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High-performance deformed rare earth-magnesium-lithium alloy based on island-shaped beta1 nanometer precipitated phase strengthening

A nano-precipitated phase, rare earth magnesium technology, applied in the field of metal materials, can solve the problems of poor strength and difficult large-scale application of magnesium-lithium alloys, and achieve the effects of improving mechanical properties, low cost, and stable chemical properties

Active Publication Date: 2020-12-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention aims at the problem that the existing magnesium-lithium alloy has poor strength and is difficult to realize large-scale application, and provides a method based on an island-like β 1 Nano-precipitated phase-strengthened high-performance deformed rare-earth magnesium-lithium alloy and preparation method thereof

Method used

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  • High-performance deformed rare earth-magnesium-lithium alloy based on island-shaped beta1 nanometer precipitated phase strengthening
  • High-performance deformed rare earth-magnesium-lithium alloy based on island-shaped beta1 nanometer precipitated phase strengthening
  • High-performance deformed rare earth-magnesium-lithium alloy based on island-shaped beta1 nanometer precipitated phase strengthening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The ingot with the composition of Mg-8Gd-2Y-1Zn-6Li is selected, and it is processed into a cylindrical casting ingot with a diameter of 35mm and a height of 34mm (deformed rare earth magnesium-lithium alloy in lithium fluoride and lithium chloride Molten salt covering and SF 6 :CO 2 Cast into ingots under a mixed protective atmosphere, the casting temperature is 680 ° C ~ 720 ° C, the same below), and perform homogenization treatment, that is, place the sample in a tubular heat treatment furnace protected by argon, and heat it up to 520 ° C with the furnace, and keep it for 18 hours , and then quenched in boiling water at 100°C, and cooled to room temperature. Then put the homogenized cylindrical casting billet in the ingot barrel of the press and preheat it for 8 minutes to the extrusion temperature of 250 °C, and then perform hot extrusion deformation treatment at an extrusion speed of 1 mm / s and an extrusion ratio of 10:1 to obtain 12mm diameter bar. The bar is p...

Embodiment 2

[0033] Its steps are the same as in Example 1, except that the extrusion temperature is 270°C. Its yield strength is 202MPa, tensile strength is 243MPa, and elongation is 10.7%.

Embodiment 3

[0035] The steps are the same as in Example 1, except that the extrusion temperature is 290° C., and the extrusion ratio is changed to 25:1. Its yield strength is 179MPa, tensile strength is 225MPa, and elongation is 10.7%.

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Abstract

The invention discloses a high-performance deformed rare earth-magnesium-lithium alloy based on island-shaped beta1 nanometer precipitated phase strengthening, and belongs to the technical field of metal materials. The rare earth-magnesium-lithium alloy comprises Mg, Gd, Y, Zn and Li elements, wherein an alloy matrix is composed of alpha-Mg or alpha-Mg plus beta-Li, and a large number of nanoscaleisland-shaped beta1 precipitated phases which are densely and discretely distributed exist in the alpha-Mg matrix. The island-shaped beta1 nanometer precipitated phases generated through a dynamic precipitation mechanism in thermal deformation, and the strength of a magnesium-lithium alloy can be effectively improved through the precipitation strengthening effect. A preparation process comprisesthe steps that the magnesium-lithium alloy is cast under the protection of fused salt and an inert atmosphere, and the rare earth-magnesium-lithium alloy is obtained through extrusion molding after solution treatment. Compared with the prior art, the production efficiency, yield strength, tensile strength and elongation of the alloy are all improved in a breakthrough mode.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a 1 A high-performance deformed rare-earth magnesium-lithium alloy strengthened by nano-precipitation phase and a preparation method thereof. Background technique [0002] Magnesium-lithium alloy is the lightest structural metal material, usually with a density of less than 1.70g / cm 3 . Compared with other metal structural materials, magnesium-lithium alloys have a series of advantages such as high specific strength, specific stiffness, shock absorption, electromagnetic shielding and radiation resistance, easy cutting, easy recycling, etc., and are widely used in aerospace and national defense military industries. The field has extremely important application value and broad application prospects. [0003] Due to the difference in lithium content, the magnesium-lithium alloy matrix will also undergo corresponding changes. Specifically, when the Li content is lower than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/06C22F1/02C22F1/06
CPCC22C23/00C22C23/06C22F1/002C22F1/02C22F1/06
Inventor 于子健杜文博刘轲李淑波王朝辉杜宪赵晨辰
Owner BEIJING UNIV OF TECH
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