Magnesium-zincium-manganese based magnesium alloy containing cerium

Abstract

The invention relates to a Magnesium-Zinc-Manganese alloy containing Cerium. The components of Magnesium alloy have the following mass percentage: 1.8 to 4.0 percent of Zinc, 0.5 to 1.5 percent of Manganese, 0.15 to 0.80 percent of Cerium and less than or equal to 0.15 percent of inevitable impurities and the remaining part is Magnesium. The Magnesium alloy of the invention has the advantages of the good hot-workability, the rapid extrusion deformation, obtaining fine crystal grain after many times of thermoplastic deformation, greatly promoting plasticity and keeping strength, achieving the tensile strength in room temperature to 285 Megapascal and the elongation to 20 percent.

Description

technical field [0001] The present invention relates to a magnesium alloy material, in particular to a cerium-containing magnesium-zinc-manganese system that can be rapidly extruded and deformed, and the refined effect is accumulated through multiple thermal deformations, and the obtained product has medium strength and high plasticity at room temperature magnesium alloy. Background technique [0002] With the application of magnesium alloy profile products in the fields of aerospace, electronic appliances, and automobiles, the shortcomings of insufficient plastic deformation capacity of magnesium alloy profiles have become an obstacle restricting its further expansion of application. The crystal close-packed hexagonal structure of magnesium alloy has less slip system in the deformation process, and the hot-working plasticity and product room temperature plasticity are obviously worse than aluminum alloy. [0003] As far as hot extrusion production is concerned, the poor ho...

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Problems solved by technology

[0005] Refining the grains by hot deformation is the most important method to improve the plasticity of the product while maintaining the strength. However, the refinement of the alloy structure during the hot deformation process has a limit value affected by the process conditions. When the grains are refined to a certain extent, further It is difficult to further refine the deformation by increasing the degree of deformation of a single thermal deformation or using repeated thermal deformation. The existing typical deformed magnesium alloys, such as: AZ31, AZ61, AZ80 and ZK60, etc., including the above-mentioned ZM21, can be heated at high speed. For deformed alloys, under conventional hot extrusion equipment and process conditions, the grain size of the product can only be controlled within the range of 15-35μm, and its room temperature tensile elongation is between 10% and 18%.

This is because in the above-mentioned magnesium alloys, there is a lack of alloy phases that do not melt at high temperatures to strengthen the matrix. For example, the strengthening phases in AZ61 and AZ31 alloys are only Mg 17 Al 12 , the stability becomes poor at high temperatures above 400°C, and it will dissolve during extrusion, and cannot maintain sufficient pinning to prevent grain growth (Yuan Guangyin, Sun Yangshan, Zhang Weimin Bi on the microstructure and mechanical properties of cast magnesium alloys , "Casting" No. 5, 1998, pages 5-7), which makes the mechanical properties of the extruded products lower

Therefore, in order to keep the higher mechanical properties of the extruded product, the extrusion speed of the above-mentioned magnesium alloy cannot be greater than 10m / min, and the production cost will be increased due to the slow extrusion speed.

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