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Method for compositely refining solidification structure of magnesium alloy by combination of current and Zr

A technology of solidification structure and magnesium alloy, which is applied in the field of metal materials and metallurgy, to achieve the effects of reducing cold shock, improving quality, and novel ideas

Inactive Publication Date: 2012-09-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to solve the deficiency of using Zr alone to refine the solidification structure of magnesium alloy in the above-mentioned prior art, and to provide a method for combining electric current and Zr to refine the solidification structure of magnesium alloy, using physical refinement and chemical refinement Combining composite methods to achieve the effect of explosive nucleation and crystal nucleus proliferation, further refine the solidification structure of magnesium alloys, improve the mechanical properties of magnesium alloys, and broaden the application range of magnesium alloys

Method used

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  • Method for compositely refining solidification structure of magnesium alloy by combination of current and Zr
  • Method for compositely refining solidification structure of magnesium alloy by combination of current and Zr
  • Method for compositely refining solidification structure of magnesium alloy by combination of current and Zr

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Effect test

Embodiment 1

[0041] WE43 magnesium alloy (Mg-4wt.%Y-2wt.%Nd-1wt.%Gd-0.5wt.%Zr, wherein, wt.% refers to the percentage of components in the total mass of the prepared magnesium alloy) batch melting refining The process is as follows: paint all tools in advance, and dry the tools, charge, and refining agent at 180°C for more than 4 hours; turn on the resistance furnace, preheat the stainless steel melting crucible 5 to dark red, add magnesium ingots, and start to pass through the protection at 500°C The gas mixing device 1 and the blowing pipe 4 are fed with CO with a volume ratio of 100:1. 2 +5F 6 Protect the gas until the melting and casting work is completely completed; heat the melting crucible 5 to 690°C until the pure magnesium is completely melted, adjust the temperature to 720-740°C, and add Mg-25wt.%Y master alloy after the temperature is stable; wait until it is completely melted, melt When the body temperature is stable at 720-740°C, add mixed rare earth master alloy (Mg-25wt.%Nd...

Embodiment 2

[0045] ZM6 magnesium alloy (Mg-2.6wt.% Nd-0.6wt.% Zn-0.8wt.% Zr) batching melting and refining process is as follows: all tools are painted in advance, and tools, charge and refining agent are dried at 180 ° C for 4 hours above; turn on the resistance furnace, preheat the stainless steel melting crucible 5 to dark red, add magnesium ingots, and start feeding CO with a volume ratio of 100:1 at 500°C 2 +SF 6 Protect the gas until the melting and casting work is completed; heat the melting crucible 5 to 690°C until the pure magnesium is completely melted, adjust the temperature to 720-740°C, and add Zn after the temperature is stable; when the Zn is completely melted, the melt temperature is stable at 720-740 At ℃, add Mg-30wt.%Nd master alloy, stir 2 minutes by refining spoon after melting completely; Adjust the temperature to 790 ℃ and add the Zr-containing compound (mass ratio is K2ZrF6: NaCl: KCl =2:1:1), after it is completely melted, stir it for 7-10 minutes; let it stand ...

Embodiment 3

[0049] ZM2 magnesium alloy (Mg-4.2wt.%Zn-Nd1.5wt.%-0.6wt.%Zr) batching melting and refining process is as follows: all tools are painted in advance, and tools, charge and refining agent are dried at 180 ° C for 4 hours above; turn on the resistance furnace, preheat the stainless steel melting crucible 5 to dark red, add magnesium ingots, and start feeding CO with a volume ratio of 100:1 at 500°C 2 +SF 6 Protect the gas until the melting and casting work is completed; heat the melting crucible 5 to 690°C until the pure magnesium is completely melted, adjust the temperature to 720-740°C, and add Zn after the temperature is stable; when the Zn is completely melted, the melt temperature is stable at 720-740 At ℃, add cerium-rich mixed rare earth, stir for 2 minutes with a refining spoon after completely melting; adjust the temperature to 780℃, add Mg-30wt.%Zr master alloy with a mass of 0.8% of the total amount of the alloy, and stir at the bottom after it is completely melted 7 ...

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Abstract

The invention relates to a method for compositely refining a solidification structure of a magnesium alloy by combination of current and Zr. A Zr refiner is added in a smelting process of the magnesium alloy and current is introduced in a solidification process of the magnesium alloy till the magnesium alloy is solidified completely. The method provided by the invention comprises the specific steps of: (1) placing an electrode in a cast, and connecting the electrode with a power supply and pre-adjusting current parameters; (2) smelting the magnesium alloy by regular smelting, refining, drossing and peeling steps; (3) adding the Zr refiner till temperature of a mother solution of the magnesium alloy is adjusted to a predetermined temperature, and agitating and standing; and (4) pouring the mother solution of the magnesium alloy to the cast and turning on a power supply switch to introduce current from the beginning of pouring to complete solidication of the cast so as to obtain the refined solidification structure of the magnesium alloy. The method provided by the invention adopts a composite method which combines physical refining with chemical refining, is able to obtain the structure of the magnesium alloy with more smaller grains, more uniform structure and remarkably reduced deficiency, improves the mechanical property of the magnesium alloy, and is suitable for solidification and refining of the magnesium alloy.

Description

technical field [0001] The invention relates to a process method for refining the solidification structure of magnesium alloys, in particular to a method for combining electric current and Zr to refine the solidification structure of magnesium alloys, and belongs to the technical field of metal materials and metallurgy. Background technique [0002] Magnesium and magnesium alloys have significant advantages such as low density, high specific strength and specific stiffness, and low raw material prices, and have received more and more attention. Magnesium alloys have broad application prospects in the fields of automobiles, aerospace, military industry, and 3C products. my country is a big producer of magnesium resources and magnesium alloys. The output of magnesium and magnesium alloy ingots accounts for more than half of the world's total output. Further development of new strengthening technologies for magnesium alloys meets the strategic needs of national engineering rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02B22D27/20C22C1/02C22C23/00
Inventor 吴国华庞松刘文才魏广玲丁文江
Owner SHANGHAI JIAO TONG UNIV
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