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A method for improving low-temperature mechanical properties of cast al-si alloy

An al-si, alloy technology, applied in the field of aluminum alloy, can solve the problem of low plasticity

Active Publication Date: 2022-02-25
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cast Al-Si alloy directly obtained by traditional melting and casting method has high strength in low temperature environment, but low plasticity

Method used

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  • A method for improving low-temperature mechanical properties of cast al-si alloy
  • A method for improving low-temperature mechanical properties of cast al-si alloy
  • A method for improving low-temperature mechanical properties of cast al-si alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Pure Al and Al-Si intermediate alloy was placed in a graphite crucible, and the graphite crucible was placed in the RGL-15-type well resistant furnace, and the temperature of the electric resistance furnace was set to 750 ° C, heat insulation to pure Al and Al The -si intermediate alloy is completely melted, and the pure Mg and Al-50FE intermediate alloy is pressed into the resulting melt system, and the incubation of 10 min, pure Mg and Al-50FE is completely melted to obtain the first melt, the first The melt components include: silicon 7.0% by weight, magnesium 0.30 wt%, iron 0.13 wt%, and margin is Al;

[0039] The first melt is lowered to 680 ° C, and the Al-SR intermediate alloy and the Al-10 RE intermediate alloy are added to the first melt, so that the SR is added to 0.3%, RE The addition amount is 0.2% of the first melt mass (the RE includes La and Ce, the molar ratio of the La and CE of 1: 2), plus insulation to Al-SR in the middle of Al-10RE The alloy is completel...

Embodiment 2

[0043] The Al-7Si-0.3 mg alloy was evolved in accordance with the method of Example 1, and the Al-7Si-0.3 mg alloy treatment treated was obtained, and the amount of RE added was 0.4% of the first melt mass.

Embodiment 3

[0045] The Al-7Si-0.3 mg alloy was evolved in accordance with the method of Example 1 to obtain a deterioration of Al-7Si-0.3 mg alloys, and the amount of RE is 0.6% of the first melt mass.

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Abstract

The invention provides a method for improving the low-temperature mechanical properties of cast Al-Si alloys, belonging to the technical field of aluminum alloys. The method provided by the present invention includes the following steps: providing a molten material liquid of Al-Si alloy, which is recorded as the first melt; The 10RE master alloy is mixed, and the heat preservation is completely melted to the Al-Sr master alloy and the Al-10RE master alloy to obtain a second melt; the quality of Sr in the Al-Sr master alloy is 0.2 of the first melt quality. ~0.4%, the mass of RE in the Al-10RE master alloy is 0.2-0.8% of the mass of the first melt; the second melt is degassed and refined and casted in sequence. By adopting the method provided by the invention to process the cast Al-Si alloy, the low-temperature mechanical properties of the cast Al-Si alloy can be improved.

Description

Technical field [0001] The present invention relates to the field of aluminum alloy, and more particularly to a method of improving low temperature resistance performance of cast Al-Si alloy. Background technique [0002] The aluminum alloy can be divided into deformable aluminum alloy and cast aluminum alloy according to process characteristics. Compared with deformance aluminum alloys, it has the advantage of short and low production costs than deformance aluminum alloys. Among them, the casting Al-Si alloy has the advantages of high strength, low density, good corrosion resistance and processing performance, widely used in automobiles, aerospace and other fields. With the advancement of technology, casting Al-Si alloys are gradually applied to low temperature environments, and thus the mechanical properties of cast Al-Si alloy in low temperature environments are increasing. The cast Al-Si alloy directly obtained by traditional smelt casting is high in the low temperature envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/04
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 李润霞张惠帝郝建飞郑黎卞健从陈斌邹烜姜雄华于宝义
Owner DONGGUAN UNIV OF TECH
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