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A kind of high-strength and high-modulus dual-phase magnesium-lithium alloy and preparation method thereof

A technology of magnesium-lithium alloy and high modulus, which is applied in the field of magnesium alloy as a metal material, can solve problems such as low elongation, unreached strength, and unreached strength, so as to improve elastic modulus and strength, and achieve good solid solution strengthening Effect, the effect of improving the modulus of elasticity

Active Publication Date: 2022-07-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Chinese patent CN107523770B discloses a heat treatment process for improving the performance of a long-range structured ordered phase-strengthened dual-phase magnesium-lithium alloy. The synergistic improvement of strength and elastic modulus by solution treatment and aging treatment is not considered, so the tensile strength of the obtained magnesium-lithium alloy is 120-180MPa lower than 320MPa, the yield strength is 100-150MPa lower than 280MPa, and the elongation is lower than 16 %, the magnesium-lithium alloy obtained by this patent still cannot meet the demand for material performance in practical industrial applications, and needs to be improved
[0008] Chinese patent CN112680641A discloses a Zn-containing dual-phase magnesium-lithium alloy in solid solution state and its preparation method and application. The preparation method is to effectively improve the mechanical strength of the dual-phase magnesium-lithium alloy by adopting Zn element and solid solution heat treatment process. However, The tensile strength of the finally obtained Zn-containing dual-phase magnesium-lithium alloy is 221-302MPa lower than 320MPa and the yield strength 168-275MPa is lower than 280MPa, and the elongation is far less than 16%. Therefore, although it adopts solution heat treatment to improve the strength of the alloy, However, the strength has not yet reached the desired target for practical applications; in addition, it uses a large amount of Zn elements (>8wt.%) to improve the alloy strength, because the density of Zn is relatively high, adding a large amount of Zn elements will cause the increase of the density of the Mg-Li alloy , cannot meet the technical requirements of low density, high specific strength and high specific modulus of magnesium-lithium alloys, thus limiting its engineering application range
[0009] Chinese patent CN113430436A discloses a low-density, high-elastic-modulus as-cast dual-phase magnesium-lithium alloy and its preparation method. The preparation method is to increase the elastic modulus of the dual-phase magnesium-lithium alloy material by in-situ self-generated quasi-crystalline phases, but its The elastic modulus of the obtained magnesium-lithium alloy is still lower than 50GPa, which is far from meeting the needs of practical applications. It is also expected to significantly increase the modulus of magnesium-lithium alloys, thereby promoting the practical engineering application of ultra-light magnesium-lithium alloys
In addition, the α+β duplex structure with the optimal ratio of α phase and β phase can be seen from the examples, the highest tensile strength obtained is 240MPa lower than 320MPa, the highest yield strength is 190MPa lower than 280MPa, and the strength has not yet reached Desired Goals for Practical Applications
[0011] In summary, in order to meet the technical requirements for high strength or high elongation of dual-phase magnesium-lithium alloys in the research of magnesium-lithium alloys, microalloying, heat treatment, and thermal processing have been adopted, but they cannot control the strength of dual-phase magnesium. The low density of lithium alloys synergistically improves the strength and elongation of the dual-phase magnesium-lithium alloy, making the tensile strength, yield strength and elongation highly matched, and the elastic modulus is not less than 60GPa

Method used

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  • A kind of high-strength and high-modulus dual-phase magnesium-lithium alloy and preparation method thereof
  • A kind of high-strength and high-modulus dual-phase magnesium-lithium alloy and preparation method thereof
  • A kind of high-strength and high-modulus dual-phase magnesium-lithium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The chemical composition of a high-strength and high-modulus dual-phase magnesium-lithium alloy is: Gd: 2.0wt.%, Al: 4.0wt.%, Y: 3.0wt.%, Li: 8.0wt.%, Zn: 3.0 wt.%, Mn: 1.0 wt.% The balance is Mg and inevitable impurities.

[0066] The preparation method of the high-strength and high-modulus dual-phase magnesium-lithium alloy comprises the following steps:

[0067] S1, raw material preparation stage

[0068] According to the mass percentage of raw material chemical components in the high-strength and high-modulus dual-phase magnesium-lithium alloy, the total weight is Mg-28wt.%Gd master alloy containing 2wt.%Gd, Mg-28wt.%Gd containing 3wt.%Y. %Y master alloy, Mg-28wt.%Mn master alloy with 1wt.%Mn, 4wt.% pure Al, 8wt.% pure Li, 3wt.% pure Zn, balance pure Mg; and surface oxides removed ;

[0069] S2, preheating raw material stage

[0070] Put the weighed raw materials and stainless steel crucible in step S1 into a heat treatment furnace and preheat at 200°C for 2 hou...

Embodiment 2

[0081] The chemical composition of a high-strength and high-modulus dual-phase magnesium-lithium alloy is as follows: Gd: 3.0wt.%, Al: 5.0wt.%, Y: 2.0wt.%, Li: 5.0wt.%, Zn: 4.0 wt.%, Mn: 3.0 wt.% The balance is Mg and inevitable impurities.

[0082] The preparation method of the high-strength and high-modulus dual-phase magnesium-lithium alloy comprises the following steps:

[0083] S1, raw material preparation stage

[0084] According to the mass percentage of raw material chemical components in the high-strength and high-modulus dual-phase magnesium-lithium alloy, the total mass is Mg-23wt.%Gd master alloy containing 3wt.%Gd, Mg-40wt.%Gd containing 2wt.%Y. %Y master alloy, Mg-20wt.%Mn master alloy with 3wt.%Mn, 5wt.%pure Al, 5wt.%pure Li, 4wt.%pure Zn, balance pure Mg; and surface oxides removed ;

[0085] S2, preheating raw material stage

[0086] Put the weighed raw materials and graphite crucible in step S1 into a heat treatment furnace and preheat at 220 ° C for 1.5 ...

Embodiment 3

[0097] The chemical composition of a high-strength and high-modulus dual-phase magnesium-lithium alloy is: Gd: 1.8wt.%, Al: 4.2wt.%, Y: 4.9wt.%, Li: 7.8wt.%, Zn: 1.8 wt.%, Mn: 3.1 wt.% The balance is Mg and inevitable impurities.

[0098] The preparation method of the high-strength and high-modulus dual-phase magnesium-lithium alloy comprises the following steps:

[0099] S1, raw material preparation stage

[0100] According to the mass percentage of raw material chemical components in the high-strength and high-modulus dual-phase magnesium-lithium alloy, the total weight is Mg-43wt.%Gd master alloy containing 2wt.%Gd, Mg-35wt.%Gd containing 5wt.%Y. %Y master alloy, Mg-25wt.%Mn master alloy with 3wt.%Mn, Mg-48wt.%Li master alloy with 8wt.%Li, 4wt.% pure Al, 2wt.% pure Zn, balance is pure Mg; and removes surface oxides;

[0101] S2, preheating raw material stage

[0102] Put the weighed raw materials and BN crucibles in step S1 into a heat treatment furnace and preheat at 1...

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Abstract

The invention discloses a high-strength and high-modulus dual-phase magnesium-lithium alloy and a preparation method, and belongs to the technical field of metal material magnesium alloys. The mass percentage of the high-strength and high-modulus dual-phase magnesium-lithium alloy is: Gd: 0.05-4wt.%, Al: 0.5-5wt.%, Y: 0.05-8wt.%, Li: 5-10wt.%. %, Zn: 0-5wt.%, Mn: 0.05-4wt.% The balance is Mg and inevitable impurities; wherein: the content of Zn element cannot be selected as 0. The preparation method includes a raw material preparation stage, a preheating raw material stage, a heat treatment furnace atmosphere adjustment, a vacuum smelting stage, a vacuum tube furnace atmosphere adjustment and a heat treatment stage. The invention adopts the combination of microalloying and heat treatment, which can synergistically improve the strength, elongation and elastic modulus of the dual-phase magnesium-lithium alloy while controlling the low density of the dual-phase magnesium-lithium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal material magnesium alloys, and relates to a high-strength and high-modulus dual-phase magnesium-lithium alloy and a preparation method. Background technique [0002] Magnesium alloys have the characteristics of light weight, high specific strength and good biocompatibility. With the intensification of the global energy resource crisis and the rapid development of the automobile, aerospace and 3C industries, researchers have to turn their attention to lightweight, environmentally friendly and energy-saving high-performance metal structural parts, and have successively developed various new high-performance metal structural parts. Magnesium alloys have promoted the further industrial production and application of magnesium alloy materials. [0003] Magnesium-lithium alloys are by far the least dense metal structural materials, also known as ultra-light alloys. Due to the low density of lithium eleme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/02C22F1/06C22C23/02C22C23/06C22C23/04
CPCC22C23/00C22C1/03C22F1/02C22F1/06C22F1/002C22C23/02C22C23/06C22C23/04
Inventor 王俊升田光元杨兴海张弛王硕苏辉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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