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Gd-doped magnesium lithium alloy

A magnesium-lithium alloy and alloy technology, applied in the field of Gd-doped magnesium-lithium alloy, can solve the problems of increasing alloy density, poor stability of alloy structure and performance, and overaging

Inactive Publication Date: 2009-05-13
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the amount of Zn added is more than 3wt%, this not only increases the density of the alloy, but also has poor structure and performance stability of the alloy, which is prone to overaging problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The composition and weight percentage of the magnesium-lithium alloy are: Li: 8%, Al: 3%, Zn: 1.5%, Gd: 0.2%, and the balance is Mg. Melting takes place in a vacuum induction melting furnace. Before smelting, first evacuate the furnace to a vacuum state, then fill it with protective gas (argon), and then start smelting (the whole smelting process is under the protection of argon gas), and the smelted melt is cast into a metal mold to obtain cast state alloy. The obtained as-cast alloy is homogenized at 350±10° C., and then deformed (extruded or rolled) to obtain a deformed alloy. The deformed alloy is tested for its mechanical properties on an electronic universal testing machine, and the density of the alloy is tested by the Archimedes method.

[0013] At room temperature, the obtained magnesium-lithium alloy has a tensile strength of 210MPa, a yield strength of 195MPa, an elongation of 20%, and an impact toughness of 312KJ / m 2 , Density: 1.42g / cm 3 ; At 150°C, ten...

Embodiment 2

[0015] Other experimental conditions are the same as in Example 1. The composition and weight percentage of the magnesium-lithium alloy are: Li: 8%, Al: 3.5%, Zn: 1%, Gd: 0.5%, and the balance is Mg. The deformed alloy is tested for its mechanical properties on an electronic universal testing machine, and the density of the alloy is tested by the Archimedes method.

[0016] At room temperature, the obtained magnesium-lithium alloy has a tensile strength of 228MPa, a yield strength of 210MPa, an elongation of 23%, and an impact toughness of 330KJ / m 2 , the density is: 1.44g / cm 3 ; At 150°C, tensile strength: 168MPa, yield strength: 154MPa, elongation: 19%.

Embodiment 3

[0018] Other experimental conditions are the same as in Example 1. The composition and weight percentage of the magnesium-lithium alloy are: Li: 8%, Al: 3.5%, Zn: 1%, Gd: 1%, and the balance is Mg. The deformed alloy is tested for its mechanical properties on an electronic universal testing machine, and the density of the alloy is tested by the Archimedes method.

[0019] At room temperature, the obtained magnesium-lithium alloy has a tensile strength of 240MPa, a yield strength of 228MPa, an elongation of 25%, and an impact toughness of 350KJ / m 2 , the density is: 1.48g / cm 3 ; At 150°C, tensile strength: 174MPa, yield strength: 162MPa, elongation: 22%.

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Abstract

The invention provides a Gd-doped magnesium-lithium alloy, which comprises the following components in weight percent: 6 to 9 percent of Li, 2 to 5 percent of Al, 0.5 to 2 percent of Zn, 0.2 to 1.5 percent of Gd, and the balance being Mg. The rare earth GD is introduced into the magnesium-lithium alloy on the basis of the addition of common magnesium-lithium alloy strengthening elements Al and Zn. Al is the main strengthening element of the alloy, while Zn is also the strengthening element of the alloy and changes the plasticity of the alloy simultaneously; and the Gd can generate solution strengthening action to improve the microstructure of the alloy and refine crystal grains. At the same time, the improvement of Li content allows the alloy to be positioned in an alpha+beta two-phase region, thereby improving the plasticity of the alloy and reducing density of the alloy simultaneously.

Description

(1) Technical field [0001] The invention relates to an alloy, specifically a Gd-doped magnesium-lithium alloy. (2) Background technology [0002] Mg-Li alloy is a new type of alloy, they are as light as plastic and as strong as metal, their deformability (forgeability) is better than other magnesium alloys, and they have good shock absorption performance and resistance to high-energy particle penetration, so in Communication electronics industry, military industry and aerospace industry have broad development prospects. [0003] However, due to the low strength of magnesium-lithium alloys, and poor aging stability and corrosion resistance, the development of magnesium-lithium alloys is restricted. Alloying is usually used to improve the properties of the alloy. The most commonly used reinforcing elements are Al, Zn and rare earth elements. Bin Liu et al. (Bin Liu, Milin Zhang, Ruizhi Wu, Materials Science and Engineering A 487 (2008) 347-351) prepared Mg-14Li-1Al-xNd magne...

Claims

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Application Information

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IPC IPC(8): C22C23/00
Inventor 王君门枢李茹民张密林景晓燕刘岩峰
Owner HARBIN ENG UNIV
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