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Method for preparing Mg2Si reinforced magnesium matrix composites

A composite material and magnesium alloy technology, which is applied in the field of magnesium-based composite material preparation, can solve the problems of coarse reinforcement phase particles, uneven distribution, and long reaction time, and achieve the effects of no three wastes pollution, simple process, and convenient operation

Inactive Publication Date: 2011-11-16
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Mg produced by the in-situ casting process 2 The particles of the Si reinforcement phase are coarse, unevenly distributed, and the reaction time is long, which hinders its further development

Method used

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  • Method for preparing Mg2Si reinforced magnesium matrix composites
  • Method for preparing Mg2Si reinforced magnesium matrix composites
  • Method for preparing Mg2Si reinforced magnesium matrix composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First, dry Si powder and wrap it with aluminum foil, put the AM60 magnesium alloy ingot into the crucible, heat it to melt, and keep it warm at 800°C. Extend the ultrasonic horn into the magnesium alloy melt, and at the same time, wrap the pretreated Si powder with a mass fraction of 1.0% with aluminum foil and add it to the melt. Under the condition of ultrasonic power of 400W, ultrasonic 30 Minutes; the temperature of the melt was lowered to 640°C, and ultrasonication was continued for 8 minutes during this process, and samples were casted.

Embodiment 2

[0012] Firstly, the Si powder is dried and covered with aluminum foil, the AM60 magnesium alloy ingot is put into a crucible and heated to melt, and kept at 850°C. Extend the ultrasonic horn into the magnesium alloy melt, and at the same time, wrap the pretreated Si powder with a mass fraction of 0.9% with aluminum foil and add it to the melt. Under the condition of ultrasonic power of 650W, ultrasonic 20 Minutes; the temperature of the melt was lowered to 645°C, and ultrasonication was continued for 5 minutes during this process, and samples were casted.

Embodiment 3

[0014] Firstly, the Si powder is dried and covered with aluminum foil, the AM60 magnesium alloy ingot is put into a crucible and heated to melt, and kept at 900°C. Extend the ultrasonic horn into the magnesium alloy melt, and at the same time, wrap the pretreated Si powder with a mass fraction of 1.1% with aluminum foil and add it to the melt. Under the condition of ultrasonic power of 900W, ultrasonic 10 Minutes; the temperature of the melt was lowered to 650°C, and ultrasonication was continued for 2 minutes during this process, and samples were casted.

[0015] like figure 1 Shown, the Mg obtained under the conditions of implementing example 2 2 There are no obvious dendrites in the structure of Si / AM60 magnesium matrix composites, but a large number of rose-shaped and spherical grains instead. The local supercooling phenomenon caused by the growth of ultrasonic cavitation bubbles makes some crystal grains appear prematurely in the melt, and these fine particles are broke...

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Abstract

The invention relates to a method for preparing Mg2Si reinforced magnesium matrix composites, which belongs to the field of the metal material preparation. The method comprises the following steps: firstly carrying out drying treatment on Si powders and using an aluminum foil to coat the Si powders, putting an AM 60 magnesium alloy ingot into a crucible to heat to melt down the ingot, and carrying out heat insulation at a temperature between 800 and 900 DEG C; extending an ultrasonic amplitude transformer into the magnesium alloy melt, and simultaneously using the aluminum foil to coat the preprocessed Si powders the mass fraction of which is between 0.9 and 1.1 percent and adding the coated Si powders into the melt, and carrying out ultrasonic processing for 10 to 30 minutes under the condition that the ultrasonic power is between 400 and 900 W; and reducing the temperature of the melt to 640 to 650 DEG C, continuously carrying out ultrasonic processing for 2 to 8 minutes in the process of reducing the temperature, and carrying out moulding and sampling. The crystal grains in the tissues of the Mg2Si / AM60 magnesium matrix composites are fine. The Mg2Si reinforced grains have small size and uniform distribution, has simple, safe and reliable process and convenient operation, and has no pollution of the three wastes.

Description

technical field [0001] The invention belongs to the field of metal material preparation, in particular to a preparation method of a magnesium-based composite material. Background technique [0002] Particle-reinforced magnesium-based composites have many advantages such as specific strength, high specific stiffness, wear resistance, and high vibration damping. Mg 2 Si is an ideal reinforcing phase because of its good thermoelectric properties, high melting point, high hardness, high elastic modulus and low price, and has attracted the attention of many scholars. Mg and Si in the particle-reinforced magnesium-based composite prepared by the in-situ reaction method will undergo a chemical reaction spontaneously, and the equation is: 2Mg(g)+Si(s)→2Mg 2 Si(s). Composite materials produced by in-situ reaction have the characteristics of good interfacial bonding, no pollution, good thermal stability, and cost saving, so they have gradually attracted attention. However, the Mg ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C23/00
Inventor 闫洪陈小会吴庆捷胡志
Owner NANCHANG UNIV