Nano Fe-Al powder electron beam modified aluminum alloy

An electron beam, aluminum alloy technology, applied in the field of aluminum alloy materials, can solve the problems of high friction factor, easy to strain, plastic deformation and so on

Inactive Publication Date: 2020-04-07
王洪伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum alloys have many disadvantages, such as: low hardness, easy to produce plastic deformation; high friction coefficient, large wear, easy to strain; difficult to lubricate, resulting in poor wear resistance of aluminum alloys, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0013] The raw materials for the preparation of nano-Fe-Al powder electron beam modified aluminum alloy include: ADC12 aluminum alloy with a test sample size of 40mm×40mm×40mm. The preparation steps of nano-Fe-Al powder electron beam modified aluminum alloy are as follows: electron beam scanning surface nano-alloying is a metallurgical process, and the alloy-strengthened nano-Fe powder and the matrix material meet the thermodynamic conditions of liquid solid fusion, so that they can be processed by electron beam scanning The solid-solution strengthening effect is achieved under the subsequent rapid solidification conditions, so that the nano-Fe powder can strengthen the aluminum matrix. Using the coating method, the center of the upper surface of the sample is milled into an annular groove with an inner diameter of 12 mm, an outer diameter of 18 mm, and a groove depth of 2 mm. First wash with acetone for 2 minutes to remove oxides on the surface of the aluminum alloy and dry i...

Embodiment example 2

[0015] After the electron beam treatment, the structure of the strengthened layer and the matrix changed significantly. After the electron beam surface alloyed, three regions were formed in the strengthened layer, which were the matrix region, the transition region and the alloyed region. The matrix structure is composed of eutectic and granular Si crystals. In the transition zone, that is, the remelting zone of the molten pool, the grains of the structure are relatively finer than those of the matrix structure. This is due to the rapid cooling of the transition zone due to the heat conduction of the matrix during the electron beam scanning process, making the Si crystal phase too late. It precipitates from the matrix and dissolves in the eutectic, resulting in relatively fine grains. After adding nano-Al-Fe mixed powder on the surface of aluminum alloy, the molten nano-Fe powder in the matrix forms a new α phase and α(Si+Al) binary eutectic; a small amount of coarse crystalli...

Embodiment example 3

[0017] As the distance from the surface increases, the hardness decreases gradually but is higher than that of the matrix. The thickness of the alloy layer in the strengthening area of ​​electron beam surface treatment is about 6mm, and the average hardness of the alloy layer is three times that of the base material. This is because the structure of the surface alloy layer is composed of new FeAl 3 and Fe 2 al 5 Phase composition, resulting in an increase in hardness. The grains of the melting zone are highly refined, resulting in non-equilibrium eutectic and needle-like β(Al 9 Si 2 Fe 2 ) compound, resulting in a higher microhardness than the matrix. When it is 10mm away from the surface and enters the matrix area, the hardness remains unchanged, which is consistent with the above microstructure characteristics.

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Abstract

The invention relates to a nano Fe-Al powder electron beam modified aluminum alloy. Nano alloying treatment is carried out on the surface of an aluminum alloy ADC12 by means of an electron beam scanning technique. The electron beam nano Al-Fe alloying can improve the hardness of an aluminum alloy material and enhance the wear resistance of the aluminum alloy material. Along with increase of nano Fe powder in mixed powder, alloy hard strengthening phases in an alloy layer are increased gradually, the hardness and wear resistance of the alloyed layer are also improved gradually, and the highesthardness can reach 800 HV, but cracks appear in tissues and the uniformity is poor. When the nano Fe powder content in the mixed powder is 50%, the hardness and wear resistance of the alloyed layer are relatively good, the heat-resistant hardness of the alloy can reach 300-400 HV at 675 K and the abrasion loss of the alloy is only 1 / 6 of that of an aluminum alloy substrate.

Description

[0001] Technical field [0002] The invention relates to an aluminum alloy material, in particular to a nanometer Fe-Al powder electron beam modified aluminum alloy. Background technique [0003] Aluminum alloys (including aluminum matrix composites) are widely used in automobiles, aviation, railways and passenger cars due to their excellent properties. However, aluminum alloys have many disadvantages, such as: low hardness, easy to produce plastic deformation; high friction coefficient, large wear, easy to strain; difficult to lubricate, resulting in poor wear resistance of aluminum alloys, etc. Improving the surface hardness and wear resistance of aluminum alloy can expand its wide application in new fields. Electron beam surface alloying is the use of electron beam surface modification technology to rapidly melt one or more alloying elements into the matrix, and use energy transformation and organizational change to obtain a surface alloy layer with special properties. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 王洪伟
Owner 王洪伟
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