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Heat treatment method for regulating and controlling microstructure of magnesium-gadolinium alloy

A heat treatment method and microstructure technology, which is applied in the field of heat treatment to regulate the microstructure of alloys, can solve the problems of decreased elongation, low high-temperature mechanical properties of magnesium alloys, and increased alloy strength, so as to achieve improved mechanical properties and excellent room temperature/high temperature mechanics. performance effect

Active Publication Date: 2022-03-08
BEIJING UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The present invention aims at the disadvantages that the high-temperature mechanical properties of magnesium alloys are generally not high at present, and provides a heat treatment technology suitable for Mg-Gd-Er-Zn-Zr alloys, which can realize the regulation and control of different types of second phases in the alloys. The technical parameters such as temperature and holding time can obtain the ideal second phase structure in the same alloy, and realize the improvement of the mechanical properties of the alloy material at room temperature / high temperature. Insufficient strength increases and elongation decreases, a high-temperature aging precipitation technology and different types of precipitation strengthening phases are obtained, which are very beneficial to improving the room temperature / high temperature mechanical properties of the alloy and expanding the application range of magnesium alloys

Method used

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  • Heat treatment method for regulating and controlling microstructure of magnesium-gadolinium alloy
  • Heat treatment method for regulating and controlling microstructure of magnesium-gadolinium alloy
  • Heat treatment method for regulating and controlling microstructure of magnesium-gadolinium alloy

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Embodiment 1

[0027] Keep the Mg-15Gd-5Er-5Zn-0.5Zr alloy at 550°C for 100h, then air-cool for 30min, then put it into the furnace for the second heat preservation treatment, the heat preservation temperature is 525°C, the heat preservation time is 90h, and then air-cooled After 30 minutes, a large number of long rod-shaped phases were formed in the alloy. The strength of the alloy at room temperature was 450 MPa, and the elongation was 25%. At 350°C, the strength was 260 MPa, and the elongation was 35%.

Embodiment 2

[0029] The Mg-15Gd-5Er-5Zn-0.2Zr alloy was kept at 550°C for 36h, then air-cooled for 10min, and then put into the furnace for the second heat preservation treatment. The heat preservation temperature was 525°C, the heat preservation time was 26h, and then air-cooled 10min, then carry out the third heat preservation treatment, the heat preservation temperature is 510 ℃, the heat preservation time is 20h, there are a large amount of long rod-shaped phases to form in the alloy (see figure 1 Shown), the strength of the alloy at room temperature is 420MPa, the elongation is 21%, at 350 ℃ its strength is 270MPa, the elongation is 15%.

Embodiment 3

[0031] Keep the Mg-12Gd-1Er-1Zn-0.3Zr alloy at 500°C for 10h, then air-cool for 10min, then put it into the furnace for the second heat preservation treatment, the heat preservation temperature is 475°C, the heat preservation time is 5h, and then air-cooled After 10 minutes, the alloy contains a large number of long rod-shaped phases. The strength of the alloy at room temperature is 400MPa, and the elongation is 18%. At 250°C, the strength is 220MPa, and the elongation is 23%.

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Abstract

A heat treatment method for regulating and controlling the microstructure of a magnesium-gadolinium alloy belongs to the technical field of heat treatment, and the alloy comprises the following components by weight percent: 6-15% of Gd, 0-5% of Zn, 0-5% of Er, 0.1-0.6% of Zr, 0.03-0.85% of Zn / RE (Gd, Er) and the balance of magnesium. And alternate circulating cold and heat treatment of furnace temperature heat preservation and air cooling keeping is carried out for multiple times. The alloy treated by the technology has excellent room-temperature / high-temperature mechanical properties, and can be used in a plurality of advanced technical fields with higher requirements on alloy products.

Description

technical field [0001] The invention relates to a heat treatment method for adjusting and controlling the microstructure of an alloy. The alloy treated by the technology has excellent room temperature / high temperature mechanical properties, and can be used in many cutting-edge technical fields with high requirements for alloy products. Background technique [0002] At present, magnesium alloy is the third type of metal structure material with the lowest density among metal structure materials developed after steel and aluminum alloy, and is called the green engineering material of the 21st century. Moreover, my country is rich in magnesium resources, the reserves of magnesium minerals rank first in the world, and the output of metal magnesium ranks first in the world. The country pays more and more attention to the use of magnesium and magnesium alloy products. Magnesium alloys are used in the field of industrial products, which can not only reduce the weight of equipment, b...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22C23/06
CPCC22F1/06C22F1/002C22C23/06
Inventor 刘轲胡大龙杜文博李淑波于子健杜宪
Owner BEIJING UNIV OF TECH
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