A kind of magnesium-lithium alloy with low density, high strength and high modulus and preparation method thereof

A magnesium-lithium alloy, high-strength technology, applied in the field of magnesium alloy metal materials, can solve the problems of impurity introduction, increase of Mg-Al-Li ingot density, loss of raw materials, etc., and achieve the effect of grain refinement

Active Publication Date: 2022-07-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem solved by the present invention is that the alloy systems such as Mg-Al-Li and Mg-Al-Zn in the prior art have poor mechanical properties and thermal stability, and the strength, plasticity and thermal stability cannot be well matched, and a large amount of rare earth added Alloying elements will increase the density of alloy system ingots such as Mg-Al-Li, Mg-Al-Zn, and the CO used in the preparation method 2 +SF 6 The protection of mixed gas and fluorine-containing covering agent not only makes the Li element volatilize during the smelting process, but also causes the loss of raw materials and the introduction of impurities due to the reaction, polluting the environment

Method used

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  • A kind of magnesium-lithium alloy with low density, high strength and high modulus and preparation method thereof
  • A kind of magnesium-lithium alloy with low density, high strength and high modulus and preparation method thereof
  • A kind of magnesium-lithium alloy with low density, high strength and high modulus and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The chemical composition of a low-density, high-strength, and high-modulus magnesium-lithium alloy is: Gd: 1.5wt.%; Al: 5wt.%; Y: 4wt.%; Li: 10wt.%; Zr: 0.5 wt.%; the total amount of impurity elements Si, Fe, Cu, Ni, and Mn is less than 0.03 wt.%; the remainder is Mg.

[0057] The preparation method of the low-density, high-strength, and high-modulus magnesium-lithium alloy of the above-mentioned components comprises the following steps:

[0058] S1, alloy ingredients

[0059] According to the ratio of magnesium-lithium alloy raw materials, the total mass of Mg-30wt.%Gd master alloy containing 1.5wt.%Gd, the Mg-30wt.%Y master alloy containing 4wt.%Y, and the Mg-30wt.%Y master alloy containing 0.5wt.%Zr were prepared. Mg-30wt.% Zr master alloy, 10wt.% pure Li, 5wt.% pure aluminum foil, and the balance is pure magnesium; wherein, pure lithium is wrapped with pure aluminum foil;

[0060] S2, baking material

[0061] Preheat the prepared raw materials (pure magnesium, Mg...

Embodiment 2

[0068] The chemical composition of a low-density, high-strength, and high-modulus magnesium-lithium alloy is calculated by mass percentage: Gd: 1wt.%; Al: 6wt.%; Y: 5wt.%; Li: 15wt.%; Zr: 0.5wt% %; the total amount of impurity elements Si, Fe, Cu, Ni, and Mn is less than 0.03wt.%; the remainder is Mg.

[0069] The preparation method of the low-density, high-strength, and high-modulus magnesium-lithium alloy of the above-mentioned components comprises the following steps:

[0070] S1, alloy ingredients

[0071] According to the ratio of magnesium-lithium alloy raw materials, the total mass of Mg-20wt.%Gd master alloy containing 1wt.%Gd, the Mg-20wt.%Y master alloy containing 5wt.%Y, and the Mg containing 0.5wt.%Zr were prepared. -20wt.% Zr master alloy, 15wt.% pure Li, 6wt.% pure aluminum foil, and the balance is pure magnesium; in which, pure lithium is wrapped with pure aluminum foil;

[0072] S2, baking material

[0073] Preheat the prepared raw materials (pure magnesium,...

Embodiment 3

[0080] The chemical composition of a low-density, high-strength, and high-modulus magnesium-lithium alloy is: Gd: 3wt.%; Al: 4wt.%; Y: 8wt.%; Li: 15wt.%; Zr: 0.5wt% %; the total amount of impurity elements Si, Fe, Cu, Ni, and Mn is less than 0.03wt.%; the remainder is Mg.

[0081] The preparation method of the low-density, high-strength, and high-modulus magnesium-lithium alloy of the above-mentioned components comprises the following steps:

[0082] S1, alloy ingredients

[0083] According to the ratio of magnesium-lithium alloy raw materials, the total mass of Mg-30wt.%Gd master alloy containing 3wt.%Gd, the Mg-30wt.%Y master alloy containing 8wt.%Y, and the Mg containing 0.5wt.%Zr were prepared. -30wt.% Zr master alloy, 15wt.% pure Li, 4wt.% pure aluminum foil, and the balance is pure magnesium; in which, pure lithium is wrapped with pure aluminum foil;

[0084] S2, baking material

[0085] Preheat the prepared raw materials (pure magnesium, Mg-Gd master alloy, Mg-Y mast...

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Abstract

The invention discloses a low-density, high-strength and high-modulus magnesium-lithium alloy and a preparation method, which belong to the technical field of metal material magnesium alloys. The chemical composition of the low-density, high-strength, and high-modulus magnesium-lithium alloy in percentage by mass is: Gd: 0.5-5wt.%, Al: 0.5-6wt.%, Y: 0.5-10wt.%, Li: 8- 16wt.%, Zr: 0-1wt.%, the balance is Mg and inevitable impurities; wherein: the content of Zr element cannot be 0. The preparation method includes alloy batching, baking material, vacuum melting casting and heat treatment. The invention solves the modulus improvement that cannot be achieved by traditional Mg-Al-Zn, Mg-Gd-Y-Zr, Mg-Li-Al magnesium alloys, adopts automatic vacuum melting to precisely control the composition, has no environmental pollution, and avoids oxidative burning Damage and other problems, the preparation process is safe and reliable, and the component process performance is repeatable.

Description

technical field [0001] The invention belongs to the technical field of metal material magnesium alloys, and relates to a magnesium-lithium alloy with low density, high strength and high modulus and a preparation method. Background technique [0002] Magnesium alloy has the characteristics of light weight, high specific strength and good biocompatibility, and it is also recyclable and reusable. It is a green engineering material in the 21st century and has wide application prospects in aerospace, automobile, weapons and armor, etc. . However, due to the close-packed hexagonal structure of magnesium, its lattice slip coefficient is small, and it shows poor plasticity in extrusion, rolling, forging, stamping and other processes. Therefore, the research of magnesium-lithium alloys has attracted much attention. [0003] The study found that the density of LA series magnesium-lithium alloys is 1.35-1.65g / cm 3 Among them, it is the lightest metal structural material at present. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C21D1/18C22F1/06C22F1/02C22C23/06C22B9/04C22B9/00
CPCC22C23/00C22C1/03C22F1/002C22F1/06C22F1/02C22C23/06C22B9/04C22B9/006
Inventor 王俊升田光元杨兴海张弛王硕
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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