%0 Journal Article
%T Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture
%A Kamineni Pitcheswara Rao
%A Yellapregada Venkata Rama Krishna Prasad
%A Joanna Dzwonczyk
%A Norbert Hort
%A Karl Ulrich Kainer
%J Metals
%D 2012
%I MDPI AG
%R 10.3390/met2030292
%X The hot deformation characteristics of AZ31 magnesium alloy rod extruded at temperatures of 300 ˇăC, 350 ˇăC and 450 ˇăC have been studied in compression. The extruded material had a fiber texture withŁżparallel to the extrusion axis. When extruded at 450 ˇăC, the texture was less intense and the direction moved away from the extrusion axis. The processing maps for the material extruded at 300 ˇăC and 350 ˇăC are qualitatively similar to the material with near-random texture (cast-homogenized) and exhibited three dynamic recrystallization (DRX) domains. In domains #1 and #2, prismatic slip is the dominant process and DRX is controlled by lattice self-diffusion and grain boundary self-diffusion, respectively. In domain #3, pyramidal slip occurs extensively and DRX is controlled by cross-slip on pyramidal slip systems. The material extruded at 450 ˇăC exhibited two domains similar to #1 and #2 above, which moved to higher temperatures, but domain #3 is absent. The results are interpreted in terms of the changes in fiber texture with extrusion temperature. Highly intenseŁżtexture, as in the rod extruded at 350 ˇăC, will enhance the occurrence of prismatic slip in domains #1 and #2 and promotes pyramidal slip at temperatures >450 ˇăC (domain #3).
%K AZ31 magnesium alloy
%K extrusion temperature
%K fiber texture
%K processing maps
%K kinetic analysis
%U http://www.mdpi.com/2075-4701/2/3/292