High-strength two-phase ultralight magnesium lithium alloy and preparation method thereof

A magnesium-lithium alloy, high-strength technology, applied in the field of light metal material preparation, can solve the problems of poor alloy structure and performance stability, low industrialization promotion value, increase alloy density, etc., to improve mechanical properties, facilitate commercial application, Strength-enhancing effect

Inactive Publication Date: 2014-12-24
CENT SOUTH 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%, not only the density of the alloy is increased, but also the structure and performance stability of the alloy are poor, and the problem of overaging is easy to occur.
[0004] Rapid solidification-powder metallurgy can significantly refine grains and improve the strength and plasticity of alloys, but the cost is too high and the value of industrialization is not high

Method used

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  • High-strength two-phase ultralight magnesium lithium alloy and preparation method thereof
  • High-strength two-phase ultralight magnesium lithium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The alloy consists of the following components by mass percentage:

[0058] Li: 7.91%

[0059] Al: 2.83%

[0060] Y:0.31%

[0061] Ca: 0.22%

[0062] Unavoidable impurities ≤0.3%

[0063] The remainder is Mg.

[0064] Its preparation process is as follows:

[0065] Step 1 Ingredients

[0066] According to the designed alloy composition, prepare pure Mg, pure Li, pure Al, pure Ca and MgY master alloy respectively; and according to the total mass of the prepared pure Mg, pure Li, pure Al, pure Ca and MgY master alloy 10% of the covering agent is prepared; the covering agent is composed of anhydrous lithium chloride and anhydrous lithium fluoride in a mass ratio of 1:1; the purity of the pure Mg is ≥99.9%, the purity of the pure Li is ≥99.9%, The purity of pure Al is ≥99.9%, the purity of pure Ca is ≥99.9%; the MgY master alloy is composed of 72.4% Mg and 27.6% Y in terms of mass percentage;

[0067] Step two casting

[0068] The gas mixed with argon and sulfur he...

Embodiment 2

[0071] The alloy consists of the following components by mass percentage:

[0072] Li: 7.82%

[0073] Al: 2.93%

[0074] Y:0.45%

[0075] Ca: 0.36%

[0076] Unavoidable impurities ≤0.3%

[0077] The remainder is Mg.

[0078] Its preparation process is as follows:

[0079] Step 1 Ingredients

[0080] According to the designed alloy composition, prepare pure Mg, pure Li, pure Al, pure Ca and MgY master alloy respectively; and according to the total mass of the prepared pure Mg, pure Li, pure Al, pure Ca and MgY master alloy 10% of the covering agent is prepared; the covering agent is composed of anhydrous lithium chloride and anhydrous lithium fluoride in a mass ratio of 5:1; the purity of the pure Mg is ≥99.9%, the purity of the pure Li is ≥99.9%, The purity of pure Al is ≥99.9%, the purity of pure Ca is ≥99.9%; the MgY master alloy is composed of 76.6% Mg and 23.4% Y in terms of mass percentage;

[0081] Step two casting

[0082] The gas mixed with argon and sulfur he...

Embodiment 3

[0085] The alloy consists of the following components by mass percentage:

[0086] Li: 7.66%

[0087] Al: 3.11%

[0088] Y:0.52%

[0089] Ca: 0.44%

[0090] Unavoidable impurities ≤0.3%

[0091] The remainder is Mg.

[0092] Its preparation process is as follows:

[0093] Step 1 Ingredients

[0094] According to the designed alloy composition, prepare pure Mg, pure Li, pure Al, pure Ca and MgY master alloy respectively; and according to the total mass of the prepared pure Mg, pure Li, pure Al, pure Ca and MgY master alloy 10% of the covering agent is equipped with a covering agent; the covering agent is composed of anhydrous lithium chloride and anhydrous lithium fluoride in a mass ratio of 3:1; the purity of the pure Mg is ≥99.9%, the purity of the pure Li is ≥99.9%, The purity of pure Al is ≥99.9%, and the purity of pure Ca is ≥99.9%; the MgY master alloy is composed of 75% Mg and 25% Y in terms of mass percentage;

[0095] Step 2 Casting

[0096] The gas mixed with...

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Abstract

The invention relates to high-strength two-phase ultralight magnesium lithium alloy and a preparation method thereof and belongs to the technical field of light metal material preparation. The high-strength two-phase ultralight magnesium lithium alloy disclosed by the invention comprises the following components in mass percent: 6.0-9.0 percent of Li, 1.0-6.0 percent of Al, 0.01-1.0 percent of Y and 0.21-0.5 percent of Ca. According to the preparation method disclosed by the invention, magnesium lithium alloy is smelted in a general resistance furnace by adopting a flux-covering and gas protection method, so that the high-strength two-phase ultralight magnesium lithium alloy with the room temperature tensile strength of 162-190Mpa, the yield strength of 150-170Mpa, the percentage elongation of 15-30 percent and the density of 1.43-1.48g/cm<3> is obtained. The preparation process is simple; the obtained products are excellent in performance and industrial production is facilitated.

Description

technical field [0001] The invention relates to a high-strength dual-phase ultra-light magnesium-lithium alloy and a preparation method thereof, belonging to the technical field of light metal material preparation. Background technique [0002] In recent years, energy issues have become the focus of attention all over the world, and lightweight has become the development trend of modern vehicles and electronic industries. The magnesium-lithium alloy formed by adding lithium element (density 0.53g / cm3) to the magnesium alloy has a lower alloy density than the common AZ and ZK series magnesium alloys (the density of the AZ and ZK series magnesium alloys is about 1.8~ 1.9g / cm3), which has positive significance for lightweight. In addition to the advantages of low density, magnesium-lithium alloys also have high specific strength, specific stiffness, excellent shock resistance, good biocompatibility, and high-energy particle penetration resistance. They are used in aviation, ae...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03
Inventor 周海涛秦径为彭谦之周啸
Owner CENT SOUTH UNIV
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