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Method for preparing high-strength magnesium-lithium alloy by quick setting by using copper mold and copper mold

A magnesium-lithium alloy, high-strength technology, applied in the field of magnesium-lithium alloy preparation, can solve the problems of alloy plasticity reduction, and achieve the effects of high casting performance, fast heat conduction, and easy operation

Active Publication Date: 2015-09-30
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the plasticity of the alloy is often reduced while the strength is increased.

Method used

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  • Method for preparing high-strength magnesium-lithium alloy by quick setting by using copper mold and copper mold
  • Method for preparing high-strength magnesium-lithium alloy by quick setting by using copper mold and copper mold

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preparation example Construction

[0018] The preparation method of the high-strength magnesium-lithium-aluminum alloy material:

[0019] The high-strength magnesium-lithium alloy prepared by the copper mold rapid solidification technology in the present invention is to use commercially pure Mg, commercially pure Li, and commercially pure Al as raw materials, according to its mass percentage Li: 2~11% (wt%), Al: 3~ The ratio of 6% (wt%) and the balance being Mg is smelted in a vacuum induction melting furnace. Before smelting, the furnace is evacuated to a vacuum state (when the reading of the vacuum gauge is 0.01MPa), and then filled with argon for protection. The melting process has been carried out under the protection of argon atmosphere. The melting temperature is 650-750°C. The heat preservation and standing time is 20-40min. After standing still, the melt (casting temperature is about 700°C) is cast into a square mold made of copper with a thickness of 20-25mm. The inner cavity size of the copper mold ...

Embodiment 1

[0023] The chemical composition (mass percentage) of the alloy is: Li: 3%, Al: 6%, the total amount of inevitable impurities such as Fe, Cu, Ni, Si, etc. is less than 0.03%, and the balance is Mg.

[0024] The casting and processing techniques for preparing alloys are:

[0025] First, weigh the material according to the proportion, add the prepared Mg, Li and Al alloys into the steel crucible of the vacuum induction melting furnace, evacuate to 0.01MPa, and then fill it with argon. The melting process has been carried out under the protection of argon atmosphere. The melting temperature is about 720°C. After the metal is completely melted, keep it warm for 30 minutes, and then cast the melt (casting temperature is about 700°C) into the prepared copper cup with a thickness of 20mm and a length, width and height of 150mm*55mm*200mm (the inner cavity size is 120mm). *15mm*200mm) square mold, the punching ratio of the molten metal is 3 / 4, the rising speed of the molten metal in ...

Embodiment 2

[0027] The chemical composition (mass percentage) of the alloy is: Li: 8%, Al: 6%, the total amount of inevitable impurities such as Fe, Cu, Ni, Si, etc. is less than 0.03%, and the balance is Mg.

[0028] The casting and processing techniques for preparing alloys are:

[0029]First, weigh the material according to the proportion, add the prepared Mg, Li and Al alloys into the steel crucible of the vacuum induction melting furnace, evacuate to 0.01MPa, and then fill it with argon. The melting process has been carried out under the protection of argon atmosphere. The melting temperature is about 720°C. After the metal is completely melted, keep it warm for 30 minutes, and then cast the melt (casting temperature is about 700°C) into the prepared red copper with a thickness of 20mm and a length, width and height of 150mm*55mm*200mm (the inner cavity size is In a square mold of 120mm*15mm*200mm), the punching ratio of the molten metal is 3 / 4, the rising speed of the molten metal...

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Abstract

The invention provides a method for preparing a high-strength magnesium-lithium alloy by quick setting by using a copper mold and a copper mold. The method comprises the following steps: smelting Mg, Li and Al used as raw materials in a vacuum induction smelting furnace at 650-750 DEG C in an argon atmosphere, standing for 20-40 minutes while keeping the temperature, and casting the melt into the copper mold, wherein the rise speed of the molten metal in the die cavity is 30-60mm / s, and the casting time is 5-15 seconds; and after finishing the casting, carrying out furnace cooling on the casting in the copper mold to obtain the as-cast alloy. The copper mold is a 20-25mm-thick square mold made of red copper; the length:width ratio of the inner cavity of the copper mold is 4-12; and the punching ratio of the molten metal is 1 / 2-4 / 5. The mold, which is prepared from the red copper, implements quick setting of the alloy by utilizing the characteristics of high heat conductivity coefficient and quick heat conduction in the metallic copper, so that the composition and structure of the alloy are distributed more uniformly, the crystal grain is finer, and the casting has higher properties. The method has the advantages of simple technical process and wide applicability, and is easy to operate.

Description

technical field [0001] The invention relates to a preparation method of a magnesium-lithium alloy, in particular to a method for preparing a high-strength magnesium-lithium alloy by rapid solidification of a red copper mold. The invention also relates to a special copper mold for the method of preparing high-strength magnesium-lithium alloy by rapid solidification of the copper mold. Background technique [0002] Magnesium-lithium alloy is the lightest metal structural material so far. Due to its high specific strength, high specific stiffness, excellent electromagnetic shielding ability, shock absorption ability and recyclability, magnesium-lithium alloy has the advantages of reducing weight and energy consumption. etc. have far-reaching significance. These advantages make magnesium-lithium alloys have a wide range of application potentials in aerospace, automobile, electronics industry and other fields. In recent years, researchers have focused on improving the strength ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/02C22F1/06B22D15/00
Inventor 张中武邹云
Owner HARBIN ENG UNIV
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