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Journal of Materials Science

, Volume 43, Issue 23–24, pp 7372–7378 | Cite as

Enhanced superplasticity of magnesium alloy AZ31 obtained through equal-channel angular pressing with back-pressure

  • R. LapovokEmail author
  • Y. Estrin
  • M. V. Popov
  • S. Rundell
  • T. Williams
Ultrafine-Grained Materials

Abstract

Excellent superplastic elongations (in excess of 1,200%) were achieved in a commercial cast AZ31 alloy processed by low temperature equal-channel angular pressing (ECAP) with a back-pressure to produce a bimodal grain structure. In contrast, AZ31 alloy processed by ECAP at temperatures higher than 200 °C showed a reasonably uniform grain structure and relatively low ductility. It is suggested that a bimodal grain structure is advantageous because the larger grains contribute to strain hardening thus delaying the onset of necking, while grain boundary sliding associated with small grains provides a stabilizing effect due to enhanced strain rate sensitivity.

Keywords

Magnesium Alloy Solution Heat Treatment Tensile Ductility Magnesium Alloy AZ31 Superplastic Behaviour 

Notes

Acknowledgements

This work was supported by the Australian Research Council through Linkage International Grant no. LX0668485. The authors would like to express their gratitude to Professor T.G. Langdon for useful discussions.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • R. Lapovok
    • 1
    Email author
  • Y. Estrin
    • 1
    • 2
  • M. V. Popov
    • 3
  • S. Rundell
    • 1
  • T. Williams
    • 4
  1. 1.ARC Centre of Excellence for Design in Light Metals, Department of Materials EngineeringMonash UniversityClaytonAustralia
  2. 2. CSIRO Division of Materials Science and EngineeringClaytonAustralia
  3. 3.IWW, TU ClausthalClausthal-ZellerfeldGermany
  4. 4.Monash Centre for Electron MicroscopyMonash UniversityClaytonAustralia

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