Multi-element microalloyed 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 rare earth magnesium alloy materials, can solve problems such as difficulty in meeting the needs of precision manufacturing, deterioration of alloy process performance, and impact on the scope of application, achieve excellent room temperature and high temperature mechanical properties, and improve the microstructure. appearance, improve the effect of grain refinement

Active Publication Date: 2021-05-11
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

However, this system alloy mainly relies on the Orwan mechanism strengthening of precipitated phases to hinder dislocation movement, which significantly reduces the plasticity of the alloy, and is difficult to meet the processing performance requirements of precision manufacturing and the use requirements of aviation, rail transportation and other fields, and further increases in this type of alloy. Rare earth content will deteriorate the process performance of the alloy, increase the cost of use, affect the scope of application, and have low modification potential

Method used

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  • Multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof
  • Multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof
  • Multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof

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preparation example Construction

[0110] The present invention provides a casting molding preparation method of the rare earth magnesium alloy described in the above technical solution or any one of the above technical solutions, that is, the preparation method of the cast rare earth magnesium alloy, comprising the following steps:

[0111] 1) Melting Mg, Ag, Zn, Mg-RE master alloy and then heating up, adding Mg-Zr master alloy and Mg-Sc master alloy for refining to obtain a melt;

[0112] 2) cooling the molten matter obtained in the above steps, leaving it to stand, and then casting to obtain a magnesium alloy ingot;

[0113] 3) Perform solution treatment on the magnesium alloy ingot obtained in the above steps, and then perform aging treatment to obtain a rare earth magnesium alloy.

[0114] The present invention can correspond to the composition, category and addition ratio of the raw materials required in the above-mentioned preparation process, as well as the corresponding optimization principles, and the...

Embodiment 1

[0171] The high-strength heat-resistant magnesium alloy in this example is composed of the following components by mass percentage: Gd: 8.5wt.%, Y: 2.5wt.%, Ag: 0.5wt.%, Sc: 0.01wt.%, Zr: 0.45wt.%. %, Zn: 0.2wt.%, the balance is Mg and unavoidable impurities.

[0172] The casting molding preparation of the high-strength heat-resistant magnesium alloy of this embodiment comprises the following steps:

[0173] (1) Magnesium alloy ingot preparation: mix pure Mg, pure Ag, pure Zn, Mg-Zr master alloy, Mg-Sc master alloy, Mg-RE (20~30wt.%) master alloy according to the above-mentioned rated mass percentage, Wash and dry, preheat.

[0174] (2) Put pure Mg, pure Ag, pure Zn, Mg-RE (20 ~ 30wt.%) into the crucible to melt and heat up to 740 ° C, then add Mg-Zr master alloy, Mg-Sc master alloy to stir and refining.

[0175] (3) Cool the melt down to 710° C. and stand still for about 40 minutes, and then perform casting.

[0176] (4) Solution treatment: heat-treat the casting at 520°C...

Embodiment 2

[0184] The difference between Example 2 and Example 1 is that the high-strength heat-resistant magnesium alloy consists of the following components by mass percentage: Gd: 9.5wt.%, Y: 3wt.%, Ag: 0.7wt.%, Sc: 0.04wt .%, Zr: 0.45wt.%, Zn: 0.2wt.%, the balance is Mg and unavoidable impurities. Solution treatment: heat-treat the casting at 510°C for 12h, then air-cool to room temperature. Aging treatment: heat-treat the casting at 225°C for 48 hours, then air-cool to room temperature.

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Abstract

The invention provides a rare earth magnesium alloy. The rare earth magnesium alloy is a modified Mg-Gd-Y-Zr series rare earth magnesium alloy. The as-cast metallographic structure of the rare earth magnesium alloy is provided with an Mg5Gd phase with a round edge; and or the extruded metallographic structure of the rare earth magnesium alloy has a small granular precipitated phase, and the radial size of the granules is 10-150 nm. The microstructure morphology of the alloy is improved through a multi-element microalloying method, the microstructure morphology of the alloy material is improved by adding trace Ag and Sc in a specific proportion, the age hardening and grain refinement effects are improved, and then excellent room-temperature and high-temperature mechanical properties are obtained. On the premise that the total amount of rare earth is not increased, the strength performance index is high, good plasticity is reserved, engineering application is easy to achieve, and the requirements of the current fields of aerospace, missile military industry, rail transit and the like for the mechanical property of a light structural material under the room-temperature and high-temperature environment can be met.

Description

technical field [0001] The invention belongs to the technical field of rare earth magnesium alloy materials, and relates to a rare earth magnesium alloy and a preparation method thereof, in particular to a multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Among the currently commonly used metal structural materials, the density of magnesium is the smallest, and the density of pure magnesium is 1.74g / cm 3 , compared to aluminum (2.7g / cm 3 ) and iron (7.87g / cm 3 ) are 1 / 3 and 3 / 4 lighter, respectively, and are the lightest metal among practical metals. They have the characteristics of high specific strength and high specific stiffness, and have good application prospects in industries that urgently need weight reduction. Magnesium alloy is an alloy based on magnesium and other elements, and it is also the lightest metal structure material in engineering applications. Its characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06
Inventor 邱鑫田政孙伟杨强孟健
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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