A kind of high-strength and high-plastic magnesium alloy and preparation method thereof

A technology for strengthening magnesium alloys and magnesium alloys, applied in the field of high-strength and high-plastic magnesium alloys and their preparation, can solve problems such as low strength, and achieve the effects of increasing strength, refining grains, and increasing volume fraction

Inactive Publication Date: 2018-07-27
经卓新材料股份有限公司
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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 alloys, especially the strength performance. However, their yield strength is generally below 350MPa, which is far lower than the strength of current steel, titanium alloys, carbon fibers and other materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Prepare raw materials: prepare more than 99.9% high-purity magnesium and high-purity zinc, and nano-SiC with an average particle size of 110;

[0034] (2) Smelting alloy: mix high-purity magnesium and zinc according to the atomic ratio of 5:1, in CO 2 with SF 6 Melting in a mixed gas, where CO 2 with SF 6 The volume ratio is 100:1; during the smelting process, add nano-SiC accounting for 3.2% of the alloy mass fraction, keep the temperature at 700 ° C, and disperse by ultrasonic method;

[0035] (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 degree of 4torr;

[0036] (4) After cooling, the alloy ingot is processed into a disc shape;

[0037] (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 5GPa to the alloy, and rotate the anvil at a speed of 2 revolutions per minute Twist...

Embodiment 2

[0043] (1) Prepare raw materials: prepare more than 99.9% high-purity magnesium and high-purity zinc, and SiC with an average particle size of 80 nanometers;

[0044] (2) Smelting alloy: mix high-purity magnesium and zinc according to the atomic ratio of 4:1, in CO 2 with SF 6 Melting in a mixed gas, where CO 2 with SF 6 The volume ratio is 80:1; during the smelting process, add nano-SiC accounting for 5% of the alloy mass fraction, keep the temperature at 700 ° C, and disperse by ultrasonic method;

[0045] (3) Slowly cool the alloy ingot at a cooling rate of 0.4K per second; maintain a vacuum state during the cooling process with a vacuum degree of 5 torr;

[0046] (4) After cooling, the alloy ingot is processed into a disc shape;

[0047] (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 1.5GPa to the alloy, and rotate the press at a speed of 3 revolutions per minute. ...

Embodiment 3

[0053] (1) Prepare raw materials: prepare more than 99.9% high-purity magnesium and high-purity zinc, and SiC with an average particle size of 60 nanometers;

[0054] (2) Smelting alloy: mix high-purity magnesium and zinc according to the atomic ratio of 3.5:1, in CO 2 with SF 6 Melting in a mixed gas, where CO 2 with SF 6 The volume ratio is 50:1; during the smelting process, add nano-SiC accounting for 1.8% of the alloy mass fraction, keep the temperature at 700 ° C, and disperse by ultrasonic method;

[0055] (3) Slowly cool the alloy ingot at a cooling rate of 0.5K per second; maintain a vacuum state during the cooling process, and the vacuum degree is 3torr;

[0056] (4) After cooling, the alloy ingot is processed into a disc shape;

[0057] (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 1.5GPa to the alloy, and rotate the press at a speed of 2 revolutions per min...

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Abstract

A high-strength and high-plastic magnesium alloy and a preparation method thereof. The invention adopts the method of doping nano-silicon carbide into the magnesium alloy to obtain a high-strength magnesium alloy. The magnesium alloy is composed of magnesium, zinc and nano-silicon carbide; the atomic ratio of magnesium and zinc is between 3:1 and 1.5:1; the average diameter of silicon carbide is less than 200 nanometers, and the average grain size of magnesium alloy is less than 80 nanometers , The yield strength of the alloy can reach more than 450MPa, and the elongation is more than 40%. The magnesium alloy is prepared through the steps of smelting, adding nanoparticles and dispersing, cooling, twisting, asynchronous rolling and the like.

Description

technical field [0001] The invention relates to a high-strength and high-plastic magnesium alloy and a preparation method thereof, in particular to a silicon carbide-reinforced high-performance magnesium alloy and a preparation method thereof. Background technique [0002] With the continuous development of aerospace technology, it is required that the density of materials should be lower and lower while increasing the strength, so as to maximize the fuel combustion efficiency. Magnesium alloy is a metal material with very low density, and it has been used in handheld electronic devices, automobiles, aerospace and other fields. However, as an engineering material, the strength of magnesium alloy is still low. [0003] Chinese patent CN 103031452 A discloses a silicon carbide particle-reinforced magnesium-based composite material and its preparation method. The invention uses pure Mg powder, Al powder and SiC particle micropowder as raw materials to prepare silicon carbide p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C18/00C22C32/00C22C1/10C22F1/06C22F1/16
CPCC22C1/1036C22C18/00C22C23/04C22C32/0063C22F1/06C22F1/165C22C1/1047
Inventor 何枇林李德辉杨志轩
Owner 经卓新材料股份有限公司
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