Grain refiner for magnesium alloy and preparation method thereof

Abstract

The invention discloses a grain refiner for magnesium alloy and a preparation method thereof. The grain refiner comprises the components in percentage by weight: 95 to 98 percent of Al, 2 to 5 percent of C and less than or equal to 0.2 percent of impurities. The preparation method comprises the following steps of: mixing aluminum powder, carbon powder, MgCO3 powder and a magnesium alloy NO.2 solvent uniformly by using a ball mill, drying to prepare preformed powder, preheating an intermediate frequency furnace, packing the preformed powder by using an aluminum foil, placing the pack in the intermediate frequency furnace, pouring aluminum solution to cover the preformed powder, and heating the reaction materials by applying an intermediate frequency magnetic field to make the aluminum solution form stable forced convection; and after keeping the temperature, casting the reaction materials into an ingot to prepare the grain refiner for the magnesium alloy. The method has the advantages of adequate reaction, high carbon yield, enlargement of production scale and suitability for industrial production.

Description

technical field [0001] The invention relates to a grain refiner and a preparation method thereof, in particular to a grain refiner for magnesium alloys and a preparation method thereof. Background technique [0002] Magnesium alloy is light in weight, high in specific strength and specific stiffness, and good in damping and vibration reduction. It is known as the "green" alloy in the 21st century; with the development goals of industrial lightweight and energy saving, it is widely used in automobiles, electronics, military and Applications in the aerospace industry are increasingly widespread. However, due to the close-packed hexagonal structure of magnesium alloys, magnesium alloys have low room temperature plasticity and low formability, which limits the popularization and application of deformed magnesium alloys. Grain refinement is currently an effective method to improve the mechanical properties and formability of subsequent processing of magnesium alloys (especially ...

AI Technical Summary

Problems solved by technology

However, the methods currently used are all research in the laboratory and are not suitable for industrial production.

One is that the reaction temperature is higher and the aluminum fire consumption is high; the other is that the added aluminum carbon powder is not uniform, if stirred, the carbon is easy to float, and the yield is low; if not stirred, the carbon distribution is uneven, and the yield is low. The third is that the microstructure stability of the prepared A-C alloy is low after the grain is refined, so it cannot be called to maintain the refining effect for a long time

More importantly, previous studies are only suitable for laboratory small batch preparation and cannot be used for industrial production

Self-propagating high-temperature synthesis and interfacial reaction generation methods require complex production conditions and high process requirements, and have not been widely used.

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