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High-strength and high-toughness magnesium-lithium alloy capable of achieving rapid age hardening and preparation method thereof

A technology of aging strengthening and magnesium-lithium alloys, which is applied in the field of metal materials, can solve problems such as difficulty in large-scale application, poor mechanical properties of magnesium-lithium alloys, and difficulty in meeting mechanical property requirements.

Active Publication Date: 2021-09-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention aims at the current situation that the existing magnesium-lithium alloys have poor mechanical properties, it is difficult to meet the requirements of the aerospace industry and other industries on the mechanical properties of magnesium-lithium alloys, and it is difficult to achieve large-scale applications, and provides a rapid aging strengthening High-strength and high-toughness magnesium-lithium alloy and preparation method thereof

Method used

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  • High-strength and high-toughness magnesium-lithium alloy capable of achieving rapid age hardening and preparation method thereof
  • High-strength and high-toughness magnesium-lithium alloy capable of achieving rapid age hardening and preparation method thereof
  • High-strength and high-toughness magnesium-lithium alloy capable of achieving rapid age hardening and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0030]Select the prepared ingot with the composition of Mg-8Gd-0.1Li, cut it to make a cylindrical ingot with a diameter of 35mm and a height of 34mm, and then carry out solid solution treatment, that is, place the sample in a place protected by argon gas. In the tubular heat treatment furnace, the temperature was raised to 485°C with the furnace, kept for 10 hours, then quenched in boiling water at 100°C, and cooled to room temperature. Then put the solid-solution cylindrical casting billet in the ingot barrel of the press and preheat it for 15 minutes to the extrusion temperature of 385 °C, and then perform hot extrusion deformation treatment at the extrusion speed of 2 mm / s and the extrusion ratio of 10:1 to obtain 12mm diameter bar. The rod was placed in an oil bath at a temperature of 200°C for aging heat treatment, and its age hardening behavior was tested. Finally, it was found that the rod sample reached the peak hardness at 72 hours. The extruded bar and the bar afte...

Embodiment 2

[0032] The procedure is the same as that of Example 1, except that the ingot with the composition of Mg-8Gd-0.5Li is cast, and the peak aging time of the rod at 200° C. is 42 hours. The yield strength, tensile strength and elongation of extruded bars are 180MPa, 247MPa and 20.2%, respectively; while the yield strength, tensile strength and elongation of peak aged bars are 290MPa, 330MPa and 6.0%, respectively.

Embodiment 3

[0034] The procedure is the same as that of Example 1, except that the ingot is cast with the composition of Mg-8Gd-1Li, and the peak aging time of the rod at 200°C is 12h. The yield strength, tensile strength and elongation of extruded bars are 230MPa, 279MPa and 20.0% respectively; while the yield strength, tensile strength and elongation of peak aged bars are 302MPa, 343MPa and 17.5%, respectively.

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Abstract

The invention discloses a high-strength and high-toughness magnesium-lithium alloy capable of achieving rapid age hardening and a preparation method thereof, and belongs to the technical field of metal materials. 0.1-3 wt% of element Li is added into a Mg-Gd alloy. An alloy matrix comprises an alpha-Mg phase, and a large amount of dense and discretely distributed nanoprecipitates exist in the alpha-Mg matrix. Under the aging condition of 200 DEG C, the peak aging time of the alloy is less than or equal to 12 hours. During peak aging, the yield strength of the alloy reaches 302 MPa; the tensile strength reaches 343 MPa; and the elongation reaches 17.5%. The preparation process of the magnesium-lithium alloy comprises the steps of casting under the protection of molten salt and inert atmosphere, and performing solution treatment, extrusion forming and aging heat treatment to obtain the magnesium-lithium alloy. Compared with the prior art, by simply controlling the content of element Li, the high-strength and high-toughness magnesium-lithium alloy capable of achieving rapid age hardening and the preparation method thereof can significantly enhance an age hardening reaction of the alloy, significantly improve the mechanical properties of the magnesium-lithium alloy, and shorten the peak hardening time.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a high-strength and high-toughness magnesium-lithium alloy capable of rapid aging strengthening and a preparation method thereof. Background technique [0002] Magnesium-lithium alloy is by far the lightest metal structural material, usually with a density of less than 1.70g / cm 3 , only 1 / 2 of that of aluminum alloy, and 3 / 4 of that of traditional magnesium alloy. In addition, magnesium-lithium alloys also have other advantages, such as high specific strength, high specific stiffness, good shock absorption, electromagnetic shielding and radiation resistance, etc., and have great application potential in industrial fields such as the aerospace industry. [0003] At present, there is a large gap between the practical application and potential of magnesium-lithium alloys. The main reason is that the existing magnesium-lithium alloys have generally low absolute strength, easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/02C22F1/06
CPCC22C23/06C22C1/02C22F1/06
Inventor 于子健许曦杜文博杜保田石康刘轲李淑波
Owner BEIJING UNIV OF TECH
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