Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent

A refiner and magnesium alloy technology, applied in the field of magnesium alloy casting, can solve the problems of difficulty in adding, poor wettability between SiC ceramic particles and Mg matrix, and achieve the effects of low production cost, good refining effect and simple operation process

Inactive Publication Date: 2012-04-11
DALIAN UNIV OF TECH
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Problems solved by technology

Solve the problem of poor wettability and difficult addition of SiC ceramic particles and Mg matrix

Method used

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  • Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent
  • Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent
  • Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent

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Embodiment Construction

[0009] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0010] (1) Preheat the crucible and alloy material. When the crucible is heated to 500°C, add about 600 grams of Mg. After the Mg is melted, add the corresponding content of Al-10Mn and Zn, and sprinkle RJ-2 covering agent on the surface.

[0011] (2) Raise the temperature of the melt to 780° C., press a block refiner composed of SiC and Mg (0.5% by mass fraction) into the magnesium alloy melt with a bell jar, and keep it warm for 20 minutes.

[0012] (3) Stir the magnesium alloy melt to completely disperse the massive refiner, and continue to keep warm for 10 minutes.

[0013] (4) Refining with argon for 2 minutes, then cooling to 680°C and applying an ultrasonic field with an ultrasonic power of 350 watts, pouring after 2 minutes of treatment.

[0014] from figure 1 with figure 2 It can be seen from the compar...

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Abstract

The invention provides a method for compositely refining AZ31 magnesium alloy crystal particles by an ultrasound field and a refining agent and belongs to the technical field of magnesium alloy casting. The method is characterized by comprising the following steps of: firstly, melting an AZ31 magnesium alloy under the protection of a magnesium alloy fusing agent; adding the refining agent consisting of SiC ceramic particles and magnesium powder when the temperature is raised to 780 DEG C, wherein the addition amount of the refining agent is 0.2%-1% by mass of magnesium alloy melt; after insulating for 20 minutes, stirring so that the refining agent is dispersed in the melt; after further insulating for 10 minutes, refining with argon; and applying the ultrasound field at the temperature of 680 DEG C-700 DEG C to process for 2 minutes and then pouring. The method has the beneficial effects of simple operation process, low production cost and good AZ31 magnesium alloy refining effect; and by using the method, the strength and toughness of the AZ31 magnesium alloy are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy casting, and relates to a method for compositely refining AZ31 magnesium alloy grains by an ultrasonic field and a refiner. Background technique [0002] AZ31 magnesium alloy is one of the most commonly used magnesium alloys, which has the advantages of high specific strength, specific stiffness, excellent casting performance and machining performance. However, the liquid-solid temperature interval of the AZ31 magnesium alloy is large, and defects such as shrinkage porosity, pores, and cracks are prone to occur during the solidification process. In addition, the coarse grains also lead to low mechanical properties of the alloy, which limits its wider application. [0003] Grain refinement technology can effectively improve the casting defects and improve the strength and toughness of the alloy. Magnesium alloy grain refinement methods can be divided into chemical methods and physical met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22C1/06C22F3/02
Inventor 郝海张爱民季首华张兴国
Owner DALIAN UNIV OF TECH
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