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A kind of 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 microstructure. appearance, improve the effect of grain refinement

Active Publication Date: 2022-07-15
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof
  • A kind of multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof
  • A kind of 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 method for preparing the rare earth magnesium alloy according to the above technical solution or the casting molding method of the rare earth magnesium alloy according to any one of the above technical solutions, that is, the preparation method of the as-cast rare earth magnesium alloy, comprising the following steps:

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

[0112] 2) the molten material obtained in the above steps is cooled and left to stand, and then cast to obtain a magnesium alloy ingot;

[0113] 3) subjecting the magnesium alloy ingot obtained in the above steps to a solution treatment and then to an 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 preparation process, as well as the co...

Embodiment 1

[0171] The high-strength and heat-resistant magnesium alloy of this embodiment 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: 0.2 wt.%, the balance is Mg and inevitable impurities.

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

[0173] (1) Preparation of magnesium alloy ingots: pure Mg, pure Ag, pure Zn, Mg-Zr master alloy, Mg-Sc master alloy, Mg-RE (20-30wt.%) master alloy are batched according to the above rated mass percentage, Wash, dry and preheat.

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

[0175] (3) The melt was cooled to 710° C. for about 40 minutes, followed by casting.

[0176] (4) Solution treatment: heat treatment at 520°C for ...

Embodiment 2

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

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Abstract

The invention provides a rare earth magnesium alloy, which is a modified Mg-Gd-Y-Zr rare earth magnesium alloy; the as-cast metallographic structure of the rare earth magnesium alloy has rounded edges Mg 5 Gd phase; or, the metallographic structure of the rare earth magnesium alloy in the extruded state has small particle-like precipitates; the radial size of the small particles is 10-150 nm. The invention improves the microstructure and morphology of the alloy through the method of multi-element microalloying, improves the microstructure and morphology of the alloy material by adding a specific proportion of trace Ag and Sc, and improves the effect of age hardening and grain refinement, thereby obtaining excellent room temperature and temperature. High temperature mechanical properties. On the premise of not increasing the total amount of rare earths, the present invention has high strength and performance indexes, retains good plasticity, is easy to realize engineering application, and can meet the requirements for lightweight structural materials in the current aerospace, missile military, rail transit and other fields. Requirements for mechanical properties at room temperature and high temperature.

Description

technical field [0001] The invention belongs to the technical field of rare earth magnesium alloy materials, relates to a rare earth magnesium alloy and a preparation method thereof, in particular to a multi-element microalloyed high strength and heat resistant rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Among the 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, which is the lightest metal among practical metals. It has the characteristics of high specific strength and high specific stiffness, and has a good application prospect in the industrial field where weight reduction is urgently needed. The magnesium alloy is an alloy composed of magnesium and other elements, and it is also the lightest metal structural material in engineering applications. I...

Claims

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Application Information

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Patent Type & Authority Patents(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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