Study On Structure Property And Process Of New Extrusion Formed AZ31 Magnesium Alloy

Magnesium is the lightest commercial construction metals being used in practice at present. At the same time, magnesium alloys have lower density, the highest strength to weigh ratio, good thermal conductivity , electrical conductivity, damping capacity, and good electromagnetic interference shielding property, the property of being easy to manufacture and recyclable. But magnesium alloy has a hexagonal close-packed (hcp) crystal structure with limited number of operative slip systems at room temperature, so magnesium alloys are normally low formability near the room temperature, and limits the expansion of magnesium alloy applications. However, up to date the research of wrought magnesium alloys mainly focused on the extrusion and rolling. The topics will be integrated with the deformation characteristics of the magnesium alloy, AZ31 magnesium alloy at different temperatures under the hot extrusion experiment Magnesium alloy found to the different temperature deformation mechanism.The extrusion ratio of this experiment are 4 and 4.5. Extrusion temperature are 250℃, 300℃, 350℃, 400℃, 450℃. After investigating the microstructure of different finished products, the result of microhardness test, and the result of compression test. these results followed: (1)There are some fine grains and streamline structure in finished products; (2)Slipping is the mainly deformation manner under extrusion. (3)Dynamic recrystallization occurred during the process of extrusion. Extrusion temperature has an significant influence on the microstructures, When the temperature increase, the size of recrystallization grain rises. (4)After extrusion, the finished products have higher microhardness and better mechanical behaviour, and its compression strength is higher than the compression strength of traditional extrusion bar. at the same time, the compressibility doesn't fall. The investigation shows that the special extrusion have theirs advantage. In the future research, will be allowed to optimize the mold parameter and the technological parameter, will extrude a performance finer finished product.