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High-hardness heat-resistant magnesium alloy

A magnesium alloy and high hardness technology, applied in the field of magnesium alloy materials, can solve the problems of increased alloy cost and increased difficulty in preparation, and achieve the effects of low production cost, reduced cost and improved heat resistance

Inactive Publication Date: 2013-06-19
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, Xiao Yang, Zhang Xinmin and others have studied the mechanical properties of heat-resistant magnesium alloys Mg-9Gd-4Y-0.6Zr and Mg-8Gd-4Y-Nd-Zr. The hardness of the two alloys reaches 145Hv and 130Hv respectively; however, due to Rare earth elements gadolinium, yttrium, and neodymium are used, which increases the cost of the alloy and increases the difficulty of preparation

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] High-hardness heat-resistant magnesium alloy, each component and mass percentage are Al: 5%, Sn: 2%, Ca: 1%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the balance is Mg.

[0037] The preparation method is as follows:

[0038] (1) Ingredients: The raw materials are 99.9% pure metal Mg, 99.9% metal Al, 99.9% metal Sn, and Mg-20% Ca master alloy. The mass percentage of each element is Al: 5%, Sn: 2 %, Ca: 1%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the balance is Mg;

[0039] (2) Melting: Use iron crucible to melt in well-type resistance furnace, using N2 and SF 6 The mixed gas is used as a protective gas. First, metal Mg is smelted. After it is completely melted, Mg-20% Ca master alloy, pure Al and Sn metal are added in turn, and the melting temperature is controlled at 700°C to obtain liquid metal;

[0040] (3) Casting: The molten metal is poured at 670°C. Under the normal casting process, the model adopts a metal mold.

[0041] (4) Heat tre...

Embodiment 2

[0044] High-hardness heat-resistant magnesium alloy, each component and mass percentage are Al: 5%, Sn: 2%, Ca: 1%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the balance is Mg.

[0045] The preparation method is as follows:

[0046] (1) Ingredients: The raw materials are 99.9% pure metal Mg, 99.9% metal Al, 99.9% metal Sn, and Mg-20% Ca master alloy. The mass percentage of each element is Al: 5%, Sn: 2 %, Ca: 1%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the balance is Mg;

[0047] (2) Melting: Use iron crucible to melt in well-type resistance furnace, using N 2 and SF 6 The mixed gas is used as a protective gas. First, metal Mg is smelted. After it is completely melted, Mg-20% Ca master alloy, pure Al and Sn metal are sequentially added, and the melting temperature is controlled at 710°C to obtain liquid metal;

[0048] (3) Casting: The molten metal is poured at 680°C. Under the normal casting process, the model adopts a metal mold.

[0049] (4) H...

Embodiment 3

[0052] High-hardness heat-resistant magnesium alloy, each component and mass percentage are Al: 5%, Sn: 2%, Ca: 1%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the balance is Mg.

[0053] The preparation method is as follows:

[0054] (1) Ingredients: The raw materials are 99.9% pure metal Mg, 99.9% metal Al, 99.9% metal Sn, and Mg-20% Ca master alloy. The mass percentage of each element is Al: 5%, Sn: 2 %, Ca: 1%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the balance is Mg;

[0055] (2) Melting: Use iron crucible to melt in well-type resistance furnace, using N 2 and SF 6 The mixed gas is used as a protective gas. First, metal Mg is smelted. After it is completely melted, Mg-20% Ca master alloy, pure Al and Sn metal are added in turn, and the melting temperature is controlled at 720°C to obtain liquid metal;

[0056] (3) Casting: The molten metal is poured at 690°C, and the model adopts a metal mold under the normal casting process.

[0057] (4) Hea...

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Abstract

The invention discloses a high-hardness heat-resistant magnesium alloy. The alloy is characterized by comprising the following components in percent by mass: 5% of Al, 2% of Sn, 1-5% of Ca, not greater than 0.005% of impurity Fe, not greater than 0.015% of impurity Cu, not greater than 0.002% of impurity Ni, and the balance of Mg. According to the alloy disclosed by the invention, the high-temperature strengthening phases of Mg2Sn, Mg2Ca, Al2Ca and CaMgSn are generated by adding Al element, Sn element and Ca element together, so that the alloy has the characteristics of being high in hardness, good in heat resistance, and the like. Compared with the existing heat-resistant magnesium alloy, the alloy disclosed by the invention is good in room-temperature performance and high-temperature performance, low in production cost, high in efficiency, and capable of being widely applied to commercial components comprising automobile parts, electronic product components and aerospace components.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy materials, and in particular relates to a high-hardness heat-resistant magnesium alloy. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application, with a small specific gravity (1.75~1.85×10 3 kg / m 3 , about 64% of aluminum, 23% of steel), high specific strength and specific stiffness, good damping and machinability, large impact energy absorption, and easy recycling, etc., are considered to be an effective way to reduce weight, An ideal material for saving energy and contributing to sustainable development. Widely used in automotive, aerospace, electronics and other fields. However, due to the low strength and poor heat resistance of magnesium alloys, its application range is limited. Therefore, improving the strength and heat resistance of magnesium alloys and making them have good comprehensive properties is a hot spo...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C23/00
Inventor 邱克强尤俊华任英磊李庆丰热焱
Owner SHENYANG POLYTECHNIC UNIV
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