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Method of using Mg to improve cracks in aluminum-silicon alloy surface

An aluminum-silicon alloy, surface crack technology, applied in metal material coating process, ion implantation plating, coating and other directions, can solve the problems of limiting the application range of eutectic aluminum-silicon alloy, micro-cracks on the surface of the alloy, etc. Improve the structure of the material, reduce the surface cracks and craters, and avoid the effect of oxidation

Inactive Publication Date: 2018-05-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the aluminum-silicon alloy piston materials used in China are mainly eutectic aluminum-silicon alloys. Beam treatment can significantly refine the primary silicon and its structure, which is beneficial to improve the surface properties, but due to the existence of brittle phase primary silicon, obvious microcracks appear on the surface of the alloy after electron beam treatment, which limits the eutectic aluminum to a certain extent. Application range of silicon alloy

Method used

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  • Method of using Mg to improve cracks in aluminum-silicon alloy surface
  • Method of using Mg to improve cracks in aluminum-silicon alloy surface
  • Method of using Mg to improve cracks in aluminum-silicon alloy surface

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Effect test

Embodiment 1

[0034] According to the mass percentage, the content of magnesium in the aluminum-silicon alloy is 7%, and the process steps are as follows:

[0035] (1) Alloy melting ingot

[0036] The raw materials are selected according to the chemical composition of Si 20%, Mg 7%, and the balance is Al, and the alloy is melted in a high-temperature resistance furnace under the protection of argon, and the melting temperature is 750-780°C. In the 304 stainless steel mold, obtain the magnesium-containing aluminum-silicon alloy ingot;

[0037] (2) Surface pretreatment

[0038] Wire-cut the aluminum-silicon alloy ingot containing Mg into small squares of 10*10*10, grind and polish one side of the small squares of 10*10*10, and clean the surface with an organic solvent;

[0039] (3) Electron beam surface modification

[0040] Place the aluminum-silicon alloy ingot after surface pretreatment in 6×10 -3 Under the vacuum condition of Pa, a high-current pulsed electron beam is applied to the s...

Embodiment 2

[0043] According to the mass percentage, the content of magnesium in the aluminum-silicon alloy is 5%, and the process steps are as follows:

[0044] (1) Alloy melting ingot

[0045] The raw materials are selected according to the chemical composition of Si 20%, Mg 5%, and the balance is Al, and the alloy is melted in a high-temperature resistance furnace under the protection of argon, and the melting temperature is 750-780°C. In the 304 stainless steel mold, obtain the magnesium-containing aluminum-silicon alloy ingot;

[0046](2) Surface pretreatment

[0047] Carry out wire-cutting on the aluminum-silicon alloy ingot containing Mg into small squares of 10*10*10, grind and polish one side of the small squares of 10*10*10, and clean the surface with an organic solvent;

[0048] (3) Electron beam surface modification

[0049] Put the surface pretreated aluminum-silicon-magnesium alloy sample under the vacuum condition of 6×10-3Pa, and apply a high-current pulsed electron bea...

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Abstract

The invention provides a method of using Mg to improve cracks in an aluminum-silicon alloy surface, and belongs to the technical field of material processing. The method comprises the following steps:preparing raw materials according to a formula, which comprises 20 wt% of Si, 5 to 7 wt% of Mg, and the balance being Al; smelting alloy in a high temperature resistance furnace under the protectionof argon, pouring liquid alloy into a mould made of 304 stainless steel; cutting a small cube (10*10*10) from the cast ingot, grinding and polishing one surface of the small cube (10*10*10), washing the surface by an organic solvent under the assistance of ultrasonic waves; placing the polished surface of the small cube (10*10*10) in vacuum (6*10<-6>Pa), and bombarding the polished surface by highcurrent pulsed electron beams. After Mg is added, the cracks and pits in the aluminum-silicon alloy surface are obviously reduced, at the same time, the method that uses a rare earth element namely Ce to eliminate micro-cracks is improved, and the cost for eliminating micro-cracks is greatly reduced, compared with that of the method using Ce.

Description

technical field [0001] The invention belongs to the technical field of material processing, in particular to a method for improving surface cracks of aluminum-silicon alloys by using Mg element. Background technique [0002] As a new type of high-density energy source, the high-current pulsed electron beam uses accelerated electrons as the energy carrier. During the processing, a large amount of energy is deposited in the thin layer of the material surface within a very short time range of the microsecond level (~ 10μm range), forming a very high temperature gradient (~10 7 K / m), so a series of physical processes such as melting, vaporization and melt eruption occurred in the surface layer of the material. After the pulsed electron beam is over, the heat is quickly dissipated due to the chilling effect of the material matrix. As a result, under the rapid cooling of the electron beam, the surface layer obtains a metastable structure (such as supersaturated solid solution, na...

Claims

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Application Information

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IPC IPC(8): C23C14/30C23C14/16
CPCC23C14/30C23C14/16
Inventor 高波徐宁王艺璇胡成龙胡亮刘畅周英伟张德松邢鹏飞娄太平
Owner NORTHEASTERN UNIV