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Layered/acicular two-phase composite enhanced rare earth magnesium alloy and preparation technology thereof

A composite reinforcement, rare earth magnesium technology, applied in the field of magnesium alloys, can solve the problems of low mechanical properties, uneven distribution, less research and development of alloys, etc., to achieve good results, improve hardness, and achieve the effect of alloy structure and performance.

Inactive Publication Date: 2015-09-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although there are many studies on alloys containing LPSO structures, there are still many shortcomings in this type of alloys. For example, the LPSO structure in these alloys is coarse and unevenly distributed, which leads to low mechanical properties.
In addition, the current rare earth magnesium alloys mainly contain rare earth elements such as Y and Gd, and there are few researches and developments on Mg-Zn-Er alloys.

Method used

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  • Layered/acicular two-phase composite enhanced rare earth magnesium alloy and preparation technology thereof
  • Layered/acicular two-phase composite enhanced rare earth magnesium alloy and preparation technology thereof
  • Layered/acicular two-phase composite enhanced rare earth magnesium alloy and preparation technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Now the Mg-Er master alloy, pure Zn and pure magnesium are removed from the scale layer, and the design alloy composition is Mg-6Er-4Zn (wt.%). First place the master alloy in a dry pot and melt it under a protective atmosphere. When the temperature rises to 760°C, stir, keep warm for 20 minutes, remove slag, and adjust the current. When the furnace temperature drops to 740°C, add pure magnesium and stir , keep warm for 10 minutes, remove slag, adjust the current, and when the furnace temperature drops to 700°C, add pure Zn, stir, keep warm for 10 minutes, remove slag, then raise the temperature to 760°C, keep warm, and stand still for 30 minutes. When the temperature of the alloy liquid drops to 720°C, pour it into an iron mold. The volume fraction of layered structure in the prepared alloy is about 10%, such as figure 1 As shown, its average hardness value is about 56HV.

[0028] The obtained layered structure alloy was subjected to solution treatment at 480°C, and th...

Embodiment 2

[0030] Now remove the scale layer of Mg-Er master alloy, pure Zn and pure magnesium, and design the alloy composition as Mg-14Er-7Zn. First place the master alloy in a dry pot and melt it under a protective atmosphere. When the temperature rises to 780°C, stir, keep warm for 20 minutes, remove slag, and adjust the current. When the furnace temperature drops to 740°C, add pure magnesium and stir , keep warm for 20 minutes, remove slag, and adjust the current flow. Finally, when the furnace temperature is lowered to 700°C, add pure Zn, stir, hold heat for 15 minutes, remove slag, and adjust the current flow. Raise the temperature of the furnace to 760°C, keep it warm and let it stand for 30 minutes. When the temperature of the alloy liquid drops to 740°C, pour it into an iron mold. The volume fraction of layered structure in the prepared alloy is about 25%, and its average hardness value is about 60HV.

[0031] The alloy was subjected to solid solution treatment at 450°C for 1...

Embodiment 3

[0033] Now remove the scale layer of Mg-Er master alloy, pure Zn and pure magnesium, and design the alloy composition as Mg-15Er-5Zn. First place the master alloy in a dry pot and melt it under a protective atmosphere. When the temperature rises to 780°C, stir, keep warm for 20 minutes, remove slag, and adjust the current. When the furnace temperature drops to 740°C, add pure magnesium and stir , keep warm for 10 minutes, remove slag, and finally, when the furnace temperature is lowered to 700°C, add pure Zn, stir, keep warm for 15 minutes, and remove slag. Raise the temperature of the furnace to 760°C, keep it warm and stand still for 30 minutes. When the temperature of the alloy liquid drops to 740°C, pour it into an iron mold. The volume fraction of the layered structure in the obtained alloy is about 35%, such as image 3 As shown, its average hardness value is about 75HV.

[0034] The obtained layered structure alloy was subjected to solution treatment at 500°C, and th...

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Abstract

The invention relates to a layered / acicular two-phase composite enhanced rare earth magnesium alloy and a preparation technology thereof, which belong to the technical field of magnesium alloy. The alloy comprises the following components by mass percentage: 6-25wt.% of Er, 4-10wt.% of Zn, and balance of Mg, wherein, mass proportion of Er / Zn is 1.5-3. The novel alloy is prepared by certain melting, a solid solution treatment technology is combined, and formation amount of the layered phase / acicular phase in the alloy can be controlled. Through the regulation and control technology, the hardness of the alloy is obviously changed.

Description

technical field [0001] The invention relates to a layered / acicular two-phase composite reinforced rare earth magnesium alloy and a preparation process thereof, belonging to the technical field of magnesium alloys. Background technique [0002] Magnesium alloy has the advantages of low density, high specific stiffness, high specific strength, large specific elastic modulus, good heat dissipation performance, strong load bearing capacity, and greater impact load capacity than aluminum alloy. It is the lightest energy-saving and environmentally friendly structure. Materials have extremely important industrial value and application prospects in the fields of automobiles, orbits, electronics, aerospace, aviation and national defense. However, magnesium alloys have obvious advantages, but also disadvantages: low absolute strength, poor plasticity, low elastic modulus; limited cold working and toughness; poor high temperature performance, lively chemical properties, and easy chemic...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C23/04C22C1/03
Inventor 刘轲李莉莉周丽媛刘强金可李桉泷
Owner BEIJING UNIV OF TECH
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