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Light-heavy rare-earth composite reinforced heat-resistant magnesium alloy and preparation method thereof

A technology of light and heavy rare earth and magnesium alloy, which is applied in the field of light and heavy rare earth composite strengthening heat-resistant magnesium alloy and its preparation, can solve the problems of poor high temperature mechanical properties of magnesium alloy, achieve good thermal stability, refine grains, and improve plasticity. Effect

Inactive Publication Date: 2019-04-16
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

[0005] In view of this, the present invention solves the technical problem of relatively poor high-temperature mechanical properties of magnesium alloys in the prior art, improves the thermal properties, mechanical properties and stability of rare earth magnesium alloys, and provides a light-heavy rare earth composite strengthened heat-resistant magnesium alloy and its preparation method

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  • Light-heavy rare-earth composite reinforced heat-resistant magnesium alloy and preparation method thereof
  • Light-heavy rare-earth composite reinforced heat-resistant magnesium alloy and preparation method thereof
  • Light-heavy rare-earth composite reinforced heat-resistant magnesium alloy and preparation method thereof

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preparation example Construction

[0046] The preparation method of the light and heavy rare earth compound reinforced heat-resistant magnesium alloy of the present invention, the steps are as follows:

[0047] Step 1, melting magnesium source, zinc source, gadolinium source, cerium source and zirconium source to obtain alloy liquid;

[0048] Step 2, cooling the alloy liquid and pouring it into a mold to obtain a casting;

[0049] Step 3: extruding the casting to obtain light and heavy rare earth compound strengthened heat-resistant magnesium alloy.

[0050] In the present invention, the types and sources of magnesium sources, zinc sources, gadolinium sources, cerium sources and zirconium sources are not particularly limited, and magnesium sources, zinc sources, gadolinium sources, cerium sources and zirconium sources well known to those skilled in the art can be used. Usually, the source of magnesium is magnesium ingots, preferably pure magnesium ingots containing more than 99.9 wt% of magnesium; the source o...

Embodiment 1

[0082] Light-heavy rare earth compound strengthened heat-resistant magnesium alloy, the composition is: Gd 8.0wt%, Ce 0.5wt%, Zn 1.2wt%, Zr0.5wt%, the balance is Mg and unavoidable impurity elements.

[0083] The preparation of the above-mentioned light and heavy rare earth composite strengthened heat-resistant magnesium alloy:

[0084] Step 1, magnesium ingot, zinc ingot, gadolinium source (magnesium-gadolinium master alloy ingot containing 20% ​​gadolinium), cerium source (magnesium-cerium master alloy ingot containing 20% ​​cerium) and zirconium source (magnesium-zirconium master alloy ingot containing 30% zirconium) Intermediate alloy ingot) to remove the oxide layer, prepare the material according to the proportion, and then preheat it to 250°C.

[0085] Step 2. When the crucible is heated to 550°C, add magnesium ingots under the condition of feeding protective gas. After the magnesium ingots are melted, raise the temperature to 730°C, add zinc ingots, gadolinium sources ...

Embodiment 2

[0093] Light-heavy rare earth compound strengthened heat-resistant magnesium alloy, the composition is: Gd 8.5wt%, Ce 1wt%, Zn 1.2wt%, Zr0.5wt%, the balance is Mg and unavoidable impurity elements.

[0094] Preparation of Light and Heavy Rare Earth Composite Strengthened Heat-resistant Magnesium Alloy:

[0095] Step 1, magnesium ingot, zinc ingot, gadolinium source (magnesium-gadolinium master alloy ingot containing 20% ​​gadolinium), cerium source (magnesium-cerium master alloy ingot containing 20% ​​cerium) and zirconium source (magnesium-zirconium master alloy ingot containing 30% zirconium) Intermediate alloy ingot) to remove the oxide layer, prepare the material according to the proportion, and then preheat it to 250°C.

[0096]Step 2. When the crucible is heated to 545°C, add magnesium ingots under the condition of feeding protective gas, wait for the magnesium ingots to melt, raise the temperature to 740°C, add zinc ingots, gadolinium sources and cerium sources, and aft...

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Abstract

The invention relates to a light-heavy rare-earth composite reinforced heat-resistant magnesium alloy and a preparation method thereof, and belongs to the technical field of non-ferrous metal materials and processing thereof. The light-heavy rare-earth composite reinforced heat-resistant magnesium alloy solves the technical problem that the high-temperature mechanical property of a magnesium alloyin the prior art is poor, and improves the thermal performance, the mechanical property and the stability of the rare-earth magnesium alloy. The magnesium alloy disclosed by the invention comprises the following components of 7.0-9.0wt% of Gd, greater than 0% and less than or equal to 1.5wt% of Ce, 1-1.5wt% of Zn, 0.4-0.6wt% of Zr and the balance Mg and inevitable impurity elements. The magnesiumalloy has high strength and excellent heat resistance, after being detected, and the performance can reach the following standards that at a room temperature of 25 DEG C, the tensile strength is 395MPa, the yield strength is 366 MPa, and the elongation percentage is 9.5%, at 200 DEG C, the tensile strength is 365 MPa, the yield strength is 328 MPa, and the elongation percentage is 7.5%, and at 250 DEG C, the tensile strength is 354 MPa, the yield strength is 322 MPa, and the elongation percentage is 10.5%.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal materials and processing thereof, and in particular relates to a light-heavy rare-earth composite strengthened heat-resistant magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloys have the advantages of low density, high specific strength, and good recyclability, and are favored in many aspects such as lightweight, energy saving, and environmental protection. Based on the classification of forming process, magnesium alloy parts are mainly divided into two categories: die casting and deformation processing. Magnesium alloy die-casting has the advantages of low cost and high productivity, so it is widely used in the fields of automobiles, construction and electronics. It should be pointed out that although die-casting magnesium alloys can meet the strength requirements, the room temperature plasticity of die-casting magnesium alloys is very low. ...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/02C22C1/03C22F1/06
CPCC22C23/06C22C1/02C22C1/03C22F1/06
Inventor 孟健李柏顺张栋栋管凯杨强孙伟牛晓东邱鑫田政
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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