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A kind of high-strength heat-resistant rare earth magnesium alloy and its preparation method

A rare earth magnesium and magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of increased alloy cost, multiple rare earths, consumption, etc.

Active Publication Date: 2020-05-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology can effectively pin basal slip through rare earth precipitates, if you want to pin non-basal slip at high temperature, you need to consume more rare earths to form basal precipitates, which increases the cost of the alloy

Method used

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  • A kind of high-strength heat-resistant rare earth magnesium alloy and its preparation method
  • A kind of high-strength heat-resistant rare earth magnesium alloy and its preparation method
  • A kind of high-strength heat-resistant rare earth magnesium alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] According to the preset composition: Sm2wt%, Gd2wt%, Zn 0.5wt%, Zr 0.5wt%, the balance is Mg and unavoidable impurities, the synthetic composition, Mg source, Zn source, Sm source, Gd source and Zr During the batching process, the oxide skin on the surface of each raw material is removed, and they are preheated to 200°C;

[0090] Preheat the crucible to 500°C, add the above preheated Mg source, raise the furnace temperature to 720°C, and inject SF with a volume ratio of 1:100 6 and CO 6 The mixed gas is used for magnesium smelting;

[0091] After the Mg source is completely melted, a Mg alloy liquid is obtained; adding the above-mentioned preheated Sm source, Zn source and Gd source to the Mg alloy liquid, stirring evenly for 10 minutes for smelting, to obtain a mixed liquid;

[0092] Raise the temperature of the furnace to 760°C, add the above-mentioned preheated Zr source to the mixed liquid, stir evenly for 10 minutes for smelting, and obtain the alloy liquid;

[...

Embodiment 2

[0101] According to the preset composition: Sm3wt%, Gd3wt%, Zn 1.5wt%, Zr 1.5wt%, the balance is Mg and unavoidable impurities, the synthetic composition, Mg source, Zn source, Sm source, Gd source and Zr During the batching process, the scale on the surface of each raw material is removed, and they are preheated to 300°C;

[0102] Preheat the crucible to 500°C, add the above preheated Mg source, raise the furnace temperature to 730°C, and inject SF with a volume ratio of 1:100 6 and CO 6 The mixed gas is used for magnesium smelting;

[0103] After the Mg source is completely melted, a Mg alloy liquid is obtained; adding the above-mentioned preheated Sm source, Zn source and Gd source to the Mg alloy liquid, stirring evenly for 5 minutes for smelting, to obtain a mixed liquid;

[0104] Raise the furnace temperature to 770°C, add the above-mentioned preheated Zr source to the mixed liquid, stir evenly for 5 minutes for smelting, and obtain the alloy liquid;

[0105] Lower th...

Embodiment 3

[0113] According to the preset composition: Sm 5wt%, Y 3wt%, Zn 2wt%, Zr 1.5wt%, the balance is Mg and unavoidable impurities, the synthetic composition, Mg source, Zn source, Sm source, Y source and The Zr source is used for batching. During the batching process, the scale on the surface of each raw material is removed, and they are preheated to 300°C;

[0114] Preheat the crucible to 500°C, add the above preheated Mg source, raise the furnace temperature to 760°C, and inject SF with a volume ratio of 1:100 6 and CO 6 The mixed gas is used for magnesium smelting;

[0115] After the Mg source is completely melted, a Mg alloy liquid is obtained; adding the above-mentioned preheated Sm source, Zn source and Y source to the Mg alloy liquid, stirring evenly for 15 minutes for smelting, to obtain a mixed liquid;

[0116] Raise the temperature of the furnace to 770°C, add the above-mentioned preheated Zr source to the mixed liquid, stir evenly for 15 minutes for smelting, and obta...

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Abstract

The invention provides a high-strength heat-resistant rare earth magnesium alloy, which is composed of: 2-6wt% of Sm; 0-3wt% of Nd; 2-5wt% of heavy rare earth elements; 0.5-4wt% of Zn; 0.2-3wt% Zr; the balance is Mg and unavoidable impurities. The present invention utilizes the influence of Sm, heavy rare earth and other elements on the electronic shift state of Zr element, so that Zr in the Zr-rich ring is precipitated on the cone surface of the magnesium alloy matrix in the form of Zn-Zr heat-resistant compound during heat treatment. Under high temperature conditions, the Zn-Zr phase can effectively inhibit the non-basal slip, and on this basis, the Mg-RE precipitate phase is formed through heat treatment to strengthen the magnesium alloy matrix. The presence of two types of phases in the magnesium alloy of the invention can effectively inhibit high-temperature cylindrical slip, conical slip and basal slip, and improve the high-temperature strength of the magnesium alloy. The invention also provides a preparation method of the high-strength heat-resistant rare earth magnesium alloy.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a high-strength heat-resistant rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest metal structure material. It has a series of advantages such as high specific strength and specific stiffness, good vibration and noise reduction and electromagnetic shielding performance, strong resistance to dynamic impact loads, and rich resources, making it widely used in national economy and national defense construction. has great application prospects. Mg-Zn and Mg-Al traditional magnesium alloys have low high-temperature strength, and their current applications are mainly concentrated in non-load-bearing structural parts. With the development of weapons and equipment, the requirements for lightweight and strength are getting higher and higher. In major national projects and military fields such as large aircraf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/02C22F1/06
CPCC22C1/02C22C23/06C22F1/06
Inventor 张洪杰程丽任车朝杰佟立波孟健
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI