Physical Fields Evolution and Microstructures
for Compound Extrusion of AZ31 Magnesium Alloy¹

H-J Hu¹, J-Z Fan¹, Z-Y Zhai¹, H Wang¹, Y-Y Li¹, and X-B Gong²

¹ College of Materials Science and Engineering, Chongqing University of Technology, 400050 China
² Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487

Abstract—To research physical fields evolution and microstructures for compound extrusion of AZ31 Alloy,
A kind of compound extrusion technology including extrusion and following shears for AZ31 magnesium bil-
lets have been explored. Three-dimensional finite element simulations of extruding AZ31 magnesium alloy bil-
lets into small rods at certain ram speed have been performed by compound extrusion with extrusion ratio 28
and channel angle 150. Parameters including workpiece material characteristics and process conditions have
been taken into consideration. High cumulative strains and low temperatures rise was the main reason for grain
refinement during compound process. The observation results of microstructures and rod surface quality
showed that the compound process effectively refine the grains of AZ31 magnesium and product magnesium
alloy rods.

Keywords: Magnesium alloys, compound extrusion, finite element modeling, Strain evolution, temperature field

DOI: 10.3103/S1067821214030067

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