A kind of mg‑al‑zn‑si‑bi alloy and preparation method thereof

An alloy and silicon alloy technology, applied in the field of alloys, can solve the problems of limited refining effect and small improvement in mechanical properties, and achieve the effects of convenient operation, good high temperature stability and easy realization.

Inactive Publication Date: 2017-10-31
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of grain refinement can improve the mechanical properties of cast magnesium alloys, due to the limited refining effect, the improvement in mechanical properties is not large, and there is still a certain gap from the ideal mechanical properties.

Method used

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  • A kind of mg‑al‑zn‑si‑bi alloy and preparation method thereof
  • A kind of mg‑al‑zn‑si‑bi alloy and preparation method thereof
  • A kind of mg‑al‑zn‑si‑bi alloy and preparation method thereof

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Effect test

Embodiment 1

[0049] The present invention provides a kind of Mg-Al-Zn-Si-Bi alloy, by weight percentage, comprising:

[0050] 8.5% aluminum, 0.95% zinc, 2.0% silicon, 0.85% bismuth, the balance being Mg and unavoidable impurities.

[0051] The preparation method of a kind of Mg-Al-Zn-Si-Bi alloy described in the present invention is as follows:

[0052] a. According to the above percentages, weigh 2.39g of aluminum block, 8.0g of aluminum-silicon alloy (wherein the mass fraction of silicon element is 25%, and the mass fraction of aluminum element is 75%), 0.95g of zinc particles, 0.11g of aluminum foil, metal Bismuth 0.85g and magnesium block 87.7g;

[0053] b. Place the magnesium block, aluminum block, aluminum-silicon alloy, zinc particles (wrapped with aluminum foil) and metal bismuth in a box-type furnace, preheating at 180°C for 8 minutes;

[0054] c, put the preheated magnesium block into a stainless steel crucible with a temperature of 300°C, and then fill the crucible with protec...

Embodiment 2

[0059] The present invention provides a kind of Mg-Al-Zn-Si-Bi alloy, by weight percentage, comprising:

[0060] 7% aluminum, 1.1% zinc, 1.8% silicon, 1.4% bismuth, the balance being Mg and unavoidable impurities.

[0061] The preparation method of a kind of Mg-Al-Zn-Si-Bi alloy described in the present invention is as follows:

[0062] a. According to the above percentages, weigh 1.48g of aluminum block, 7.2g of aluminum-silicon alloy (wherein the mass fraction of silicon element is 25%, and the mass fraction of aluminum element is 75%), 1.1g of zinc particles, 0.12g of aluminum foil, metal Bismuth 1.4g and magnesium block 88.7g;

[0063] b. Place the magnesium block, aluminum block, aluminum-silicon alloy, zinc particles (wrapped with aluminum foil) and metal bismuth in a box furnace, and preheat at 150°C for 10 minutes;

[0064] c, put the preheated magnesium block into a stainless steel crucible with a temperature of 280°C, and then fill the crucible with protective gas ...

Embodiment 3

[0069] The present invention provides a kind of Mg-Al-Zn-Si-Bi alloy, by weight percentage, comprising:

[0070] 10% aluminum, 0.8% zinc, 2.2% silicon, 0.2% bismuth, the balance is Mg and unavoidable impurities.

[0071] The preparation method of a kind of Mg-Al-Zn-Si-Bi alloy described in the present invention is as follows:

[0072] a. According to the above percentages, weigh 3.29g of aluminum block, aluminum-silicon alloy (wherein the mass fraction of silicon element is 25%, and the mass fraction of aluminum element is 75%) 8.8g, zinc particles 0.8g, aluminum foil 0.11g, metal Bismuth 0.2g and magnesium block 86.8g;

[0073] b. Place the magnesium block, aluminum block, aluminum-silicon alloy, zinc particles (wrapped with aluminum foil) and metallic bismuth in a box-type furnace, preheating at 200°C for 5 minutes;

[0074] c, put the preheated magnesium block into a stainless steel crucible with a temperature of 320°C, and then fill the crucible with protective gas (the ...

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Abstract

The invention discloses an Mg-Al-Zn-Si-Bi alloy. The alloy is composed of the following ingredients in percentage by weight: 7-10% of aluminium, 0.8-1.1% of zinc, 1.8-2.2% of silicon, 0.2-1.4% of bismuth and the balance magnesium and inevitable impurities. A preparation method for the Mg-Al-Zn-Si-Bi alloy comprises the following steps: a. weighing magnesium blocks, aluminium blocks, aluminium-silicon alloy, zinc granules and metal bismuth; b. preheating; c. melting the magnesium blocks to form molten magnesium; d. adding the aluminium blocks and the aluminium-silicon alloy into the molten magnesium to obtain a melt; e. adding the zinc granules and the metal bismuth into the melt, stirring for 10-15 minutes, and then insulating heat for 15-20 minutes at 740-760 DEG C; and f. taking out a crucible charged with a protective gas, carrying out forced water-cooling on the crucible, and obtaining the alloy after cooling. The preparation method disclosed by the invention has the beneficial effects of being simple in process, convenient to operate, and easy to realize; and the prepared cast magnesium-aluminium alloy has high as-cast mechanical properties.

Description

technical field [0001] The invention specifically relates to the field of alloys, in particular to a Mg-Al-Zn-Si-Bi alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the metal structure material with the lowest density in engineering applications, and has the advantages of high specific strength, high specific modulus, high damping, excellent casting, cutting performance and easy recycling, and is widely used in automobiles, electronics, aerospace and other fields Among them, AZ91D magnesium alloy is currently the most successfully developed and widely used casting Mg-Al alloy, accounting for more than 90% of the total magnesium alloy. However, the solidification temperature range of AZ91D magnesium alloy is large, the grains are relatively coarse, and shrinkage is easy to occur, and the melting point of the Mg17Al12 phase distributed on the grain boundary is low, and it is easy to soften at high temperature, which reduces the mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03
CPCC22C1/03C22C23/02
Inventor 陈淑英常国威岳旭东李青春
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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