Grain refining method for AZ31 magnesium alloy

A technology of grain refinement and alloying, which is applied in the field of metal smelting, can solve the problems of no grain refiner and refinement process, and achieve the effects of low cost, simple operation and high production efficiency

Inactive Publication Date: 2011-05-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In summary, there is no efficient and environmentally friendly grain refiner and refinement process in the entire Mg-Al alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Smelting AZ31 alloy;

[0030] (2) The Fe content in the AZ31 melt obtained in the determination step (1) is 0.002%, and the Mn content is 0.003%;

[0031] (3) According to the detection result of step (2), the Al-20Mn master alloy is added in the melt obtained in step (1), so that the mass percentage of Mn is 0.1%;

[0032] (4) Keep warm at 720°C for 30 minutes to fully diffuse Fe and Mn in the melt;

[0033] (5) After the melt is refined, degassed and poured, an AZ31 alloy ingot with fine equiaxed grains can be obtained.

[0034] Grain size analysis indicated that the ingot grain size was 140 μm.

Embodiment 2

[0036] (1) Smelting AZ31 alloy;

[0037] (2) The Fe content in the AZ31 melt obtained in the determination step (1) is 0.008%, and the Mn content is 0.01%;

[0038] (3) According to the detection result of step (2), the Al-20Mn master alloy is added in the melt obtained in step (1), so that the mass percentage of Mn is 0.25%;

[0039] (4) Keep warm at 710°C for 25 minutes to fully diffuse Fe and Mn in the melt;

[0040] (5) After the melt is refined, degassed and poured, an AZ31 alloy ingot with fine equiaxed grains can be obtained.

[0041] Grain size analysis indicated that the ingot grain size was 210 μm.

Embodiment 3

[0043] (1) Smelting AZ31 alloy;

[0044] (2) The Fe content in the AZ31 melt obtained in the measurement step (1) is 0.01%, and the Mn content is 0.25%;

[0045] (3) According to the detection result of step (2), the Al-20Mn master alloy is added in the melt obtained in step (1), so that the mass percentage of Mn is 0.2%;

[0046] (4) Keep warm at 730°C for 20 minutes to fully diffuse Fe and Mn in the melt;

[0047] (5) After the melt is refined, degassed and poured, an AZ31 alloy ingot with fine equiaxed grains can be obtained.

[0048] Grain size analysis indicated that the ingot grain size was 160 μm.

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Abstract

The invention provides a grain refining method for AZ31 magnesium alloy. In the method, an effective nucleation core is separated out in the solidification process of melt by regulating the mass ratio of magnesium (Mg) to ferrum (Fe) in the melting process, so that tiny and equiaxial AZ31 ingots are obtained. By the method, the effective nucleation core is formed in the subsequent process of the melt only by regulating and controlling the mass ratio of the Mg to the Fe, without greatly changing the preparation melting process of the AZ31 alloy, so that the grain refining aim is fulfilled; and a grain refiner does not need to be added, so that the method is low in cost, high in production efficiency and simple in operation and has no pollution.

Description

technical field [0001] The invention relates to a grain refinement method of an AZ31 magnesium alloy, which belongs to the field of metal smelting. Background technique [0002] Magnesium alloy is the lightest metal structure material at present. It has low density, high specific strength, high specific stiffness, good vibration resistance, good electromagnetic shielding performance, excellent casting performance and machining performance. It is used in automobiles, transportation, Aviation and other fields have been more and more applications. However, due to the hexagonal close-packed lattice structure of magnesium, the plastic deformation ability of magnesium alloys is poor, which greatly limits the application range of magnesium alloys. As an effective means to improve the plastic deformation ability of magnesium alloys, grain refinement technology has always been a research hotspot in the field of application and development of magnesium alloys. [0003] AZ31 belongs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/06B22D27/20
Inventor 金青林王春建蒋业华岑启宏
Owner KUNMING UNIV OF SCI & TECH
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