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Al-Si-Nd rare-earth cast aluminum alloy and preparation method thereof

A casting aluminum alloy, al-si-nd technology, applied in the field of aluminum-silicon alloy, can solve the problems that the influence of Al-Si casting aluminum alloy has not been reported, and achieve the effect of no three wastes pollution, simple process and improved shape

Inactive Publication Date: 2013-01-16
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Research on rare earth aluminum alloys is increasing at home and abroad, but the effect of rare earth Nd as a refining agent and modifier on the structure and properties of Al-Si cast aluminum alloys has not been reported, so it has great research value

Method used

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  • Al-Si-Nd rare-earth cast aluminum alloy and preparation method thereof
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Examples

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Embodiment 1

[0014] Implementation Example 1: First, add Al-10Si (mass fraction) alloy into a graphite crucible, and melt the alloy in a resistance furnace at a melting temperature of 760°C. After the metal is completely melted, keep it warm for 20 minutes, add a slag remover, and stir. Remove slag, and then add hexachloroethane wrapped in aluminum foil for degassing and refining. After standing still, cast it into a metal mold to obtain an Al-Si alloy ingot, and the casting temperature is 710°C.

Embodiment 2

[0015] Implementation example 2: Al-11Si alloy is added to a graphite crucible, heated in a resistance furnace to melt, and rare earth Nd particles with an average diameter of 20um are added, wherein the rare earth element Nd accounts for 0.1% of the total weight of the alloy. The above alloy melt was kept at 760° C. for 10 minutes and then stirred for 3 minutes at a stirring speed of 40 rpm, and then kept for 20 minutes. Finally, the above alloy melt was cast and sampled when the melt temperature dropped to 700°C after degassing and refining.

Embodiment 3

[0016] Implementation example 3: Al-12Si alloy is added to a graphite crucible, heated in a resistance furnace until melted, and rare earth Nd particles with an average diameter of 40um are added, wherein the rare earth element Nd accounts for 0.2% of the total weight of the alloy. The above alloy melt was kept at 730° C. for 15 minutes and then stirred for 5 minutes at a stirring speed of 50 rpm, and then kept for 15 minutes. Finally, the above alloy melt was cast and sampled when the melt temperature dropped to 710°C after degassing and refining.

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Abstract

The invention discloses Al-Si-Nd rare-earth cast aluminum alloy and a preparation method thereof. The method comprises the following steps of: keeping the temperature of an alloy melt for 10 to 15 minutes, stirring for 3 to 5 minutes at the speed of 40 to 50 revolutions / minute, and keeping the temperature for 10 to 15 minutes; and degassing and refining the alloy melt, cooling the melt until the temperature is reduced to be 700 to 710 DEG C, and casting for sampling. The Al-Si-Nd rare-earth cast aluminum alloy has the advantages that due to the addition of rare earth Nd, the form of a silicon phase in the alloy can be improved obviously, and alpha-phase tissue can also be refined, so that massive primary silicon is eliminated, and the shape of eutectic silicon is changed into dotted shape or short rod shape from the thick needle shape. The method is simple in process, safe, reliable and convenient to operate, and the pollution of waste water, waste gas and industrial residues is avoided.

Description

technical field [0001] The invention relates to an aluminum-silicon alloy, in particular to an Al-Si-Nd rare earth cast aluminum alloy and a preparation method thereof. Background technique [0002] As a typical lightweight material in metal materials, aluminum alloy has excellent characteristics such as high strength, low density, high fracture toughness, and high stress corrosion resistance, and is widely used in the fields of machinery, chemical industry, automobile, construction, aviation, and aerospace . For aluminum alloy ingots, refining grains can make the internal structure uniform, reduce segregation, improve plasticity, and prevent defects such as cracks and shrinkage cavities. [0003] ZL102 aluminum alloy has excellent casting performance, no thermal cracking and loose tendency, and high air tightness. It has low density and good corrosion resistance. It can be used in environments subject to atmospheric and seawater corrosion, and can withstand the corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/02C22C1/06
Inventor 胡志闫洪
Owner NANCHANG UNIV
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