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Method for improving low-temperature mechanical property 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: 2021-02-09
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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  • Method for improving low-temperature mechanical property of cast Al-Si alloy
  • Method for improving low-temperature mechanical property of cast Al-Si alloy
  • Method for improving low-temperature mechanical property of cast Al-Si alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put pure Al and Al-Si master alloy into a graphite crucible, place the graphite crucible in an RGL-15-8 well-type resistance furnace, set the temperature of the resistance furnace to 750°C, and keep warm until pure Al and Al - The Si master alloy is completely melted, and the pure Mg and Al-50Fe master alloy are pressed into the resulting melting system with a bell jar, kept for 10 minutes, and the pure Mg and Al-50Fe master alloy are completely melted to obtain the first melt, the first The composition of the melt includes: silicon 7.0wt%, magnesium 0.30wt%, iron 0.13wt%, and the balance is Al;

[0039] The temperature of the first melt is lowered to 680° C., and an Al-Sr master alloy and an Al-10RE master alloy are added to the first melt so that the amount of Sr added is 0.3% of the mass of the first melt, RE The amount of addition is 0.2% of the mass of the first melt (the RE includes La and Ce, and the molar ratio of La and Ce is 1:2), after finishing the heat pres...

Embodiment 2

[0043] The Al-7Si-0.3Mg alloy was modified according to the method of Example 1 to obtain a modified Al-7Si-0.3Mg alloy, except that the amount of RE added was 0.4% of the mass of the first melt.

Embodiment 3

[0045] The Al-7Si-0.3Mg alloy was modified according to the method of Example 1 to obtain a modified Al-7Si-0.3Mg alloy, except that the amount of RE added was 0.6% of the mass of the first melt.

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Abstract

The invention provides a method for improving the low-temperature mechanical property of a cast Al-Si alloy, and belongs to the technical field of aluminum alloys. The method comprises the following steps that a molten material liquid of the Al-Si alloy is provided and marked as a first melt; under the condition of 650-680 DEG C, the first melt, an Al-Sr intermediate alloy and an Al-10RE intermediate alloy are mixed, heat preservation is carried out until the Al-Sr intermediate alloy and the Al-10RE intermediate alloy are completely molten, and a second melt is obtained, wherein the mass of Srin the Al-Sr intermediate alloy is 0.2-0.4% of the mass of the first melt, and the mass of RE in the Al-10RE intermediate alloy is 0.2-0.8% of the mass of the first melt; and the second melt is sequentially subjected to degassing refining and casting molding. The method is adopted for treating the cast Al-Si alloy, and the low-temperature mechanical property of the cast Al-Si alloy can be improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for improving the low-temperature mechanical properties of cast Al-Si alloys. Background technique [0002] Aluminum alloys can be divided into deformed aluminum alloys and cast aluminum alloys according to the process characteristics. Compared with wrought aluminum alloy, cast aluminum alloy has the advantages of short production cycle and low production cost. Among them, the cast Al-Si alloy has the advantages of high specific strength, low density, good corrosion resistance and processing performance, and is widely used in automobiles, aerospace and other fields. With the advancement of science and technology, cast Al-Si alloys are gradually applied in low-temperature environments, so the requirements for the mechanical properties of cast Al-Si alloys in low-temperature environments are getting higher and higher. The cast Al-Si alloy directly obtained by tra...

Claims

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Application Information

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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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