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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

1,* , 2
,
3
,
4
 and
4
1 Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China 2 Processingmaps.com, No. 2/B, Hospital Extension, Vinayak Nagar, Bangalore 560075, India 3 Lightweight Metallic Materials, SKF Engineering & Research Centre, Utrecht Area, Netherlands 4 Magnesium Innovation Centre, Helhmoltz Zentrum Geesthacht, Max-Planck-Straße 1, Geesthacht 21502, Germany
* Author to whom correspondence should be addressed.
Received: 25 June 2012 / Revised: 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 (CC BY 3.0).
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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.

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