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High-modulus magnesium alloy and preparation method thereof

A magnesium alloy, high modulus technology, applied in the field of metal materials, can solve the problems of unsatisfactory engineering fields and low elastic modulus of magnesium alloys, and achieve good mechanical properties, high modulus, and large-scale industrial application.

Active Publication Date: 2019-01-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a high modulus magnesium alloy and its preparation method to solve the problem that the existing magnesium alloy has a low elastic modulus and cannot meet the needs of the engineering field

Method used

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  • High-modulus magnesium alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The magnesium alloy used included the following components in weight percentage: 15.5 wt.%Y, 1.8 wt.%Ni, 6 wt.%Al, 4wt.%Li, 0.4 wt.%Zr, the balance being Mg and unavoidable Impurities, the total amount of impurities is less than 0.12 wt.%.

[0026] 1) Use industrial pure magnesium ingots, pure nickel blocks, pure aluminum sheets, pure lithium, Mg-30%Y master alloys, and Mg-30%Zr master alloys as raw materials to calculate the ingredients; Vacuum melting in the electromagnetic induction furnace, the vacuum degree is 1.8~1.9×10 -2 KPa, first keep warm at 5KW for 2min, then rise to 15KW and keep warm for 10min, after it is completely melted, place it in brine to cool down to get magnesium alloy ingot;

[0027] 2) Put the as-cast Mg-Y-Ni-Al-Li-Zr magnesium alloy in a heat treatment furnace for high-temperature homogenization treatment at a heating rate of 15~20°C / min, heat to 500°C, and keep it for 12 hours. The ingot is water-cooled to room temperature;

[0028] 3) Mach...

Embodiment 2

[0031] The magnesium alloy used includes the following components in weight percentage: 8 wt.%Y, 6 wt.%Al, 4 wt.%Li, 0.4 wt.%Zr, the balance is Mg and unavoidable impurities, the total amount of impurities Less than 0.12 wt.%.

[0032] 1) Use industrial pure magnesium ingots, pure nickel blocks, pure aluminum sheets, pure lithium, Mg-30%Y master alloys, and Mg-30%Zr master alloys as raw materials to calculate the ingredients; Vacuum melting in the electromagnetic induction furnace, the vacuum degree is 1.8~1.9×10 -2 KPa, first keep warm at 5KW for 2min, then rise to 15KW and keep warm for 10min, after it is completely melted, place it in brine to cool down to get magnesium alloy ingot;

[0033] 2) Put the as-cast Mg-Y-Ni-Al-Li-Zr magnesium alloy in a heat treatment furnace for high-temperature homogenization treatment at a heating rate of 15~20°C / min, heat to 500°C, and keep it for 12 hours. The ingot is water-cooled to room temperature;

[0034] 3) Machining the magnesium ...

Embodiment 3

[0037] The magnesium alloy used includes the following components in weight percentage: 12.0 wt.%Gd, 1.0 wt.%Zn, 0.5 wt.%Zr, 0.5 wt.%Ag, 4 wt.%Al, 3 wt.%Li, and The amount is Mg and unavoidable impurities, the total amount of impurities is less than 0.12 wt.%.

[0038] 1) Calculate the ingredients with industrial pure magnesium ingots, pure aluminum flakes, pure zinc, pure silver, pure lithium, Mg-30% Gd master alloy, and Mg-30% Zr master alloy; Vacuum smelting in an electromagnetic induction furnace with gas protection, the vacuum degree is 1.8~1.9×10 -2 KPa, first keep warm at 6KW for 2 minutes, then rise to 15KW and keep warm for 10 minutes, after it is completely melted, place it in salt water to cool down to obtain a magnesium alloy ingot;

[0039] 2) Put the as-cast Mg-Gd-Al-Li-Ag-Zr-Zn magnesium alloy in a heat treatment furnace for high-temperature homogenization treatment at a heating rate of 15~20°C / min, heat to 520°C, and hold for 14 hours to complete Finally, the i...

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Abstract

The invention discloses a high-modulus magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by weight: 0-19.5wt% of Y, 0-13wt% of Gd,0-2wt% of Zn, 0-3.0wt% of Ni, 4-6wt% of Al, 3-6wt% of Li, 0.3-0.6wt% of Zr, 0-2wt% of Ag, and the balance of Mg and inevitable impurities, wherein the total amount of the impurities is less than 0.12wt%. In the alloy system, aluminum and lithium e added to generate an equilibrium precipitated phase AlLi during solidification, which can greatly increase the elastic modulus of the alloy; in addition to the phase, zirconium reacts with aluminum to generate an Al3Zr phase, and rare earth elements Y and Gd generate a large amount of second phase in the alloy, which all increase the elastic modulus of the alloy to some extent. In addition, after solid solution aging, more precipitated phase AlLi isprecipitated in the alloy to further increase the elastic modulus of the alloy, and the elastic modulus is up to 52-55 Gpa, which can meet the requirements of the engineering field for lightweight high-modulus magnesium alloy materials. The high-modulus magnesium alloy has a good application prospect in the aerospace field.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a high-modulus magnesium alloy and a preparation method thereof. Background technique [0002] In recent years, the development of high-modulus high-performance alloys has become a major research hotspot as the new generation of aerospace materials has higher and higher requirements for component stiffness. Magnesium alloy is currently the lightest metal structural material in application. It has the advantages of low density, high specific strength and specific stiffness, and is widely used in aerospace, electronics, automobiles, communications and other fields. However, due to the low elastic modulus of magnesium alloys (only 40~45GPa), it has poor elastic deformation resistance in engineering applications and cannot meet the demand for lightweight and high-modulus magnesium alloy materials in the engineering field, which greatly hinders the development of magnesium alloys. Furt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C23/02C22C23/00C22F1/06C22C1/03
CPCC22C1/03C22C23/00C22C23/02C22C23/06C22F1/06
Inventor 陈先华赵娣涂腾潘复生
Owner CHONGQING UNIV
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