A magnesium alloy with high strength, toughness and high electromagnetic shielding performance and its deformation heat treatment method

A deformation heat treatment and electromagnetic shielding technology, which is applied in the field of high strength, toughness and high electromagnetic shielding performance magnesium alloy and its deformation heat treatment, can solve the problems of incompatibility between strength and toughness and electromagnetic shielding performance, low strength, insufficient strength and toughness, etc., to achieve improvement Effects of electromagnetic shielding performance, increased reflective surface density, and lightweight price

Inactive Publication Date: 2021-04-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the magnesium alloys currently used in electromagnetic shielding, such as Mg-Al, Mg-Zn-Zr, Mg-Cu, Mg-Sn and other alloys, all have the disadvantages of insufficient strength and toughness or that the electromagnetic shielding performance still needs to be improved.
Among them, although Mg-Al and Mg-Zn-Zr alloys have good ductility, Mg-Al alloys have extremely low strength and Mg-Zn-Zr alloys have insufficient electromagnetic shielding performance; Mg-Cu alloys have high strength and low electromagnetic shielding performance. Excellent, but its toughness is usually poor; Mg-Sn alloy precipitates due to age strengthening are unstable, and its strength, toughness and electromagnetic shielding performance cannot be achieved at the same time

Method used

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  • A magnesium alloy with high strength, toughness and high electromagnetic shielding performance and its deformation heat treatment method

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Experimental program
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Effect test

Embodiment 1

[0023] The raw material is Mg-3Gd-0.6Ca-0.2Zn alloy (mass percentage), the Ca / Zn mass ratio is 3, and the plate with a thickness of 10 mm is obtained by semi-continuous casting and hot rolling. After solution treatment, it is carried out at 230 ° C. 72h of aging treatment and water quenching, followed by deformation at 80°C to a true strain of 0.03, and then 48h of aging treatment and water quenching at 190°C. The room temperature mechanical properties and electromagnetic shielding properties of the alloy were tested, and the results are shown in Table 1.

Embodiment 2

[0025] The raw material is Mg-6Gd-0.8Ca-0.1Zn alloy (mass percentage), the Ca / Zn mass ratio is 8, and the plate with a thickness of 20 mm is obtained by semi-continuous casting and hot extrusion. Aging treatment and water quenching were carried out for 60 hours, followed by deformation to a true strain of 0.07 at 60°C, followed by aging treatment and water quenching at 220°C for 24 hours. The room temperature mechanical properties and electromagnetic shielding properties of the alloy were tested, and the results are shown in Table 1.

Embodiment 3

[0027] The raw material is Mg-16Gd-0.2Ca-0.02Zn alloy (mass percentage), the Ca / Zn mass ratio is 10, and the plate with a thickness of 25 mm is obtained by semi-continuous casting and hot rolling. After solution treatment, it is carried out at 200 ° C 2h of aging treatment and water quenching, followed by deformation at room temperature to a true strain of 0.1, and then 1h of aging treatment and water quenching at 150°C. The room temperature mechanical properties and electromagnetic shielding properties of the alloy were tested, and the results are shown in Table 1.

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Abstract

The invention discloses magnesium alloy with high strength and ductility and high electromagnetic shielding performance and a thermo-mechanical treatment method thereof. The magnesium alloy comprises,by mass, 3%-16% of Gd, 0.2%-1% of Ca and 0.02%-0.2% of Zn, and the mass ratio of the Ca to the Zn is larger than or equal to 3; or the magnesium alloy comprises, by mass, 3%-16% of Gd, 0.2%-1% of Ca,0.2%-3% of Al and the balance Mg, and the mass ratio of the Ca to the Al is larger than or equal to 0.2. A magnesium alloy ingot blank can be prepared by means of semicontinuous casting, the ingot blank is hot-rolled or hot-extruded into boards with the thicknesses being 5-25mm, ageing and water quenching are carried out after solution treatment is completed, the boards are further truly stresseduntil deformation is 0.02-0.1, and then ageing and water quenching are performed. According to the magnesium alloy with high strength and ductility and high electromagnetic shielding performance andthe thermo-mechanical treatment method thereof, the alloy internally includes a cellular microstructure formed by cylindrical surface precipitated phases, cylindrical surface dislocation, base surfaceprecipitated phases and base surface dislocation together, the synchronous improvement effect on the mechanical property and electromagnetic shielding effects is remarkable, and the bottleneck that the high strength and ductility and high electromagnetic shielding performance of magnesium alloy cannot be compatibly achieved is broken through.

Description

technical field [0001] The invention relates to a magnesium alloy with high strength, toughness and high electromagnetic shielding performance and a deformation heat treatment method thereof, in particular to a method of introducing columnar precipitates, columnar dislocations, basal precipitates, and basal precipitates into magnesium alloys through low-temperature deformation heat treatment. Plane dislocation forms a honeycomb internal microstructure, thereby preparing a magnesium alloy with high strength and toughness and high electromagnetic shielding performance, which belongs to the field of non-ferrous metal materials and processing technology. Background technique [0002] With the advancement of science and technology and the continuous development of the information age, while various electronic and electrical equipment bring convenience to people's daily life, the accompanying electromagnetic radiation inevitably becomes new pollution, and the harm to the environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/002C22F1/06
Inventor 霍庆欢冯慧娟
Owner CENT SOUTH UNIV
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