium alloy and the surface of the aluminium alloy to be used as obstructing interlayers for preventing surface oxidation of aluminium and magnesium matrixes and intermetallic compound generation; then Ag is added between CuNi alloy thin film layers to lower the connecting temperature of a CuNi interlayer, and a CuNi-Ag-CuNi laminated compound interlayer is formed; and then a to-be-connected magnesium alloy piece and a to-be-connected aluminium alloy piece of the compound interlayer are assembled and are subjected to heat preservation for 0-750 s at the temperature of 380-420 DEG C. According to the method, the compound interlayer avoids the generation of Mg-Al-based intermetallic compounds with connecting interface brittleness and other intermetallic compounds; an electric field activation connecting technology is adopted, so that quick low-temperature and high-strength welding of the magnesium alloy and the aluminium alloy is achieved under vacuum, the connecting temperature is lowered, the connecting technology cycle is shortened, and the reliability of connecting joints is improved.

Description

technical field [0001] The invention relates to the field of connection between magnesium and aluminum, in particular to a design and addition of a CuNi-Ag-CuNi laminated composite intermediate layer structure, and a low-temperature, fast and high-strength connection between magnesium alloy and aluminum alloy using electric field activation connection technology method. Background technique [0002] Both magnesium and aluminum are non-ferrous light metals, and both have better characteristics than other non-ferrous metals, steel and other materials. The density of aluminum is small, only 2.7g / cm 3 ; High specific strength, specific stiffness, excellent electrical and thermal conductivity; good corrosion resistance and plastic processing performance and other advantages. Magnesium resources are very rich, and the total reserves are estimated to be more than 100 tons; the specific strength of most magnesium alloys is significantly higher than that of aluminum alloys and stee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/14B23K20/16B23K20/233B23K20/24B23K103/18
CPCB23K20/001B23K20/14B23K20/16B23K20/2333B23K20/24
Inventor 罗国强饶梅王锦张联盟沈强王传彬张建李美娟
Owner WUHAN UNIV OF TECH
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