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Preparation method for refined magnesium alloy solidification tissue

A technology of solidified structure and magnesium alloy, which is applied in the field of preparation of high-performance complex thin-walled components, can solve the problems that the microstructure refinement effect of magnesium alloy is not obvious, complex thin-walled components are difficult to form, and the process is complicated. Improved performance, shortened time, and simple manufacturing process

Active Publication Date: 2012-07-04
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, the current various methods of refining the grain size do have a refining effect on specific magnesium alloys, but it is difficult to form complex thin-walled components
Although die casting, investment casting and lost foam casting can form complex thin-walled components, the effect on the microstructure refinement of magnesium alloy is not obvious, and the process is complicated and the cost is high.

Method used

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  • Preparation method for refined magnesium alloy solidification tissue
  • Preparation method for refined magnesium alloy solidification tissue
  • Preparation method for refined magnesium alloy solidification tissue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Add 9.1044% Al powder, 0.6479% Zn powder, 0.2236% Mn powder, 0.0276% Si powder, 0.0012% Cu powder, 0.0005% Ni powder, 0.0028% Fe powder to pure magnesium powder , 0.0008% Be powder, 0.0014% Pb powder mixed magnesium alloy raw material, wash with acetone, dry the magnesium alloy raw material cleaned with acetone completely and put it into the crucible resistance furnace, the maximum melting temperature of the crucible resistance furnace 1400°C, in tetrafluoroethane (CH 2 f 4 ) and CO 2 Melting is carried out under the protection of mixed gas, the melting temperature is 710°C, and the temperature is kept for 20 minutes;

[0022] b. Add carbon hexachloride (C 2 Cl 6 ) as a refining agent for refining, using mechanical stirring to mix evenly, and keep the temperature for 20 minutes when the melt temperature reaches 710°C;

[0023] c. The selected vertical centrifugal casting equipment has a maximum rotation speed of 2000rpm and a diameter of 600mm for the centrif...

Embodiment 2

[0026] a. Add the magnesium alloy raw material mixed with 3.2% Al powder, 0.78% Zn powder and 0.38% Mn powder in the pure magnesium powder, wash with acetone, and dry the magnesium alloy raw material cleaned with acetone Put it into the crucible resistance furnace, the maximum melting temperature of the crucible resistance furnace is 1400 ° C, in tetrafluoroethane (CH 2 f 4 ) and CO 2 Melting is carried out under the protection of mixed gas, the melting temperature is 730°C, and the temperature is kept for 20 minutes;

[0027] b. Add carbon hexachloride (C 2 Cl 6 ) as a refining agent for refining, using mechanical stirring to mix evenly, and keep the temperature for 20 minutes when the melt temperature reaches 730°C;

[0028] c. The selected vertical centrifugal casting equipment has a maximum rotation speed of 2000rpm and a diameter of 600mm for the centrifugal turntable. The metal casting mold is made of No. 45 steel. The maximum diameter of the casting that can be p...

Embodiment 3

[0031] a. Add a magnesium alloy raw material mixed with 9.9% Al powder, 0.5% Zn powder, and 0.5% Mn powder in the pure magnesium powder, wash with acetone, and dry the magnesium alloy raw material cleaned with acetone Put it into the crucible resistance furnace, the maximum melting temperature of the crucible resistance furnace is 1400 ° C, in tetrafluoroethane (CH 2 f 4 ) and CO 2 Melting is carried out under the protection of mixed gas, the melting temperature is 720°C, and the temperature is kept for 20 minutes;

[0032] b. Add carbon hexachloride (C 2 Cl 6 ) as a refining agent for refining, using mechanical stirring to mix evenly, and keep the temperature for 20 minutes when the melt temperature reaches 720°C;

[0033] c. The selected vertical centrifugal casting equipment has a maximum rotation speed of 2000rpm and a diameter of 600mm for the centrifugal turntable. The metal casting mold is made of No. 45 steel. The maximum diameter of the casting that can be prepar...

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Abstract

The invention relates to a preparation method for a refined magnesium alloy solidification tissue, which is suitable for preparing thin wall magnesium alloy structural components of high requirements and complicated performance in the industrial fields of automobiles, communication electronics, aerospace and the like. The preparation method comprises the following steps of: adding magnesium alloy raw materials cleaned by using acetone into a crucible resistance furnace; adding a refining agent for refining after smelting under the protection of mixed gas of tetrafluoroethane (CH2F4) and CO2 and maintaining the temperature for 20min; uniformly stirring and mixing; maintaining the temperature for 20min when the melt temperature reaches the smelting temperature again; pouring the smelted magnesium alloy melt into a high-speed rotating metal casting mold in a vertical centrifugal field; stopping the centrifugal rotation after the pouring is completed for 20min; and taking out when a magnesium alloy casting is cooled to the room temperature to prepare the magnesium alloy casting. The preparation method refines the solidification tissue of a magnesium alloy, enhances the performance of the casting and enlarges the application field of the magnesium alloy casting.

Description

technical field [0001] The invention relates to a method for refining the solidification structure of a magnesium alloy, and is especially suitable for the preparation of high-performance complex thin-walled components required in industrial fields such as automobiles, communication electronics, and aerospace. Background technique [0002] Magnesium alloys are known as "green engineering metals in the 21st century". It is being increasingly widely used in transportation, communication electronics, aerospace and some energy conservation fields. Therefore, the research and development of magnesium alloys is included in one of the projects that the country focuses on development. However, the current application of magnesium alloys is far less than that of aluminum alloys discovered in the same period. The main reason is that the current magnesium alloys: the absolute strength is still low, especially the high-temperature mechanical properties are poor; the chemical activity i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/02C22C1/06B22D21/04B22D13/00
Inventor 隋艳伟刘爱辉孙智王延庆
Owner CHINA UNIV OF MINING & TECH
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