Magnesium-lithium alloy with enhanced long-period structure phase and preparation method thereof

A long-period structure, magnesium-lithium alloy technology, applied in the field of magnesium-lithium alloys, can solve the problems of deterioration of mechanical properties, no breakthrough progress, unstable alloy properties, etc., to achieve low density, good heat resistance, high The effect of the modulus of elasticity

Active Publication Date: 2013-05-29
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature reports, adding a small amount of various RE (rare earth) elements, Ag, Cu, Ca, etc. to Mg-Li-Al(-Zn) can lead to the formation of high melting point intermetallic phases and / or inhibit the formation of softening phases, making the alloy properties It has been improved to a certain extent, but the performance of the obtained alloy (especially the alloy with high lithium content) is not stable, and the mechanical properties will gradually deteriorate with time during the placement process
These studies have played a certain guiding role in improving the performance of traditional magnesium-lithium alloys, but so far they have not brought breakthroughs.

Method used

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  • Magnesium-lithium alloy with enhanced long-period structure phase and preparation method thereof
  • Magnesium-lithium alloy with enhanced long-period structure phase and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The chemical composition (mass percentage) of the alloy is: 7.6% Li, 5.7% Y, 2.0 Zn, the balance is Mg, and its purity is above 99.95.

[0027] The casting, heat treatment and processing processes for preparing alloys are:

[0028]First, according to the designed alloy composition, prepare Mg, Li, Zn, Mg-20%Y master alloy in proportion. In order to ensure the quality of the ingot and reduce the introduction of impurities as much as possible, the surface of the furnace charge is polished to remove the surface oxide scale before loading the furnace. Among them, due to the high chemical activity of Li element, it must be sealed and stored or placed in kerosene, and it must be prepared immediately after use. The Li used in this example is stored in kerosene. After the Li block is cut, the surface of the lithium block is wiped clean with filter paper, and put into the furnace in the shortest time, and then the furnace cover is put on to vacuum the furnace. Put the processe...

Embodiment 2

[0035] The chemical composition (mass percentage) of the alloy is: 7.9% Li, 8.0% Y, 3.1% Zn, the balance is Mg, and its purity is above 99.95.

[0036] The melting and casting conditions and process refer to Example 1, the difference lies in: the contents of Li, Y, and Zn are different.

[0037] The heat treatment conditions and process refer to Example 1, the difference is that: the heat treatment temperature is 500° C., and the time is 7 hours.

[0038] Extrusion processing conditions and technology refer to embodiment 1. Finally, a deformed Mg-Li alloy material reinforced by LPSO structure is obtained.

[0039] The high-performance magnesium-lithium alloy of present embodiment gained, its mechanical property is:

[0040] Room temperature: tensile strength: 264MPa, yield strength: 199MPa, elongation 35%.

[0041] 150°C: Tensile strength: 117MPa, yield strength: 96MPa, elongation 38%.

Embodiment 3

[0043] The chemical composition (mass percentage) of the alloy is: 7.8% Li, 9.6% Y, 3.8% Zn, the balance is Mg, and its purity is above 99.95.

[0044] The melting and casting conditions and process refer to Example 1, the difference lies in: the contents of Li, Y, and Zn are different.

[0045] The heat treatment conditions and process refer to Example 1, except that the heat treatment temperature is 500° C. and the time is 9 hours.

[0046] Extrusion processing conditions and technology refer to embodiment 1. Finally, a deformed Mg-Li alloy material reinforced by LPSO structure is obtained.

[0047] The high-performance magnesium-lithium alloy of present embodiment gained, its mechanical property is:

[0048] Room temperature: tensile strength: 281MPa, yield strength: 206MPa, elongation: 37%.

[0049] 150°C: tensile strength: 128MPa, yield strength: 111MPa, elongation: 46%.

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Abstract

The invention provides a magnesium-lithium alloy with an enhanced long-period structure phase and a preparation method thereof. The method adopts pure Mg, pure Li, pure Zn and Mg-Y intermediate alloy as raw materials and comprises the following steps of: proportionally putting the raw materials into a vacuum induction melting furnace, filling a protective gas, heating and smelting, and casting the smelted melt into a metal die to obtain an as-cast alloy; performing heat treatment at 490-510 DEG C for 5-10 hours to obtain a casting alloy with an LPSO structure phase through phase transformation; and performing extrusion deformation processing at 260-280 DEG C to obtain a magnesium-lithium alloy which comprises the following components in percentage by mass: 5.5-10% of Li, 4-10% of Y, 1-4% of Zn, less than 0.03% of inevitable impurities Fe, Cu, Ni and Si in total and the balance of Mg, wherein the mass content ratio of Y to Zn is 1-6. According to the invention, by reasonably selecting the alloy elements, the LPSO structure phase is introduced into a magnesium-lithium alloy substrate, and a magnesium-lithium alloy material with low density, high strength, high plasticity and good heat resistance is prepared.

Description

technical field [0001] The invention relates to a magnesium-lithium alloy, and the invention also relates to a preparation method of the magnesium-lithium alloy. Background technique [0002] Magnesium-lithium alloy is by far the lightest metal structural material, and its density is similar to that of engineering plastics, so it is also called ultra-light alloy. Magnesium-lithium alloy has the characteristics of low density, good processing deformation ability, anti-seismic and anti-penetration of high-energy particles, etc., and has broad application prospects in the fields of aerospace, weaponry, nuclear energy applications, and national economy. However, magnesium-lithium alloys have not been widely used so far. One of the main reasons is that traditional magnesium-lithium alloys have low absolute strength and poor heat resistance, and the performance of the alloy is unstable. Some alloys with high lithium content can be overaged even at room temperature and deteriorate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/06C22C1/03C22F1/06
Inventor 张景怀冷哲张丽巫瑞智张密林
Owner HARBIN ENG UNIV
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