Rare earth element erbium-modified cast hypoeutectic Al-Mg2Si alloy and preparation method thereof

A rare earth element and hypoeutectic technology, which is applied in the field of aluminum alloys, can solve problems such as hypoeutectic Al-Mg2Si alloys that have not yet been seen, and achieve the effects of low price, abundant resources, and improved plasticity

Inactive Publication Date: 2020-05-08
NANCHANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, there has been no report on casting hypoeutectic Al-Mg modified by rare earth element Er. 2 Any report on Si alloy

Method used

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  • Rare earth element erbium-modified cast hypoeutectic Al-Mg2Si alloy and preparation method thereof
  • Rare earth element erbium-modified cast hypoeutectic Al-Mg2Si alloy and preparation method thereof
  • Rare earth element erbium-modified cast hypoeutectic Al-Mg2Si alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Al-8Mg 2 Add 0.20% Er to the Si alloy. According to the mass percentages of 91.80%Al, 5.06%Mg, 2.94%Si and 0.20%Er, weigh 1167.04g of aluminum ingot with a purity of 99.96%, 215.06g of Al-40Mg master alloy block, 249.90g of Al-Si master alloy block and 68.00g of Al -Er intermediate alloy block, as a raw material for making alloy ingots, the total mass of ingredients is 1700g. After the various prepared raw materials have been cleaned and dried, first put 1167.04g of aluminum ingots and 249.90g of Al-Si intermediate alloy blocks into a graphite crucible resistance furnace, heat them, and cool down to 700°C after they are completely melted at 720°C. Add the g Al-Mg intermediate alloy block into the melt until it melts, and let it stand for 5 minutes. Press 0.2% hexachloroethane into the melt with a graphite bell jar preheated at 300°C, stir at 740°C to remove scum on the surface of the melt. 68.00 g of Al-Er master alloy ingots were added to the melt at 780°C. After m...

Embodiment 2

[0035] Al-8Mg 2 Add 0.10% Er to the Si alloy. According to the mass percentage of 91.90%Al, 5.06%Mg, 2.94%Si and 0.10%Er, weigh 1201.04g of aluminum ingot with a purity of 99.96%, 215.06g of Al-40Mg master alloy block, 249.90g of Al-Si master alloy block and 34.00g of Al -Er intermediate alloy block, as a raw material for making alloy ingots, the total mass of ingredients is 1700g. After the various prepared raw materials have been cleaned and dried, first put 1201.04g of aluminum ingots and 249.90g of Al-Si intermediate alloy blocks into a graphite crucible resistance furnace, heat them, and cool down to 700°C after they are completely melted at 720°C. Add the g Al-Mg intermediate alloy block into the melt until it melts, and let it stand for 5 minutes. Press 0.2% hexachloroethane into the melt with a graphite bell jar preheated at 300°C, stir at 740°C to remove scum on the surface of the melt. 34.00 g of Al-Er master alloy ingots were added to the melt at 740°C. After me...

Embodiment 3

[0038] Al-8Mg 2 Add 0.30% Er to the Si alloy. According to the mass percentage of 91.70%Al, 5.06%Mg, 2.94%Si and 0.30%Er, weigh 1133.04g of aluminum ingot with a purity of 99.96%, 215.06g of Al-40Mg master alloy block, 249.90g of Al-Si master alloy block and 102.00g of Al -Er intermediate alloy block, as a raw material for making alloy ingots, the total mass of ingredients is 1700g. After the various prepared raw materials have been cleaned and dried, first put 1133.04g of aluminum ingots and 249.90g of Al-Si intermediate alloy blocks into a graphite crucible resistance furnace, heat them, and cool down to 700°C after they are completely melted at 720°C. Add the g Al-Mg intermediate alloy block into the melt until it melts, and let it stand for 5 minutes. Press 0.2% hexachloroethane into the melt with a graphite bell jar preheated at 300°C, stir at 740°C to remove scum on the surface of the melt. 102.00 g of Al-Er master alloy ingots were added to the melt at 720°C. After ...

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Abstract

The invention provides a rare earth element erbium-modified cast hypoeutectic Al-Mg2Si alloy. The alloy comprises, by mass percentage, 2.53%-7.26% of Mg, 1.47%-4.24% of Si, 0.10%-0.30% of Er and the balance Al, wherein Mg and Si form 4.0%-11.5% of a Mg2Si phase under an as-cast condition. According to the alloy, through the modification function of the rear earth element Er, eutectic Mg2Si is converted from a thick and big Chinese character shape into a fine fiber shape, thick and large dendrite of primary alpha-Al becomes slight, mechanical properties, especially the plasticity, is greatly improved, and the tensile strength and elongation rate of the alloy are increased by 27.50% and 82.41% respectively. The strengthening mechanism of Er is fine grain strengthening and dispersion strengthening. Er has the functions of deterioration and refining at the same time, so that a smelting process is simplified, and mutual poisoning between different elements serving as modifiers and refiningagents is avoided.

Description

technical field [0001] The invention relates to a rare earth element erbium modified casting hypoeutectic Al-Mg 2 A Si alloy and a preparation method thereof belong to the technical field of aluminum alloys. Background technique [0002] In traditional Al-Si-Mg alloys, Mg 2 As the second phase, Si is dispersed and precipitated through solid solution-aging heat treatment to strengthen the Al matrix. In recent years, direct precipitation of Mg from molten aluminum 2 Al-Mg formed from Si phase 2 Si alloys have been widely concerned by scholars at home and abroad. Compared with the traditional Al-Si-Mg alloy, this type of alloy contains Mg and Mg 2 The volume fraction of Si phase is higher, and it has higher specific stiffness, specific strength and wear resistance. It has wider application prospects as a new lightweight material in the fields of aerospace, aviation and automobiles. However, the Mg precipitated in the as-cast state of this type of alloy 2 Si is relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22C1/03
CPCC22C1/026C22C1/03C22C21/08
Inventor 武晓峰曾敏张莉程婷陆志鹏
Owner NANCHANG INST OF SCI & TECH
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