Method of metamorphosing hypo eutectic aluminum-silicon alloy by using rear earth Er

An aluminum-silicon alloy and hypoeutectic technology, which is applied in the field of aluminum alloy casting, can solve the problems of easy decay failure, easy generation of pores, and serious gas absorption tendency, etc., achieve shape and size optimization, overcome easy hydrogen evolution, and overcome easy decay Effect

Inactive Publication Date: 2015-12-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modification effect of Na element is good, it can make the flaky eutectic silicon phase fibrous, but it is easy to decay and fail.
Although Sr metamorphism has the advantages of long-term effect, good remelting property, and obvious metamorphic effect, it has a long incubation period, serious inhalation tendency, serious burning loss, and the tissue is prone to defects such as pores and shrinkage porosity.
Sb modification has the advantages of no decay, degassing, etc., but the effect of Sb modification is general, and the corresponding time is slow

Method used

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  • Method of metamorphosing hypo eutectic aluminum-silicon alloy by using rear earth Er
  • Method of metamorphosing hypo eutectic aluminum-silicon alloy by using rear earth Er
  • Method of metamorphosing hypo eutectic aluminum-silicon alloy by using rear earth Er

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1) In the process of batching hypoeutectic aluminum-silicon alloy, after preparing aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy and pure magnesium, the mass ratio of Si element in the alloy is 7wt.%, Cu element in the alloy The mass ratio is 0.05wt.%, the mass ratio of Mn element in the alloy is 0.08wt.%, and the mass ratio of Mg element in the alloy is 0.35wt.%. 2) After melting pure aluminum and all alloys in a resistance furnace, heating to 720°C; 3) use a refining agent composed of hexachloroethane and sodium fluorosilicate (mass ratio 1:1) for refining and slag removal; 4) at 720°C, add aluminum-magnesium alloy wrapped in aluminum foil into the solution , and keep warm for 5 minutes after stirring; 5) add Er element to the alloy in a certain form, fully stir, Er element is controlled at 0.05-0.5wt.% in the alloy quality, preferably 0.3wt.%; 7) After adding Er element, carry out Insulation treatment, pouring into a metal mold preheated at ...

Embodiment 2

[0027] The difference from Example 1 is that the mass ratio of Si element in the alloy is 3wt.%, the mass ratio of Cu element in the alloy is 0.05wt.%, the mass ratio of Mn element in the alloy is 0.1wt.%, and the Mg element is in The mass ratio in the alloy is 0.3wt.%. After adding the Er element, heat preservation treatment between 680-740°C, preferably 720°C, and pour into a metal mold preheated at 250°C after heat preservation treatment. Under this condition, the same modification effect as in Example 1 can be achieved.

Embodiment 3

[0029] The difference from Example 1 is that the mass ratio of Si element in the alloy is 5wt.%, the mass ratio of Cu element in the alloy is 0.1wt.%, and the mass ratio of Mn element in the alloy is 0.1wt.%. Adding Er element Finally, keep it at 720°C for 10-60 minutes, preferably 10 minutes, and pour it into a metal mold preheated at 250°C after heat preservation treatment. Under this condition, the same modification effect as in Example 1 can be achieved.

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Abstract

A method of metamorphosing hypo eutectic aluminum-silicon alloy by using rear earth Erbelongs to the technical field of aluminum alloy casting. The method comprises the steps of after melting aluminum-silicon alloy, adding a refining agent to refine to degas, then adding Er element, standing and performing heat preservation at the temperature of 720 DEG C, and forming by casting at a certain temperature. The earth Er element has good metamorphism, the metamorphism incubation period thereof is short, and the incubation period effective time is long. In addition, Er has the effects of dehydrogenizing and degassing, and reducing oxide inclusion on aluminum alloy, improves the structure of the alloy, and improves the mechanical property of the alloy.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a modification treatment method for a hypoeutectic aluminum-silicon alloy. Background technique [0002] Hypoeutectic Al-Si alloy has become one of the most widely used casting alloys due to its good casting fluidity, good air tightness, small shrinkage rate, and small hot cracking tendency. However, in the as-cast alloy, the eutectic silicon phase is distributed on the aluminum substrate in a lamellar form. The coarse lamellar silicon phase will severely split the alloy matrix, and it is easy to cause stress concentration at the tip and corners of the silicon phase. The mechanical properties of the alloy are significantly reduced. At present, in industrial production, the method of modification is generally adopted to eliminate the adverse effects of the silicon phase. Modification treatment is to improve the shape, size and distribution of eutectic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/04
Inventor 陈子勇侯潇柴丽华李贺杨贵芳乔勇聂祚仁
Owner BEIJING UNIV OF TECH
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