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Acta Metallurgica Sinica (English Letters)

, Volume 31, Issue 1, pp 71–81 | Cite as

Deformation Mechanism and Hot Workability of Extruded Magnesium Alloy AZ31

  • Zhao-Yang JinEmail author
  • Nan-Nan Li
  • Kai Yan
  • Jian Wang
  • Jing Bai
  • Hongbiao Dong
Article

Abstract

Using the flow stress curves obtained by Gleeble thermo-mechanical testing, the processing map of extruded magnesium alloy AZ31 was established to analyze the hot workability. Stress exponent and activation energy were calculated to characterize the deformation mechanism. Then, the effects of hot deformation parameters on deformation mechanism, microstructure evolution and hot workability of AZ31 alloy were discussed. With increasing deformation temperature, the operation of non-basal slip systems and full development of dynamic recrystallization (DRX) contribute to effective improvement in hot workability of AZ31 alloy. The influences of strain rate and strain are complex. When temperature exceeds 350 °C, the deformation mechanism is slightly dependent of the strain rate or strain. The dominant mechanism is dislocation cross-slip, which favors DRX nucleation and grain growth and thus leads to good plasticity. At low temperature (below 350 °C), the deformation mechanism is sensitive to strain and strain rate. Both the dominant deformation mechanism and inadequate development of DRX deteriorate the ductility of AZ31 alloy. The flow instability mainly occurs in the vicinity of 250 °C and 1 s−1.

Keywords

Hot workability Deformation mechanism Dynamic recrystallization Activation energy Magnesium alloy 

Notes

Acknowledgements

This work was supported financially by the National Key Research and Development Program of China (No. 2016YFC1102402), the National Natural Science Foundation of China (No. 31570961) and the Natural Science Foundation of Jiangsu Province (No. BK20160968).

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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Zhao-Yang Jin
    • 1
    Email author
  • Nan-Nan Li
    • 1
  • Kai Yan
    • 1
  • Jian Wang
    • 2
  • Jing Bai
    • 3
  • Hongbiao Dong
    • 4
  1. 1.School of Mechanical EngineeringYangzhou UniversityYangzhouChina
  2. 2.School of Physics and Optoelectronic EngineeringNanjing University of Information Science and TechnologyNanjingChina
  3. 3.School of Materials Science and EngineeringSoutheast UniversityNanjingChina
  4. 4.Department of EngineeringUniversity of LeicesterLeicesterEngland

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