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Method for preparing magnesium matrix composite semisolid slurry by adopting ultrasonic in situ synthesis

A semi-solid slurry and composite material technology, applied in the direction of improving process efficiency, etc., can solve the problems of low strength of magnesium alloy, limited application range, poor high temperature creep resistance, etc., to achieve fine solid particles and simple process , low cost effect

Inactive Publication Date: 2015-01-28
NANCHANG UNIV
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  • 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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  • Method for preparing magnesium matrix composite semisolid slurry by adopting ultrasonic in situ synthesis

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Embodiment 1

[0011] In this example, the 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) is used as the matrix, and the bulk Mg The -Y master alloy is broken into small particles, wrapped in aluminum foil and preheated to 250°C for use. After the matrix alloy is melted and kept warm, add Mg-Y intermediate alloy, then adjust the furnace temperature to 850°C, turn off the power supply of the melting furnace, put the ultrasonic horn probe into the melt, and ultrasonicate the melt. After the ultrasound stops, let it stand still, cool down to 584°C, and use continuous ultrasonic method to ultrasonically vibrate the melt to prepare particle-reinforced Al 2 Y / AZ91 Magnesium-based composite material semi-solid slurry. In order to prevent the oxidation of the alloy, a covering agent is used in the preparation process (the main component and mass fraction of the covering agent are: KCl is 45%, MgCl 2 ...

Embodiment 2

[0013] In this example, the AZ61 alloy (Al 6.0, Zn 0.538, Mn 0.218, Si 0.1, Fe 0.005, Cu 0.005, Ni 0.05, Others 0.3, the balance is Mg, mass fraction, the same below) is used as the matrix, and the bulk The Mg-Y master alloy is broken into small particles, wrapped in aluminum foil and preheated to 250°C for use. After the matrix alloy is melted and kept warm, add Mg-Y intermediate alloy, then adjust the furnace temperature to 850°C, turn off the power supply of the melting furnace, put the ultrasonic horn probe into the melt, and ultrasonicate the melt. set, lower the temperature to 570 ° C, and use continuous ultrasonic method to ultrasonically vibrate the melt to prepare particle-reinforced Al 2 Y / AZ61 magnesium composite semi-solid slurry. In order to prevent the oxidation of the alloy, a covering agent is used in the preparation process (the main component and mass fraction of the covering agent are: KCl is 45%, MgCl 2 45%, CaF 2 5%, BaCl 2 5%) and through SF 6 and CO...

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Abstract

The invention relates to a method for preparing magnesium matrix composite semisolid slurry by adopting ultrasonic in situ synthesis. The method for preparing the magnesium matrix composite semisolid slurry by adopting the ultrasonic in situ synthesis is characterized by comprising the following steps: firstly adding a Mg-Al-Zn alloy into a crucible of a smelting furnace, after the matrix alloy is molten, adding a Mg-Y intermediate alloy, regulating furnace temperature to be 850 DEG C, turning off a power supply of the smelting furnace, placing an ultrasonic amplitude transformer probe into a melt for ultrasonic treatment, standing after ultrasonic treatment is finished, and cooling to the temperature of 584-570 DEG C, and carrying out ultrasonic vibration on the melt by adopting a continuous ultrasonic method, so that Al2Y particle reinforced Mg-Al-Zn composite semisolid slurry is obtained, and a covering agent is adopted and a mixed gas of SF6 and CO2 is introduced for protection in a preparation process. The prepared magnesium matrix composite semisolid slurry is uniform in structure, solid particles are small, round and normal, the semisolid rheological forming requirement of a composite can be met, a technology is simple, operation is easy, cost is low, and energy conservation and environmental protection are realized.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite materials, and relates to a method for preparing semi-solid slurry. 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 m...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22B9/02C22C23/02
CPCY02P10/20
Inventor 闫洪黄文先
Owner NANCHANG UNIV
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