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Method for preparing rare earth magnesium alloy semi-solid slurry by adopting zirconium refining and low-temperature pouring combined process

A semi-solid slurry and low-temperature casting technology, which is used in the preparation of metal semi-solid slurry and the preparation of rare-earth magnesium alloy semi-solid slurry by zirconium-refined composite low-temperature casting, which can solve the problem of rare earth-magnesium alloy semi-solid slurry, etc. problem, to achieve the effect of small size distribution, inhibition of oxidative combustion, and extension of mold life

Inactive Publication Date: 2014-08-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since Zr has a strong grain refinement effect, adding Zr refiner to rare earth magnesium alloy, through chemical refinement and low temperature casting method, is expected to directly obtain high-quality semi-solid slurry, but it has not been seen that Zr Patent for preparation of rare earth magnesium alloy semi-solid slurry by compounding thinning and low temperature casting

Method used

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  • Method for preparing rare earth magnesium alloy semi-solid slurry by adopting zirconium refining and low-temperature pouring combined process
  • Method for preparing rare earth magnesium alloy semi-solid slurry by adopting zirconium refining and low-temperature pouring combined process

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Experimental program
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Effect test

Embodiment 1

[0038] First, melt the magnesium. Magnesium is melted in a stainless steel crucible in a well-type resistance furnace, and the melting temperature is 670-680°C.

[0039] Then, alloying elements are added. After the magnesium is completely melted, alloying elements are added to the magnesium liquid. The temperature for adding the alloying elements is 730°C. The amount of Gd added is 8.0wt.% of the total mass of the smelted alloy. Gd is added in the form of Mg-Gd master alloy, wherein Gd Accounting for 90wt.%, the addition of Y is 6.0wt.% of the total mass of the smelted alloy, and Y is added in the form of Mg-Y master alloy, wherein Y accounts for 25wt.%.

[0040] Next, add the refiner. After adding alloying elements, raise the temperature to 750°C, and continue to add Zr to the mixed solution. The amount of Zr added is 0.5wt.% of the total mass of the smelted alloy. Zr is added in the form of Mg-Zr master alloy, of which Zr accounts for 30wt.%. , After adding Zr, let it sta...

Embodiment 2

[0044] First, melt the magnesium. Magnesium is melted in a stainless steel crucible in a well-type resistance furnace, and the melting temperature is 670-680°C.

[0045] Then, alloying elements are added. After the magnesium is completely melted, alloying elements are added at a temperature of 730°C. The amount of Y added is 5.0wt.% of the total mass of the smelted alloy. Y is added in the form of a Mg-Y master alloy, of which Y accounts for 25wt.%. Mixed rare earths are added The amount is 4.0wt.% of the total mass of the smelted alloy, and the mixed rare earth is added in the form of Mg-rare earth master alloy, of which the mixed rare earth accounts for 30wt.%.

[0046] Next, add the refiner. After adding the alloying elements, the temperature was raised to 750°C, and Zr was continued to be added to the mixed solution. The amount of Zr added was 0.8wt.% of the total mass of the smelted alloy. 2 ZrF 6 - Add in the form of NaCl-KCl mixed salt, after adding Zr, let it stand...

Embodiment 3

[0050] First, melt the magnesium. Melt magnesium in a stainless steel crucible in a well-type resistance furnace at a melting temperature of 670-680°C;

[0051] Then, alloying elements are added. After the magnesium is completely melted, alloying elements are added to the molten magnesium. The temperature for adding alloying elements is 730°C. The amount of Nd added is 3.0wt.% of the total mass of the smelted alloy. Nd is added in the form of Mg-Nd master alloy, where Nd Accounting for 90wt.%, the added amount of Zn is 0.2wt.% of the total mass of the smelted alloy, and Zn is added in the form of pure Zn.

[0052] Next, add the refiner. After adding alloying elements, the temperature was raised to 750°C, and Zr was added. The amount of Zr added was 1.0wt.% of the total mass of the smelted alloy, and Zr was expressed as ZrCl 4 - Add in the form of NaCl-KCl mixed salt, after adding Zr, let it stand for 20-30min to keep warm.

[0053] Finally, cold pouring. Control the cooli...

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Abstract

The invention discloses a method for preparing rare earth magnesium alloy semi-solid slurry by adopting a zirconium refining and low-temperature pouring combined process. The method comprises the following steps: melting magnesium, adding alloy elements, adding a refiner and performing low-temperature pouring. According to the method, the high-quality rare earth magnesium alloy semi-solid slurry is obtained by combining addition of the zirconium refiner with low-temperature pouring; the method has the advantages that melting and pouring processes are simple, stirring is not needed, and the obtained semi-solid slurry has an excellent tissue and is easy to mold.

Description

technical field [0001] The invention relates to a method for preparing metal semi-solid slurry, in particular to a method for preparing rare earth magnesium alloy semi-solid slurry by zirconium refining composite low-temperature casting, and belongs to the technical field of semi-solid forming of metal materials. Background technique [0002] Semi-solid processing technology is a new metal forming method proposed by Professor M.C.Flemings of the Massachusetts Institute of Technology in the 1970s. The properties it possesses are shaped. This new forming processing method combines the strengths of solidification processing and plastic processing, that is, the processing temperature is lower than that of the liquid state, and the deformation resistance is smaller than that of the solid state. Known as "the new generation of metal forming technology in the 21st century". The application of semi-solid forming technology in aluminum and magnesium alloys effectively reduces the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22C23/00B22D21/04
Inventor 张扬吴国华刘文才张亮汪存龙丁文江
Owner SHANGHAI JIAO TONG UNIV