Hot deformation mechanisms in AZ31 Magnesium Alloy Extruded at different temperatures: Impact of Texture

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

  • Kamineni Pitcheswara Rao
  • Yellapregada Venkata Rama Krishna Prasad
  • Joanna Dzwonczyk
  • Norbert Hort
  • Karl Ulrich Kainer

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).

Original languageEnglish
JournalMetals
Volume2
Issue number3
Pages (from-to)292-312
Number of pages21
ISSN2075-4701
DOIs
Publication statusPublished - 01.09.2012
Externally publishedYes

    Research areas

  • AZ31 magnesium alloy, Extrusion temperature, Fiber texture, Kinetic analysis, Processing maps
  • Engineering

DOI

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