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Preparation method for improving uniformity of zirconium-contained magnesium-based alloy cast ingot

A magnesium-based alloy, homogeneity technology, applied in the field of preparation of magnesium-based alloy elements segregation and structure uniformity, can solve the problems of inability to further reduce the size of zirconium, segregation of ingot elements, limited size control, etc., to achieve improved Reunion, low cost, good effect

Inactive Publication Date: 2018-03-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the precipitation of zirconium particles still occurs during the melt casting process, and this process is very rapid, so when this master alloy is added to the magnesium-based alloy melt, a large amount of zirconium agglomeration and segregation will still occur, resulting in ingot casting Element segregation and uneven organization appear
In addition, due to the high hardness of zirconium, this method has limited control over the size, which can only be controlled to about 5 μm, which cannot further reduce the size of zirconium. According to relevant research, there is still serious sedimentation of zirconium particles at this size

Method used

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  • Preparation method for improving uniformity of zirconium-contained magnesium-based alloy cast ingot

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Step 1: First determine the hardness, plasticity and toughness level and flammability of the raw material, namely the Mg-Zr alloy, so as to select accurate subsequent crushing process parameters. In this example, the Rockwell hardness of Mg-30wt% Zr is 45, the impact toughness is good, and the small alloy can be burned. In this way, a press is used for step-by-step crushing, the time is determined as 5s, the high-speed speed is 300mm / min, the low-speed speed is 200mm / min, and the pressure is gradually reduced from 20MPa to 10MPa.

[0013] Step 2: Pass the material obtained in step 1 through a 20-mesh sieve, put the 20-mesh material into a ball mill jar, add 2ml of alcohol to each jar, then replace it with argon three times, and vacuumize, the vacuum degree is 0.08 MPa, ball milled for 3 hours, the parameters are set as: rotation speed 350r / min, revolution speed 1.5min / r. Then, the ball-milled particles are passed through a 300-mesh screen using a vibrating screen, and ...

Embodiment 2

[0019] Step 1: First determine the hardness, plasticity and toughness level and flammability of the raw material, namely the Mg-Zr alloy, so as to select accurate subsequent crushing process parameters. In this example, the Rockwell hardness of Mg-30wt% Zr is 45, the impact toughness is good, and the small alloy can be burned. In this way, a press is used for step-by-step crushing, the time is determined as 5s, the high-speed speed is 300mm / min, the low-speed speed is 200mm / min, and the pressure is gradually reduced from 20MPa to 10MPa.

[0020] Step 2: Pass the material obtained in step 1 through a 20-mesh sieve, put the 20-mesh material into a ball mill jar, add 2ml of alcohol to each jar, then replace it with argon three times, and vacuumize, the vacuum degree is 0.08 MPa, ball milled for two hours, the parameters are set as: rotation speed 350r / min, revolution speed 1.5min / r. Then, the ball-milled particles are passed through a 300-mesh screen using a vibrating screen, an...

Embodiment 3

[0025] Step 1: First determine the hardness, plasticity and toughness level and flammability of the raw material, namely the Mg-Zr alloy, so as to select accurate subsequent crushing process parameters. In this example, the Rockwell hardness of Mg-30wt% Zr is 45, the impact toughness is good, and the small alloy can be burned. In this way, a press is used for step-by-step crushing, the time is determined as 5s, the high-speed speed is 300mm / min, the low-speed speed is 200mm / min, and the pressure is gradually reduced from 20MPa to 10MPa.

[0026] Step 2: Pass the material obtained in step 1 through a 20-mesh sieve, put the 20-mesh material into a ball mill jar, add 2ml of alcohol to each jar, then replace it with argon three times, and vacuumize, the vacuum degree is 0.08 MPa, ball milled for two hours, the parameters are set as: rotation speed 350r / min, revolution speed 1.5min / r. Then, the ball-milled particles are passed through a 200-mesh screen using a vibrating screen, an...

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Abstract

The invention discloses a preparation method for improving the segregation and structure uniformity of zirconium-containing magnesium-based alloy elements, and belongs to the technical field of magnesium-based alloy preparation. This method mainly uses the steps of press crushing, ball milling, vibrating screen, sand milling, composite ball milling, and cold pressing into a prefabricated body to homogenize the zirconium particles in the magnesium-zirconium master alloy for secondary redistribution and greatly reduce the particle size of the zirconium particles. The size is 1 μm or less, which is added to the magnesium alloy melt, and the zirconium-containing magnesium-based alloy is prepared by a stirring casting method. The preparation method provided by the invention greatly reduces the unmelted zirconium particles in the magnesium alloy ingot, greatly reduces the segregation degree of the Zr element, makes the grain structure more uniform, reduces the difference in mechanical properties between the zirconium-rich region and the zirconium-poor region, and can obtain High-quality zirconium-containing magnesium alloy ingots facilitate the control of the amount of zirconium used in industrial production and reduce the cost of use.

Description

technical field [0001] The invention relates to the technical field of magnesium-based alloy preparation, in particular to a preparation method for improving the segregation and microstructure uniformity of magnesium-based alloy elements containing high-density refractory element zirconium. Background technique [0002] Magnesium alloy has great application potential in aerospace, aviation, weapon industry, nuclear industry and other fields due to its advantages of low density, high specific strength, high ductility and excellent shock absorption ability. However, the low absolute strength of magnesium alloys greatly limits its wide application. At present, adding other alloying elements, such as silicon, silver, rare earth, zirconium, etc., to magnesium alloys is still an important method to increase the strength. Among these alloying elements, zirconium has the highest growth limiting factor, and a small amount of zirconium can rapidly reduce the grain size and greatly im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C23/00C22C23/02
CPCC22C1/03C22C23/00C22C23/02
Inventor 王李强关贺潘英才吴国清
Owner BEIHANG UNIV
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