High-strength magnesium alloy and preparation method thereof

Abstract

The present invention relates to a high intensity magnesium alloy and the preparation method. Magnesium, aluminum, zinc and neodymium are adopted as raw materials, which are melted in a melting furnace, under the protection of the mixed gases, and are melted down at the temperature of 720 plus or minus 10 degrees Celsius system, magnesium- neodymium alloy is added at the temperature of 780 plus or minus 10 degrees Celsius system, refined and the heat is preserved at the temperature of 740 plus or minus 10 degrees Celsius system and then the magnesium-aluminum-zinc-neodymium melt is obtained. When the temperature is lowered to 680-700 degrees Celsius system, the magnesium-aluminum-zinc-neodymium melt is discharged and cut into shapes after being moulded and cooled and then made into high intensity aluminum-magnesium alloy ingots after an 8-channel equal channel rotor angle pinch. The raw material mixture ratio of magnesium, aluminum, zinc and neodymium is 82 to 15 to 2 to 1 and aluminum makes up 15 percent. The aluminum material is abundant in resource, low in price and more economical and the lanthanon neodymium can change the metallurgical structure and mechanical property. The method has a short process flow and a slight pollution to the environment. The tensile strength, yield strength and elongation of the magnesium alloy ingots can be increased by 147.4 percent, 210.6 percent and 448.3 percent respectively. The metallurgical structure is compact and even and the average crystal grain size is less than or equal to 2 micrometers.

Description

technical field [0001] The invention relates to a high-strength magnesium alloy and a preparation method thereof, belonging to the technical field of preparation and application of nonferrous metal magnesium alloys. Background technique [0002] Magnesium alloy is the lightest metal material. It has the advantages of low density, high specific strength and specific stiffness, good thermal and electrical conductivity, damping and vibration reduction, electromagnetic shielding, easy processing and molding, and easy recycling of waste materials. It is used in automobiles, electronic communications, and aerospace. It has important application value in the fields of national defense and military affairs. [0003] Magnesium alloys also have their disadvantages in performance, such as wide crystallization temperature intervals, easy to form solidification shrinkage distribution in the casting section, reducing the strength and toughness of the alloy, magnesium alloy has a close-pac...

AI Technical Summary

Problems solved by technology

[0007] In order to take advantage of the advantages of aluminum elements and overcome the defects of aluminum elements, some use die-casting, hot rolling, and forging methods to improve the mechanical properties of magnesium-aluminum alloys, but the results are very low, and the strength of magnesium-aluminum alloys cannot be greatly improved. Toughness, corrosion resistance, so that the application of magnesium alloy in industry has been greatly limited

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