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In-situ preparation method of Al2Y particle reinforced magnesium matrix composite

A technology of particle reinforcement and composite materials, applied in the field of metal matrix composite materials, can solve the problems of low strength, limited application range, poor creep resistance at high temperature and other problems of magnesium alloys

Inactive Publication Date: 2013-04-17
江西迈肯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of magnesium alloys such as low strength and poor high temperature creep resistance, its application range is limited.

Method used

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  • In-situ preparation method of Al2Y particle reinforced magnesium matrix composite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The test uses AZ91 alloy (Al 9.163, Zn 0.538, Mn 0.218, Si 0.042, Fe 0.0028, Cu 0.0053, Be 0.0007, Ni 0.0056, the balance is Mg, mass fraction, the same below) as the matrix, and yttrium, yttrium, Add in the form of Mg-Y master alloy. Before adding, break the large master alloy into small particles, wrap it in aluminum foil and preheat it to 300°C for use. In order to prevent alloy oxidation, self-made covering agent and SF 6 and CO 2 Mixed gas for protection. The melting temperature is first set to 700°C, and after the matrix alloy is melted, it is kept for 10 minutes. The amount of -Y master alloy added is 5% (mass fraction) of the mass of the melt. Turn off the power of the melting furnace, mechanically stir the melt, let it stand after the stirring stops, remove the slag, quickly cool down to 740°C, and pour. Obtaining in-situ particle-reinforced Al 2 Y / AZ91 magnesium matrix composite material.

Embodiment 2

[0012] The test uses AZ61 alloy (Al 6.0, Zn 0.538, Mn 0.218, Si 0.1, Fe 0.005, Cu 0.005, Ni 0.05, Others0.3, the balance is Mg, mass fraction, the same below) as the matrix, adding yttrium to the alloy, Yttrium is added in the form of Mg-Y master alloy. Before adding, the bulk master alloy is broken into small particles, wrapped in aluminum foil and preheated to 300°C for use. In order to prevent alloy oxidation, self-made covering agent and SF 6 and CO 2 Mixed gas for protection. The melting temperature is first set to 700°C, and after the matrix alloy is melted, it is kept for 10 minutes. The amount of -Y master alloy added is 3% (mass fraction) of the mass of the melt. Turn off the power of the melting furnace and mechanically stir the melt. After the stirring stops, let it stand still, remove the slag, quickly cool down to 740°C, and pour. Obtaining in-situ particle-reinforced Al 2 Y / AZ61 magnesium matrix composite material.

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Abstract

The invention discloses an in-situ preparation method of an Al2Y particle reinforced magnesium matrix composite. The in-situ preparation method is characterized in that the method comprises the steps that an Mg-Al-Mn-Zn alloy is added to a crucible in a smelting furnace with smelting temperature of 700 DEG C; heat preservation is conducted for 10min after the alloy is molten; furnace temperature is adjusted to 800-850 DEG C; a self-prepared covering agent is adopted and SF6 and CO2 mixed gas is supplied for protection in a smelting process; an Mg-Y intermediate alloy containing 30% of Y by mass fraction is added to a melt; the addition amount of the Mg-Y intermediate alloy is 3-5% of the mass of the melt; a power supply of the smelting furnace is turned off; and the melt is subjected to mechanical stirring, standing, deslagging, rapid cooling to 740 DEG C, and then casting. Particles of Al2Y in the composite prepared by the preparation method are small and distributed uniformly, and the property of the composite is improved compared with a matrix material.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite materials. Background technique [0002] With the enhancement of people's awareness of energy saving and environmental protection, magnesium alloy, as one of the lightest metal structural materials, is becoming more and more popular. However, due to the shortcomings of magnesium alloys such as low strength and poor high temperature creep resistance, their application range is limited. In order to improve the comprehensive performance of magnesium alloys and expand the application fields and scope of magnesium alloys, it is an important development direction to introduce reinforcement relative to magnesium alloys for composite strengthening. The in-situ reaction synthesis method is used to prepare metal matrix composites, and one or several relatively uniformly dispersed reinforcing phases with high hardness and high elastic modulus are formed in situ in the metal matrix, which can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/03C22C23/00
Inventor 闫洪黄文先艾凡荣罗忠民
Owner 江西迈肯科技有限公司