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Metals 2012, 2(3), 292-312; doi:10.3390/met2030292
Article

Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture

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Received: 25 June 2012; in revised form: 27 July 2012 / Accepted: 6 August 2012 / Published: 23 August 2012
(This article belongs to the Special Issue Magnesium Technology)
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Abstract: 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 parallel to the extrusion axis. When extruded at 450 °C, the texture was less intense and the 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 fiber texture with extrusion temperature. Highly intense 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).
Keywords: AZ31 magnesium alloy; extrusion temperature; fiber texture; processing maps; kinetic analysis AZ31 magnesium alloy; extrusion temperature; fiber texture; processing maps; kinetic analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Rao, K.P.; Prasad, Y.V.R.K.; Dzwonczyk, J.; Hort, N.; Kainer, K.U. Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture. Metals 2012, 2, 292-312.

AMA Style

Rao KP, Prasad YVRK, Dzwonczyk J, Hort N, Kainer KU. Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture. Metals. 2012; 2(3):292-312.

Chicago/Turabian Style

Rao, Kamineni Pitcheswara; Prasad, Yellapregada Venkata Rama Krishna; Dzwonczyk, Joanna; Hort, Norbert; Kainer, Karl Ulrich. 2012. "Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture." Metals 2, no. 3: 292-312.


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