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Method for refining magnesium alloy grains by using Zn-Sr intermediate alloy

A technology for master alloys and magnesium alloys, which is applied in the fields of metal materials and metallurgy, and can solve the problems of poor grain efficiency of magnesium alloys.

Inactive Publication Date: 2012-04-11
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the deficiency that the efficiency of refining magnesium alloy grains of existing Al-Sr and Mg-Sr master alloys is relatively poor, and proposes a method for refining magnesium alloy grains using other Sr master alloys, including its finer alloys. In order to achieve the purpose of developing Sr master alloys for grain refinement of magnesium alloys with higher refinement efficiency, and further promote the application of Sr as a microalloying element for grain refinement in magnesium alloys

Method used

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  • Method for refining magnesium alloy grains by using Zn-Sr intermediate alloy
  • Method for refining magnesium alloy grains by using Zn-Sr intermediate alloy
  • Method for refining magnesium alloy grains by using Zn-Sr intermediate alloy

Examples

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Effect test

Embodiment 1

[0025] Example 1: Under the melting conditions of flux or gas protection, AZ31(Mg-3Al-1Zn) magnesium alloy is melted in a crucible and then heated to 740°C, and Zn-58wt%Sr master alloy is added, and the amount of Sr added is 0.1% (weight percentage). After adding the Zn-58wt%Sr master alloy, keep the alloy melt at 740°C for 5-10 minutes, then stir the alloy melt, heat up to 720°C after stirring, and then use C 2 Cl 6 The refining agent is used for refining treatment for 5-10 minutes. After refining, stir the alloy melt and let it stand at 740°C for 10 minutes. After standing, remove the scum on the surface of the alloy melt to obtain a magnesium alloy melt with good refining effect.

Embodiment 2

[0026] Example 2: Under flux or gas shielded smelting conditions, AZ91 (Mg-9Al-1Zn) magnesium alloy is melted in a crucible and then heated to 740°C, and Zn-65wt%Sr master alloy is added, and the amount of Sr added is 0.05% (weight percent). After adding the Zn-65wt%Sr master alloy, keep the alloy melt at 740°C for 5-10 minutes, then stir the alloy melt, heat up to 730°C after stirring, and then use C 2 Cl 6The refining agent is used for refining treatment for 5-10 minutes. After refining, stir the alloy melt and let it stand at 740°C for 10 minutes. After standing, remove the scum on the surface of the alloy melt to obtain a magnesium alloy melt with good refining effect.

Embodiment 3

[0027] Example 3: Under flux or gas shielded smelting conditions, the ZA84 (Mg-8Zn-4Al) magnesium alloy is melted in a crucible and then heated to 740°C, and the Zn-72wt%Sr master alloy is added, and the amount of Sr added is 0.15% (percentage by weight). After adding the Zn-72wt%Sr master alloy, keep the alloy melt at 740°C for 5-10 minutes, then stir the alloy melt, heat up to 740°C after stirring, and then use C 2 Cl 6 The refining agent is used for refining treatment for 5-10 minutes. After refining, stir the alloy melt and let it stand at 740°C for 10 minutes. After standing, remove the scum on the surface of the alloy melt to obtain a magnesium alloy melt with good refining effect.

[0028] The grain size test results of the magnesium alloys with Zn-Sr master alloy and no Zn-Sr master alloy used in the three embodiments are shown in Table 1, and the fiber structure pictures are shown in Figure 1A-1E , Figure 2A-Figure 2E , Figure 3A-Figure 2E . From the comparati...

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Abstract

The invention provides a method for refining magnesium alloy grains by using a Zn-Sr intermediate alloy. The method comprises the following steps of: adding an intermediate alloy containing Zn and 58 to 72 weight percent of Sr into a magnesium alloy, refining the grains of the magnesium alloy, and thus obtaining the grains with the refining efficiency which is higher than that of Al-Sr and Mg-Sr intermediate alloys.

Description

technical field [0001] The invention relates to a method and a process for refining magnesium alloy grains with a Zn-Sr master alloy, and belongs to the field of metal materials and metallurgy. Background technique [0002] Magnesium alloys are known as "green structural materials in the 21st century" due to their rich resources, light specific gravity, high specific strength and specific stiffness, strong damping, vibration reduction and dryness reduction, electromagnetic radiation shielding and easy recycling. At present, although magnesium alloys are gradually being applied in the fields of automobiles and aerospace, with the deepening of applications, higher and higher requirements are put forward for the performance of magnesium alloys. Since the 1990s, although extensive research has been carried out on the development and application of magnesium alloys at home and abroad, some technical bottlenecks that hinder the large-scale application of magnesium alloys have not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C23/00
Inventor 杨明波潘复生李洪亮郭廷长王春欢李晖胡红军周涛
Owner CHONGQING UNIV OF TECH
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