Magnesium alloy with high strength and ductility and high electromagnetic shielding performance and thermo-mechanical treatment method thereof

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 for introducing cylindrical precipitation phase, cylindrical dislocation and basal plane precipitation phase, matrix precipitation into magnesium alloy through low temperature deformation heat treatment The surface dislocations form a honeycomb-like internal microstructure, thereby preparing a magnesium alloy with high strength, toughness and high electromagnetic shielding, which belongs to the technical field of non-ferrous metal materials and processing. Background technique [0002] With the progress of science and technology and the continuous development of the information age, various electronic and electrical equipment bring convenience to people's daily life, while the accompanying electromagnetic radiation will inevitably become a new pollution, causing...

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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

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