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A kind of magnesium aluminum alloy and preparation method thereof

A magnesium-aluminum alloy and alloy technology, which is applied in the field of high-strength and high-plastic magnesium-aluminum alloy and the preparation method thereof, can solve problems such as gaps, and achieve the effects of enhancing effect, increasing strength, and increasing volume fraction.

Active Publication Date: 2018-11-20
南通众福新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above inventions are all dedicated to improving the performance of magnesium-aluminum alloys, especially the strength performance. However, the tensile strength of the alloys of these inventions is below 400MPa, and there is still a large gap between their strength and the current long-term engineering materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of raw materials: prepare more than 99.9% high-purity magnesium and high-purity aluminum, and nano-SiC with an average particle size of 110;

[0035] (2) Smelting alloy: Mix high-purity magnesium and aluminum in an atomic ratio of 3:1, 2 Melting in mixed gas with SF6, where CO 2 The volume ratio to SF6 is 100:1; During the melting process, add 3.2% of the alloy mass fraction of nano-SiC, keep the temperature at 700 °C, and use the ultrasonic method for dispersion;

[0036] (3) Slowly cool the alloy ingot at a cooling rate of 0.3k per second; maintain a vacuum state during the cooling process with a vacuum degree of 3torr;

[0037] (4) After cooling, process the alloy ingot into a disc shape;

[0038] (5) Put the coarse-grained alloy disc processed in step (4) into the space formed by the grooves in the upper and lower anvils, apply 5 GPa high pressure to the alloy, and rotate the anvil at a speed of 5 revolutions per minute To twist the alloy disc, make it twist...

Embodiment 2

[0044] (1) Preparation of raw materials: prepare more than 99.9% of high-purity magnesium and high-purity aluminum, and SiC with an average particle size of 80 nanometers;

[0045] (2) Alloy smelting: Mix high-purity magnesium and aluminum according to the atomic ratio of 2:1, in CO 2 Melting in mixed gas with SF6, where CO 2 The volume ratio to SF6 is 80:1; during the melting process, add 5% of the alloy mass fraction of nano-SiC, keep the temperature at 700 °C, and use the ultrasonic method to disperse;

[0046] (3) Slowly cool the alloy ingot at a cooling rate of 0.5k per second; maintain a vacuum state during the cooling process, with a vacuum of 3torr;

[0047] (4) After cooling, process the alloy ingot into a disc shape;

[0048] (5) Put the coarse-grained alloy disc processed in step (4) into the space formed by the grooves in the upper and lower anvils, apply a high pressure of 1.5 GPa to the alloy, and rotate it at a speed of 2 revolutions per minute. The anvil twists the all...

Embodiment 3

[0054] (1) Preparation of raw materials: prepare more than 99.9% high-purity magnesium and high-purity aluminum, and SiC with an average particle size of 60 nanometers;

[0055] (2) Smelting alloy: The high-purity magnesium and aluminum are blended according to the atomic ratio of 1.5:1, in the CO 2 Smelting in mixed gas with SF6, of which CO 2 The volume ratio to SF6 is 50:1; during the melting process, add 1.8% of the alloy mass fraction of nano-SiC, keep the temperature at 700 °C, and use the ultrasonic method for dispersion;

[0056] (3) Slowly cool the alloy ingot at a cooling rate of 0.2k per second; maintain a vacuum state during the cooling process, with a vacuum of 4torr;

[0057] (4) After cooling, process the alloy ingot into a disc shape;

[0058] (5) Put the coarse-grain alloy disc processed in step (4) into the space formed by the grooves in the upper and lower anvils, apply a high pressure of 5 GPa to the alloy, and rotate the anvil at a speed of 2 revolutions per minute...

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Abstract

A magnesium-aluminum alloy and a preparation method thereof. In the invention, nano-silicon carbide is mixed into the magnesium-aluminum alloy to obtain a high-strength magnesium-aluminum alloy. The magnesium aluminum alloy is composed of magnesium, aluminum elements and nano silicon carbide; the atomic ratio of magnesium aluminum is between 3:1 and 1:1.5; the average diameter of silicon carbide is below 200 nanometers, and the average grain size of magnesium aluminum alloy is 80 Below nanometer, the tensile strength of the alloy can reach more than 400MPa, and the elongation rate is more than 40%. The magnesium-aluminum alloy is prepared through the steps of smelting, adding nanoparticles and dispersing, cooling, twisting and deforming, asynchronous rolling and the like.

Description

Technical field [0001] The invention relates to a high-strength high-plasticity magnesium-aluminum alloy and a preparation method thereof, in particular to a high-performance magnesium-aluminum alloy reinforced with silicon carbide and a preparation method thereof. Background technique [0002] Magnesium-aluminum alloy is a metal material with a very low density, which has been used in handheld electronic devices, automobiles, aerospace and other fields. As engineering materials, people usually expect high-strength materials. However, due to the atomic structure of magnesium-aluminum alloys and its poor plasticity, traditional processing methods cannot obtain high-strength magnesium-aluminum alloys. [0003] Chinese Patent 104674080A discloses a magnesium-aluminum alloy and a preparation method thereof. The alloy material includes Ag 0.4wt%-0.8wt%, Co 0.6wt%-1.1wt%, Sn 1.2wt%-1.8wt%, In 0.5wt%-1.2wt%, Mn is 0.6wt%-1.1wt%, Pd is 0.2wt%-0.6wt%, Mg is 12wt%-24wt%, and the balance is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C23/02C22C1/10C22C21/06C22F1/06C22F1/047
CPCC22C1/02C22C1/026C22C1/1036C22C21/06C22C23/02C22F1/047C22F1/06C22C1/1047
Inventor 何枇林李德辉朱浩
Owner 南通众福新材料科技有限公司
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