Microstructure Evolution of AS41 Magnesium Alloy in ECAP

Abstract:

ECAP is a continuous multi-pass extrusion process that enables the specimen to obtain considerable cumulative deformation to refine the grain. In this paper, ECAP was used to deform AS41 magnesium alloy at 350°C, and the microstructure was observed and analyzed. The results show that the ECAP process has excellent effect on grain refinement and uniform microstructure. The grain size of AS41 decreases from 200μm to 20μm, and the microstructure is more uniform than that of as-cast sample. The reason is that the original grain is broken and refined under the action of shear force, and dynamic recrystallization occurs at the same time, resulting in small recrystallized grains. The Mg₂Si particles were redistributed during ECAP and uniformly distributed in the crystal in rod shape.

• Periodical: Key Engineering Materials (Volume 904)
• Pages: 65-69
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.904.65
• Online since: November 2021
• Authors: Zong Li Pi, Xiao Feng Zhang, Zhang Ling, Ying Long Li*
• Keywords: AS41 Magnesium Alloy, Dynamic Recrystallization, Equal Channel Angular Pressing

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