Hot deformation mechanisms in AZ31 Magnesium Alloy Extruded at different temperatures: Impact of Texture
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Hot deformation mechanisms in AZ31 Magnesium Alloy Extruded at different temperatures : Impact of Texture. / Rao, Kamineni Pitcheswara; Prasad, Yellapregada Venkata Rama Krishna; Dzwonczyk, Joanna et al.
In: Metals, Vol. 2, No. 3, 01.09.2012, p. 292-312.Research output: Journal contributions › Journal articles › Research › peer-review
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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 -