High-strength heat-resistant rare earth magnesium alloy and preparation method thereof

A rare earth magnesium and magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of alloy cost increase, consumption, and more rare earths

Active Publication Date: 2018-11-13
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 s

Method used

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  • High-strength heat-resistant rare earth magnesium alloy and preparation method thereof
  • High-strength heat-resistant rare earth magnesium alloy and preparation method thereof
  • High-strength heat-resistant rare earth magnesium alloy and preparation method thereof

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. The high-strength heat-resistant rare earth magnesium alloy comprises 2-6 wt% of Sm, 0-3 wt% of Nd, 2-5 wt% of heavy rare earth elements, 0.5-4 wt% of Zn, 0.2-3 wt% of Zr, and the balance Mg and inevitable impurities. According to the high-strength heat-resistant rare earth magnesium alloy, the influence of elementssuch as Sm and the heavy rare earth on an electron migration state of the Zr element is utilized, so that Zr in a Zr-rich ring is separated out on a pyramidal surface of a magnesium alloy matrix in aZn-Zr heat-resistant compound form in a heat treatment process. In a high-temperature condition, a Zn-Zr phase can effectively inhibit a non-basal plane slip, a Mg-RE precipitated phase is formed through the heat treatment on the basis, and meanwhile, the magnesium alloy matrix is reinforced. The two phases in the magnesium alloy provided by the invention can effectively inhibit a high-temperatureprismatic slip, a pyramidal slip and a basal slip, and the high-temperature strength of the magnesium alloy is improved. The invention further 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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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
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