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A kind of high strength and toughness mg-li-al-y alloy containing mixed rare earth rich in ce and preparation method thereof

A technology of mixing rare earths and alloys, applied in the field of metal materials, to improve the anti-aging softening ability, improve toughness and thermal stability, and avoid aging softening effects

Active Publication Date: 2019-09-17
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-strength and tough Mg-Li-Al-Y alloy containing Ce-rich mixed rare earths and a preparation method thereof for the deficiencies in existing magnesium-lithium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment relates to a high-strength and toughness Mg-Li-Al-Y alloy containing Ce-rich mixed rare earths, and the mass percentages of each component are: 8wt.%Li, 2wt.%Al, 1wt.%Y, 0.5wt.% Ce-rich mixed rare earth, the balance is Mg and unavoidable impurities. Among them, Y and Ce-rich mixed rare earth are added in the form of Mg-Y and Mg-15Ce-10La master alloy.

[0026] This embodiment relates to a method for preparing a high-strength magnesium-lithium alloy containing Ce-rich mixed rare earths. The process includes three stages of smelting, solution heat treatment and extrusion plastic deformation.

[0027] Before smelting, preheat the raw materials and molds in an oven to 200°C. After adding the materials, they are melted and heated to 640°C for mechanical stirring for 5 minutes, standing for 10 minutes and then casting. The entire smelting process is carried out under protective atmosphere conditions.

[0028] What follows is solution heat treatment and extrusion pla...

Embodiment 2

[0034] This embodiment relates to a high strength and toughness Mg-Li-Al-Y alloy containing Ce-rich mixed rare earths, the mass percentage of each component is: 12wt.% Li, 4.5wt.% Al, 2.2wt.% Y, 2wt. % Ce-rich mixed rare earth, the balance is Mg and inevitable impurities. Among them, Y and Ce-rich mixed rare earth are added in the form of Mg-Y and Mg-15Ce-10La master alloy.

[0035] This embodiment relates to a method for preparing a high-strength magnesium-lithium alloy containing Ce-rich mixed rare earths. The process includes three stages of smelting, solution heat treatment, and rolling plastic deformation.

[0036] Before smelting, the raw materials and molds are preheated to 220℃ in an oven. After feeding, they are melted and heated to 680℃ for mechanical stirring for 3 minutes, standing for 12 minutes and then casting. The whole smelting process is carried out under protective atmosphere.

[0037] What follows is solution heat treatment and rolling plastic deformation: the ma...

Embodiment 3

[0043] This embodiment relates to a high strength and toughness Mg-Li-Al-Y alloy containing Ce-rich mixed rare earths, the mass percentage of each component is: 10wt.% Li, 3wt.% Al, 1.5wt.% Y, 1.5wt. % Ce-rich mixed rare earth, the balance is Mg and inevitable impurities. Among them, Y and Ce-rich mixed rare earth are added in the form of Mg-Y and Mg-15Ce-10La master alloy.

[0044] This embodiment relates to a method for preparing a high-strength magnesium-lithium alloy containing Ce-rich mixed rare earths. The process includes three stages of smelting, solution heat treatment, and forging plastic deformation.

[0045] Before smelting, the raw materials and molds are preheated to 180℃ in an oven. After feeding, they are melted and heated to 650℃ for mechanical stirring for 3min, standing for 8min and then casting. The whole smelting process is carried out under protective atmosphere.

[0046] What follows is solution heat treatment and forging plastic deformation: the magnesium-lit...

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Abstract

The invention relates to high-strength-ductility Mg-Li-Al-Y alloy containing Ce-rich mixed rare earth and a preparation method thereof. The alloy comprises the following elements in percentage by weight: 8-12wt.% of Li, 1.5-4.5 wt.% of Al, 1-2.2wt.% of Y, 0.5-2wt.% of Ce-rich mixed rare earth, and the balance of magnesium and inevitable impurities. The preparation method for a magnesium-lithium alloy comprises three stages of smelting, solid-solution thermal treatment and plastic deformation, wherein solid-solution thermal treatment and plastic deformation are combined, i.e., obtained magnesium-lithium alloy cast ingot is cooled and then is subjected to plastic deformation after being subjected to solid-solution treatment, so that an ageing and softening phenomenon caused by uniform treatment before plastic deformation is avoided. Al, Y and Ce-rich mixed rare earth are added into the magnesium-lithium alloy, so that the effects of solid-solution strengthening and refined crystalline strengthening are achieved; and a high-temperature stable enhanced phase further can be separated out in matrix, and the high-strength-ductility magnesium-lithium alloy can be obtained through solid-solution thermal treatment and plastic deformation.

Description

Technical field [0001] The invention relates to a magnesium-lithium alloy, in particular to a high-strength and toughness Mg-Li-Al-Y alloy containing Ce-rich mixed rare earths and a preparation method thereof, and belongs to the technical field of metal materials. Background technique [0002] As the lightest metal structural material, magnesium-lithium alloy has received more and more attention. At the same time, it is widely used in military, aerospace and electronic products because of its high specific strength and rigidity, electromagnetic shielding and good machinability. field. However, the strength of magnesium-lithium alloys is very low, making the development of new high-strength magnesium-lithium alloys more and more urgent. [0003] The series of magnesium-lithium alloys such as LA and LAZ that have been developed at this stage have limited solid solubility of Al and Zn in the magnesium-lithium alloy, so the improvement of the alloy strength is also limited. Rare eart...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06
Inventor 梁新理刘文才吴国华张亮高占奎彭翔丁文江
Owner SHANGHAI JIAOTONG UNIV