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Method for thinning Mg-RE-Mn-Sc series magnesium alloy crystalline grains by adding Zr

A mg-re-mn-sc, magnesium alloy technology, applied in the field of metal materials and metallurgy, can solve problems that have not been seen and have no obvious grain refinement effect

Inactive Publication Date: 2012-06-27
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although Zr is recognized as having a good grain refinement effect on magnesium alloys, for magnesium alloys containing Mn, due to Emley et al. [1-Emley E.F. Principles of Magnesium Technology, Pergamon, Oxford, 1966, pp. 127 -155; 2- Bamberger M, Dehm G. Trends in the development of new Mg alloys [J]. Annual Review Mater. Res., 2008, 38: 505-533] think that Zr and Mn will form MnZr 2 Zr has no obvious grain refinement effect on Mn-containing magnesium alloys
It is precisely because of this that the research on Zr refinement of Mg-RE-Mn-Sc heat-resistant magnesium alloy grains at home and abroad has basically not been involved, and no relevant literature has been reported.

Method used

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  • Method for thinning Mg-RE-Mn-Sc series magnesium alloy crystalline grains by adding Zr
  • Method for thinning Mg-RE-Mn-Sc series magnesium alloy crystalline grains by adding Zr
  • Method for thinning Mg-RE-Mn-Sc series magnesium alloy crystalline grains by adding Zr

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Example 1: Under the protection of flux, the Mg-3Ce-1.2Mn-0.9Sc magnesium alloy is melted according to the composition ratio of 94.3wt.%Mg, 3wt.%Ce, 1.2wt.%Mn and 0.9wt.%Sc Raise the temperature to 740°C, add Mg-31wt.%Zr master alloy, and the amount of Zr added is 0.6wt.% of the total weight of the charge. Addition method: Bake the Mg-31wt.%Zr master alloy at 150°C for 20 minutes, then use a pressure ladle to quickly press it below the alloy liquid level for about 3 minutes, heat up to 740°C after stirring, and then use C 2 Cl 6 Refining agent refining treatment for 5 minutes. After refining, stir the alloy melt and let it stand at 740°C for 10 minutes. After standing, remove the surface scum, and then cast it into a metal mold that has been preheated to 100-150°C .

Embodiment 2

[0012] Example 2: Under the protection of flux, the Mg-4Y-1.2Mn-0.9Sc magnesium alloy is melted according to the composition ratio of 93wt.%Mg, 4wt.%Y, 1.2wt.%Mn and 0.9wt.%Sc Raise the temperature to 720°C, and add Mg-31wt.%Zr master alloy. The added amount of Zr is 0.9wt.% of the total weight of charge. Adding method: Bake the Mg-31%Zr master alloy at 150°C for 20 minutes, then use a pressure ladle to quickly press it below the alloy liquid level for about 3 minutes, heat up to 740°C after stirring, and then use C 2 Cl 6 Refining agent refining treatment for 5 minutes. After refining, stir the alloy melt and let it stand at 740°C for 10 minutes. After standing, remove the surface scum, and then cast it into a metal mold that has been preheated to 100-150°C .

Embodiment 3

[0013] Example 3: In CO 2 Under the protection of gas, the Mg-5Gd-1.2Mn-0.4Sc magnesium alloy was melted according to the composition ratio of 93.25wt.%Mg, 5wt.%Gd, 1.2wt.%Mn and 0.4wt.%Sc and then heated to 740°C. Add Mg-31%Zr master alloy. The added amount of Zr is 1.2wt.% of the total weight of charge. Addition method: Bake the Mg-31wt.%Zr master alloy at 150°C for 20 minutes, then use a pressure ladle to quickly press it below the alloy liquid level for about 3 minutes, heat up to 740°C after stirring, and then use C 2 Cl 6 Refining agent refining treatment for 5 minutes. After refining, stir the alloy melt and let it stand at 740°C for 10 minutes. After standing, remove the surface scum, and then cast it into a metal mold that has been preheated to 100-150°C .

[0014] Table 1 shows the composition and structure analysis and performance test results of the above three examples and the Mg-RE-Mn-Sc magnesium alloy without adding Zr. From the comparative analysis result...

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Abstract

The invention discloses a method for thinning Mg-RE-Mn-Sc series magnesium alloy crystalline grains by adding Zr, which is implemented by adding Mg-Zr intermediate alloy. The method comprises the following steps of: smelting Mg-RE-Mn-Sc magnesium alloy in a corresponding component ratio under the protection of flux or gas, then heating the smelted alloy to between 720 and 740 DEG C, and adding Mg-31wt.%Zr intermediate alloy into the smelted alloy, wherein the adding amount of the Zr accounts for 0.6 to 1.2 weight percent of the total weight of the furnace charge. The method can thin the thickcrystalline grains of Mg-RE-Mn-Sc series magnesium alloy and improve the tensile property of the Mg-RE-Mn-Sc series magnesium alloy so as to accelerate the industrialized application progress of the series magnesium alloy.

Description

technical field [0001] The invention relates to a method for adding Zr to refine Mg-RE-Mn-Sc series magnesium alloy grains and a melting and casting process, belonging to the field of metal materials and metallurgy. Background technique [0002] As the lightest commercial metal engineering structural material, magnesium alloy is known as the "21st century" because of its light specific gravity, high specific strength and specific stiffness, strong damping and vibration reduction, excellent liquid forming performance and easy recycling. Green Structural Materials". However, at present, due to the poor high-temperature creep resistance of existing magnesium alloys, the long-term working temperature cannot exceed 120°C, making it impossible to be used in the manufacture of automotive engines and other transmission parts that require high-temperature creep performance, thus greatly hindering the development of magnesium alloys. The further promotion and application of the alloy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03B22D27/20
Inventor 杨明波潘复生梁晓峰朱翊秦财源张微周涛
Owner CHONGQING UNIV OF TECH
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