Casting magnesium alloy and preparation method thereof

A technology for casting magnesium alloys and alloy liquids, which is applied in the field of magnesium alloys, can solve problems such as poor plastic forming ability, and achieve good plasticity, cost reduction, and good solid solution strengthening

Active Publication Date: 2017-11-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the crystal structure of magnesium alloy is hexagonal close-packed, the slip system at room temperature is relatively small, and the plastic forming ability is poor, which has become one of the main technical bottlenecks for the industrial application of magnesium alloy.

Method used

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  • Casting magnesium alloy and preparation method thereof
  • Casting magnesium alloy and preparation method thereof

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preparation example Construction

[0060] The present invention provides a method for preparing a cast magnesium alloy described in the above technical solution, comprising:

[0061] Mixing and melting magnesium source, zinc source, zirconium source and rare earth source to obtain alloy liquid;

[0062] The alloy liquid is cast to obtain a cast magnesium alloy.

[0063] Before mixing the magnesium source, zinc source, zirconium source and rare earth source, it is preferable to preheat to 200-250°C after removing the scale on the surface.

[0064] In the present invention, the mixing method is preferably:

[0065]The magnesium source is firstly added and after the magnesium source is melted, the zinc source and the rare earth source are sequentially added, and finally the zirconium source is added to obtain molten metal.

[0066] In the present invention, the crucible is preferably preheated to 500-600°C and the temperature is raised to 730-740°C after adding the magnesium source; more preferably, the crucible...

Embodiment 1

[0090] The magnesium source, the zinc source, the zirconium source and the ytterbium source are proportioned according to the mass ratio of each component, and the oxide skin on the surface of each raw material is removed, and each raw material is preheated to 200°C.

[0091] Preheat the crucible to 550°C, add magnesium source, raise the furnace temperature to 730°C, and feed SF with a volume ratio of 1:200 6 and CO 2 mixed gas as a shielding gas.

[0092] After the magnesium source is completely melted, add the above-mentioned zinc source and ytterbium source preheated to 200°C, and stir evenly.

[0093] After the above-mentioned stirring is completed, the temperature of the furnace is raised to 780° C. and the above-mentioned zirconium source preheated to 200° C. is added, and stirred evenly to obtain molten metal.

[0094] The molten metal is cooled to 740°C, and argon gas is introduced into it for 30 seconds to remove hydrogen.

[0095] Add No. 6 flux to the metal liqui...

Embodiment 2

[0100] The magnesium source, the zinc source, the zirconium source and the ytterbium source are proportioned according to the mass ratio of each component, and the oxide skin on the surface of each raw material is removed, and each raw material is preheated to 300°C.

[0101] Preheat the crucible to 550°C, add magnesium source, raise the furnace temperature to 740°C, and feed SF with a volume ratio of 1:200 6 and CO 2 mixed gas as a shielding gas.

[0102] After the magnesium source is completely melted, add the above-mentioned zinc source and ytterbium source preheated to 300°C, and stir evenly.

[0103] After the above-mentioned stirring is completed, the temperature of the furnace is raised to 780° C. and the above-mentioned zirconium source preheated to 300° C. is added, and stirred evenly to obtain molten metal.

[0104] The molten metal is cooled to 750°C, and argon gas is introduced into it for 30 seconds to remove hydrogen.

[0105] Add No. 6 flux to the molten meta...

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Abstract

The invention provides a casting magnesium alloy comprising the components: 0.8-2wt% of Zn, 0.2-0.6wt% of Zr, 0.05-0.55wt% of RE and the balance of Mg and unavoidable impurities, wherein RE is Yb or Y. An Mg-Zn-Zr casting magnesium alloy is modified by Yb or Y with a relatively large atomic radius in a heavy rare earth element, and due to the addition of trace Yb or Y, not only is a relatively high solid solution strengthening effect generated, but also the stacking fault energy of the magnesium alloy can also be reduced; and the reduction of the stacking fault energy is beneficial to the activation of nonbasal slip and the promotion of formation of twin crystals and stacking faults, and furthermore, the plasticity and work hardening capacity of the magnesium alloy are improved. Therefore, the casting magnesium alloy obtained under the combined actions of various components and component contents has relatively high plasticity. The invention also provides a preparation method of the casting magnesium alloy.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a casting magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest structural material at present, magnesium alloy has a density of about 1.74-1.90g / cm 3 , only 1 / 4 of steel, 2 / 3 of aluminum alloy. Compared with other metal materials, magnesium alloy has high specific strength, specific stiffness, good machinability, electromagnetic protection characteristics, damping performance and thermal conductivity, and is easy to recycle. In the current shortage of iron ore, titanium ore and aluminum ore resources, it has become an inevitable trend to develop and utilize magnesium resources as alternative materials. Therefore, magnesium alloy is known as "21st century commercial green environmental protection and ecological metal structure material", and is being widely used in the fields of automobile industry, electronic communication ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/02C22C1/06C22C1/03
CPCC22C1/02C22C1/03C22C1/06C22C23/04Y02P10/122
Inventor 孟健张德平张栋栋邱鑫田政杨强管凯刘孝娟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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