TY - JOUR

T1 - Hot deformation mechanisms in AZ31 Magnesium Alloy Extruded at different temperatures

T2 - Impact of Texture

AU - Rao, Kamineni Pitcheswara

AU - Prasad, Yellapregada Venkata Rama Krishna

AU - Dzwonczyk, Joanna

AU - Hort, Norbert

AU - Kainer, Karl Ulrich

PY - 2012/9/1

Y1 - 2012/9/1

N2 - The hot deformation characteristics of AZ31 magnesium alloy rod extruded at temperatures of 300 °C, 350 °C and 450 °C have been studied in compression. The extruded material had a fiber texture with < 10 1 0 > parallel to the extrusion axis. When extruded at 450 °C, the texture was less intense and the < 10 1 0 > direction moved away from the extrusion axis. The processing maps for the material extruded at 300 °C and 350 °C 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 °C 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 < 10 1 0 > fiber texture with extrusion temperature. Highly intense < 10 1 0 > texture, as in the rod extruded at 350 °C, will enhance the occurrence of prismatic slip in domains #1 and #2 and promotes pyramidal slip at temperatures >450 °C (domain #3).

AB - The hot deformation characteristics of AZ31 magnesium alloy rod extruded at temperatures of 300 °C, 350 °C and 450 °C have been studied in compression. The extruded material had a fiber texture with < 10 1 0 > parallel to the extrusion axis. When extruded at 450 °C, the texture was less intense and the < 10 1 0 > direction moved away from the extrusion axis. The processing maps for the material extruded at 300 °C and 350 °C 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 °C 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 < 10 1 0 > fiber texture with extrusion temperature. Highly intense < 10 1 0 > texture, as in the rod extruded at 350 °C, will enhance the occurrence of prismatic slip in domains #1 and #2 and promotes pyramidal slip at temperatures >450 °C (domain #3).

KW - AZ31 magnesium alloy

KW - Extrusion temperature

KW - Fiber texture

KW - Kinetic analysis

KW - Processing maps

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=84969388177&partnerID=8YFLogxK

U2 - 10.3390/met2030292

DO - 10.3390/met2030292

M3 - Journal articles

AN - SCOPUS:84969388177

VL - 2

SP - 292

EP - 312

JO - Metals

JF - Metals

SN - 2075-4701

IS - 3

ER -