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The isothermal extrusion and the microstructure evolution after extrusion of AZ31 and AZ91 magnesium

MA Wen-chang

Abstract

The extrusion property and microstructure evolution of AZ31 and AZ91 magnesium alloy under different deformation conditions were studied in isothermal extrusion process and through metallographic examination.The results show that the forming quality of AZ31 magnesium alloy is better than AZ91 magnesium alloy.For AZ91,the cracks would appear on the specimen surface at extrusion ratio 4∶1,extrusion temperature 400℃,and at extrusion ratio 9∶1,extrusion temperature 350℃ and 400℃.The best forming temperature for AZ31 is 300℃～400℃,for AZ91 is 300℃～350℃.Dynamic recrystallization occurred in the hot extrusion process of the magnesium alloy,the grain of extruded samples were significantly refined.

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Key concepts: Extrusion, Magnesium alloy, Microstructure, Materials science, Metallurgy, Dynamic recrystallization, Isothermal process, Magnesium