High-toughness cast magnesium-rare earth alloy and preparation method thereof

A magnesium rare earth alloy, high-strength technology, applied in the field of high strength and toughness cast magnesium rare earth alloy and its preparation, can solve the problems of restricting the application of cast magnesium alloys, improve room temperature strength and room temperature plasticity, increase the density of precipitated phases, and suppress crystal grains The effect of coarsening

Pending Publication Date: 2022-06-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lack of high-strength cast magnesium alloys has severely limited the application of cast magnesium alloys in high-end manufacturing

Method used

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  • High-toughness cast magnesium-rare earth alloy and preparation method thereof
  • High-toughness cast magnesium-rare earth alloy and preparation method thereof
  • High-toughness cast magnesium-rare earth alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The present embodiment relates to a high-strength and toughness cast magnesium rare-earth alloy. The components and mass percentages of the magnesium alloy are: 10.2wt.%Gd, 0.2wt.%Zn, 0.1wt.%La, 0.4wt.%Zr, The total content of impurity elements Si, Fe, Cu and Ni is less than 0.2wt.%, and the balance is Mg (wt.% refers to the percentage of the components in the total mass of the prepared magnesium alloy, and the total mass is Mg, Zn and various the quality of the master alloy and).

[0039] This embodiment relates to the preparation method of the above-mentioned high-strength and toughness cast magnesium rare earth alloy, wherein the melting and casting process is performed in the SF 6 and CO 2 Under mixed gas protection conditions, the steps are as follows:

[0040] (1) Baking material: Preheat pure magnesium, pure zinc, Mg-Gd, Mg-La, Mg-Zr master alloy at 200°C for more than 3 hours.

[0041] (2) molten magnesium: put the pure magnesium after drying into SF 6 / CO 2...

Embodiment 2

[0048] This embodiment relates to a high-strength and toughness cast magnesium rare-earth alloy. The components and mass percentages of the magnesium alloy are: 10.2wt.%Gd, 0.2wt.%Zn, 0.2wt.%La, 0.4wt.%Zr, The total content of impurity elements Si, Fe, Cu and Ni is less than 0.2wt.%, and the balance is Mg (wt.% refers to the percentage of the components in the total mass of the prepared magnesium alloy, and the total mass is Mg, Zn and various the quality of the master alloy and).

[0049] This embodiment relates to the preparation method of the above-mentioned high-strength and toughness cast magnesium rare earth alloy, wherein the melting and casting process is performed in the SF 6 and CO 2 Under mixed gas protection conditions, the steps are as follows:

[0050] (1) Baking material: Preheat pure magnesium, pure zinc, Mg-Gd, Mg-La, Mg-Zr master alloy at 200°C for more than 3 hours.

[0051] (2) molten magnesium: put the pure magnesium after drying into SF 6 / CO 2 Melti...

Embodiment 3

[0058] The present embodiment relates to a high-strength and toughness cast magnesium rare-earth alloy. The components and mass percentages of the magnesium alloy are: 10.2wt.%Gd, 0.2wt.%Zn, 0.4wt.%La, 0.4wt.%Zr, The total content of impurity elements Si, Fe, Cu and Ni is less than 0.2wt.%, and the balance is Mg (wt.% refers to the percentage of the components in the total mass of the prepared magnesium alloy, and the total mass is Mg, Zn and various the quality of the master alloy and).

[0059] This embodiment relates to the preparation method of the above-mentioned high-strength and toughness cast magnesium rare earth alloy, wherein the melting and casting process is performed in the SF 6 and CO 2 Under mixed gas protection conditions, the steps are as follows:

[0060] (1) Baking material: Preheat pure magnesium, pure zinc, Mg-Gd, Mg-La, Mg-Zr master alloy at 200°C for more than 3 hours.

[0061] (2) molten magnesium: put the pure magnesium after drying into SF 6 / CO ...

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Abstract

The invention discloses a high-toughness cast magnesium rare earth alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 9.4-10.8% of Gd, 0.1-0.4% of Zn, 0.1-0.4% of La, 0.3-0.7% of Zr, less than 0.2 wt.% of impurity elements Si, Fe, Cu and Ni, and the balance of Mg. The preparation method comprises the working procedures of material drying, magnesium melting, alloy element adding, refining, casting forming, heat treatment and the like. Through La element microalloying and subsequent heat treatment process optimization, the strength and plasticity of the cast magnesium-rare earth alloy are remarkably improved, and the high-strength and high-toughness cast magnesium-rare earth alloy with higher strength and better plasticity is obtained; the design and development of the alloy can powerfully promote the application of the cast magnesium-rare earth alloy in the field of high-end manufacturing.

Description

technical field [0001] The invention relates to a high-strength and toughness cast magnesium rare-earth alloy and a preparation method thereof, belonging to the technical field of metal structural materials. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of high specific strength, specific stiffness, and good shock absorption, and is widely used in aerospace, rail transit, 3C fields, etc. Due to its good room temperature strength and casting properties, the Mg-Gd system has been used in the aerospace field in recent years. . Although Mg-Gd cast magnesium alloys have high strength, their room temperature plasticity is low, which makes it difficult to meet the high requirements for strong plasticity in the aerospace field. The elongation is only 2.0%; the standard tensile strength of VQ132Z cast magnesium rare earth alloy is 350MPa, the yield strength is 240MPa, and the elongation is only 1.0%. How to design and d...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06C22F1/002
Inventor 付彭怀林金铭王迎新彭立明丁文江
Owner SHANGHAI JIAO TONG UNIV
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