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A kind of high strength and toughness casting aluminum alloy and preparation method thereof

A technology for casting aluminum alloys and aluminum alloys, which is applied in the field of aluminum alloy manufacturing, can solve problems such as poor casting performance, and achieve the effects of increased strength, broad market application value, and high strength

Active Publication Date: 2017-12-15
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with Al-Si series cast aluminum alloys, the existing Al-Cu series, Al-Mg series and Al-Zn series cast aluminum alloys have poor casting properties due to the low Si content. Aluminum alloys can usually only cast castings with relatively simple shapes

Method used

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  • A kind of high strength and toughness casting aluminum alloy and preparation method thereof
  • A kind of high strength and toughness casting aluminum alloy and preparation method thereof
  • A kind of high strength and toughness casting aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The high-strength and toughness cast aluminum alloy of the present invention contains Si 4.5%, Mg 1.5%, Cu 1.5%, Zr 0.01%, B0.002%, Eu 0.01%, Re 0.1%, and the rest is Al and unavoidable impurities, The composition and mass percentage of Re are: Tb 19%, Dy 12%, Ho 31%, Tm 13%, Yb 17%, Lu 8%. Its preparation method is as follows:

[0026] The first step: select Al-5Zr-1B alloy, Al-10Eu alloy and aluminum ingot with a purity of 99.7%, 99.9% instant silicon, 99.85% magnesium ingot, 99.99% electrolytic copper and 99.9% mixed heavy rare earth Re As raw materials, the list of ingredients is as follows:

[0027]

[0028] Step 2: Heat and melt the aluminum ingot at 770°C, add instant silicon, magnesium ingot and electrolytic copper, stir and melt to form aluminum alloy liquid;

[0029] The third step: using hexachloroethane to refine the aluminum alloy liquid, after removing slag, add Al-5Zr-1B alloy, Al-10Eu alloy and mixed heavy rare earth Re, and stir to make the composi...

Embodiment 2

[0034] The high-strength and tough cast aluminum alloy of the present invention contains Si 5.5%, Mg 2.0%, Cu 2.0%, Zr 0.015%, B0.003%, Eu 0.02%, Re 0.2%, and the rest is Al and unavoidable impurities, The composition and mass percentage of Re are: Tb 19%, Dy 12%, Ho 31%, Tm 13%, Yb 17%, Lu 8%. Its preparation method is as follows:

[0035] The first step: select Al-5Zr-1B alloy, Al-10Eu alloy and aluminum ingot with a purity of 99.7%, 99.9% instant silicon, 99.85% magnesium ingot, 99.99% electrolytic copper and 99.9% mixed heavy rare earth Re As raw materials, the list of ingredients is as follows:

[0036]

[0037] Step 2: Heat and melt the aluminum ingot at 780°C, add instant silicon, magnesium ingot and electrolytic copper, stir and melt to form aluminum alloy liquid;

[0038] The third step: using hexachloroethane to refine the aluminum alloy liquid, after removing slag, add Al-5Zr-1B alloy, Al-10Eu alloy and mixed heavy rare earth Re, and stir to make the compositio...

Embodiment 3

[0043] The high-strength and tough cast aluminum alloy of the present invention contains Si 6.5%, Mg 2.5%, Cu 2.5%, Zr 0.02%, B0.004%, Eu 0.03%, Re 0.03%, and the rest is Al and unavoidable impurities, The composition and mass percentage of Re are: Tb 19%, Dy 12%, Ho 31%, Tm 13%, Yb 17%, Lu 8%. Its preparation method is as follows:

[0044] The first step: select Al-5Zr-1B alloy, Al-10Eu alloy and aluminum ingot with a purity of 99.7%, 99.9% instant silicon, 99.85% magnesium ingot, 99.99% electrolytic copper and 99.9% mixed heavy rare earth Re As raw materials, the list of ingredients is as follows:

[0045]

[0046] Step 2: Heat and melt the aluminum ingot at 790°C, add instant silicon, magnesium ingot and electrolytic copper, stir and melt to form aluminum alloy liquid;

[0047] The third step: using hexachloroethane to refine the aluminum alloy liquid, after removing slag, add Al-5Zr-1B alloy, Al-10Eu alloy and mixed heavy rare earth Re, and stir to make the compositio...

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Abstract

The invention discloses cast aluminum alloy with high strength and tenacity and a preparation method thereof. The cast aluminum alloy comprises, by mass percentage, 4.5-6.5% of Si, 1.5-2.5% of Mg, 1.5-2.5% of Cu, 0.01-0.02% of Zr, 0.002-0.004% of B, 0.01-0.03% of Eu, 0.1-0.3% of RE and the balance Al and unavoidable impurities. According to the preparation method, aluminum ingots, fast dissolving silicon, magnesium ingots, electrolytic copper, Al-5Zr-1B alloy, Al-10Eu alloy and mixed heavy rare earth RE serve as raw materials; the aluminum ingots are heated and melted, the fast dissolving silicon, the magnesium ingots and the electrolytic copper are added, and molten aluminum alloy is obtained after stirring and melting; after refining and deslagging are carried out on the molten aluminum alloy, the Al-5Zr-1B alloy, the Al-10Eu alloy and the mixed heavy rare earth RE are added; the molten aluminum alloy is cast into the aluminum alloy; and the aluminum alloy is subjected to solution treatment and aging treatment. The cast aluminum alloy has high strength, good plasticity and excellent casting fluidity, can be used for being cast into car stressed structural parts in various complex shapes, and has broad market application value.

Description

technical field [0001] The invention belongs to the field of aluminum alloy manufacturing, and in particular relates to a high-strength cast aluminum alloy and a preparation method thereof. Background technique [0002] Cast aluminum alloys are aluminum alloys that can be formed by casting processes, such as gravity casting, high pressure die casting, low pressure casting, squeeze casting, etc. Existing cast aluminum alloys mainly include four categories: Al-Si, Al-Cu, Al-Mg and Al-Zn. The Si content of Al-Si series cast aluminum alloys is usually 4 to 13%. Due to the high Si content, it has good casting fluidity, good wear resistance and machinability. It is the current casting aluminum alloy The aluminum alloy with the most varieties and the largest consumption is widely used in shells, cylinders, boxes, frames and other parts. However, Al-Si cast aluminum alloys have low strength and poor plasticity, which cannot meet the requirements of some automotive structural parts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03C22F1/043
CPCC22C1/026C22C1/03C22C21/02C22F1/002C22F1/043
Inventor 王顺成徐静赵禹凯郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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