Equal-channel angular pressing method of iron-covered magnesium

Abstract

The invention relates to an equal-channel angular pressing method of iron-covered magnesium. The method aims to solve the problems that magnesium is low in strength and poor in plastic forming performance. An iron-covered magnesium combination is manufactured by the adoption of a copper mould suction casting method. Equal-channel angular pressing is carried out at the room temperature of 25 DEG C, annealing is carried out at a moderate temperature, and magnesium grain structures are refined. The manufacturing process is advanced in method, data are detailed and accurate, the iron-covered magnesium combination is organically combined, magnesium grains are refined to 200nm, compactness is good, the application range of magnesium is widened, and the method is an ideal method for room-temperature severe plastic deformation of the magnesium.

Description

technical field [0001] The invention relates to an iron-clad magnesium equal-channel angular extrusion method, which belongs to the technical field of non-ferrous metal reinforced preparation and application. Background technique [0002] Magnesium is one of the lightest non-ferrous metals. Due to its low density, easy processing, high specific strength and specific stiffness, good thermal conductivity, damping and shock absorption, and electromagnetic shielding, it is often used in automotive, electronics, aerospace, and military fields. , but due to the disadvantages of low strength and poor plastic forming of magnesium, the scope of application of magnesium is limited. [0003] Grain refinement is an effective way to improve the mechanical properties of magnesium, for example, adding grain refiners to magnesium, such as composite rare earth materials, zinc, calcium, strontium, etc. Grain refinement is a more effective and commonly used method; because magnesium has a clo...

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Problems solved by technology

[0002] Magnesium is one of the lightest non-ferrous metals. Due to its low density, easy processing, high specific strength and specific stiffness, good thermal conductivity, damping and shock absorption, and electromagnetic shielding, it is often used in automotive, electronics, aerospace, and military fields. , but due to the disadvantages of low strength and poor plastic forming of magnesium, the scope of application of magnesium is limited

[0003] Grain refinement is an effective way to improve the mechanical properties of magnesium, for example, adding grain refiners to magnesium, such as composite rare earth materials, zinc, calcium, strontium, etc. Grain refinement is a more effective and commonly used method; because magnesium has a close-packed hexagonal structure, poor crystal symmetry, less slip systems, low room temperature ductility of magnesium, and difficult plastic processing, therefore, the existing magnesium Processing deformation is generally carried out at a temperature of 300 ° C ~ 600 ° C; because magnesium is prone to dynamic recrystallization at high temperatures, the grain refinement effect of magnesium is significantly reduced, and it is difficult to achieve the use requirements of high-performance magnesium by thermal processing deformation methods; therefore, How to realize the large plastic deformation of magnesium at room temperature of 25°C has become a technical problem in the development and application of high-performance magnesium

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