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High-toughness magnesium-lithium alloy and preparation method of magnesium-lithium alloy

A technology of magnesium-lithium alloy and lithium alloy, which is applied in the field of high-strength and toughness magnesium-lithium alloy and its preparation, can solve the problems of increasing the strength of the alloy, decreasing the elongation, and limiting the application range of materials.

Active Publication Date: 2021-10-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research found that adding 1-3wt% Al element to the Mg-11Li alloy can greatly increase the strength of the alloy, and the tensile strength increases from 130MPa to 220MPa, but the elongation decreases sharply, from 36% to below 10%. , which limits the scope of application of the material. How to greatly improve the strength of magnesium-lithium alloys while maintaining their excellent plasticity has become a technical problem for such alloys.

Method used

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  • High-toughness magnesium-lithium alloy and preparation method of magnesium-lithium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]Step 1: Place the mold and smelt the raw materials (the smelting raw materials are composed of the following components by mass percentage: Al: 6%, Zn: 2%, Li: 7%, the balance is Mg and non-removable impurity elements) in order Put it into the crucible of the vacuum melting furnace, turn on the cooling circulating water, cover the vacuum melting furnace cover tightly, and start the vacuum device to pump the vacuum degree in the vacuum melting furnace to 1×10 -2 Below Pa, feed 99.99% high-purity argon gas to keep the pressure in the vacuum melting furnace at 0.04MPa~0.05MPa, then start the medium frequency induction heating device for heating, stir at 590℃~610℃ for 3 minutes, and then After standing at 660℃~680℃ for 7 minutes, turn off the medium frequency induction heating device to obtain the alloy melt, then control the crucible in the furnace through the external rocker, pour the alloy melt into the mold and cool it with the furnace. After the temperature drops, the v...

Embodiment 2

[0051] Step 1: Place the mold and smelt the raw materials (the smelting raw materials are composed of the following mass percentage components: Al: 4%, Zn: 2.5%, Li: 6%, the balance is Mg and non-removable impurity elements) in order Put it into the crucible of the vacuum melting furnace, turn on the cooling circulating water, cover the vacuum melting furnace cover tightly, and start the vacuum device to pump the vacuum degree in the vacuum melting furnace to 1×10 -2 Below Pa, feed 99.99% high-purity argon gas to keep the pressure in the vacuum melting furnace at 0.04MPa~0.05MPa, then start the medium frequency induction heating device for heating, stir at 590℃~610℃ for 4 minutes, and then After standing at 660℃~680℃ for 6 minutes, turn off the medium frequency induction heating device to obtain the alloy melt, then control the crucible in the furnace through the external rocker, pour the alloy melt into the mold and cool it with the furnace, and wait for the furnace to After ...

Embodiment 3

[0057] Step 1: Place the mold and smelt the raw materials (the smelted raw materials are composed of the following mass percentage components: Al: 8%, Zn: 1.0%, Li: 9%, the balance is Mg and non-removable impurity elements) in order Put it into the crucible of the vacuum melting furnace, turn on the cooling circulating water, cover the vacuum melting furnace cover tightly, and start the vacuum device to pump the vacuum degree in the vacuum melting furnace to 1×10 -2 Below Pa, feed 99.99% high-purity argon gas to keep the pressure in the vacuum melting furnace at 0.04MPa~0.05MPa, then start the medium frequency induction heating device for heating, stir at 590℃~610℃ for 2 minutes, and then After standing at 660℃~680℃ for 8 minutes, turn off the medium frequency induction heating device to obtain the alloy melt, then control the crucible in the furnace through the external rocker, pour the alloy melt into the mold and cool it with the furnace, and wait for the furnace to After t...

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Abstract

The invention discloses a high-toughness magnesium-lithium alloy and a preparation method of the magnesium-lithium alloy. The preparation method comprises the steps that (1) smelting raw materials are supplied to a vacuum smelting furnace to be smelted, and a magnesium-lithium alloy cast ingot is obtained; (2) extrusion deformation processing is carried out on the magnesium-lithium alloy cast ingot to obtain a first magnesium-lithium alloy plate; (3) the first magnesium-lithium alloy plate is subjected to hot rolling treatment, and a second magnesium-lithium alloy plate is obtained; and (4) the second magnesium-lithium alloy plate is subjected to stirring friction treatment, the high-toughness magnesium-lithium alloy is obtained, and in the step (1), the smelting raw materials are composed of the components in percentage by mass: 4% to 8% of Al, 1.0% to 2.5% of Zn, 5% to 9% of Li and the balance Mg and unremovable impurity elements. By adopting the preparation method to prepare the magnesium-lithium alloy, excellent plasticity of the magnesium-lithium alloy can be maintained while the strength of the magnesium-lithium alloy is greatly improved, and the high-toughness magnesium-lithium alloy is finally obtained, so that the requirements of the fields of aerospace and the like on ultra-light high-strength materials can be met.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a high-strength and tough magnesium-lithium alloy and a preparation method thereof. Background technique [0002] As a lightweight metal material, magnesium alloy has the advantages of high specific strength, high specific stiffness, easy machining, and good formability. Its density is 30% lower than that of aluminum, and it is the preferred metal for lightweight requirements. Among them, magnesium-lithium alloy, as the lightest metal structure material, meets the urgent demand for lightweight, and has received more and more attention in the fields of military, aerospace, and electronic products, and has been widely used in the fields of national defense and aerospace. The presence of lithium in magnesium-lithium alloys can further reduce the density of magnesium alloys to 1.30-1.65g / cm 3 , to further achieve lightweight. At the same time, the high lithium c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22F1/06B21C37/02C22C1/02
CPCC22C23/02C22C1/02C22F1/06B21C37/02
Inventor 周梦然陈高强张弓史清宇
Owner TSINGHUA UNIV