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Dynamic Recrystallization and Grain Refinement in Extruded AZ31 Rod During Hot Torsion Deformation at 150 °C

  • Hongbing Chen
  • Bo Song
  • Ning Guo
  • Tingting Liu
  • Tao Zhou
  • Jiejun He
Article
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Abstract

The dynamic recrystallization mechanism and microstructure evolution in an extruded AZ31 rod during hot torsion deformation at 150 °C were investigated. It indicated that several dynamic recrystallization mechanisms were initiated during hot torsion deformation, including discontinuous DRX (DDRX), continuous DRX (CDRX) and twinning induced DRX (TDRX). With increasing strain, CDRX became the dominant DRX mechanism and contributed to a remarkable refinement of grains. A gradient distribution of dynamic recrystallization grains on the cross section of samples generated due to the gradient shear strain in twisted samples. Hot torsion can also arouse the c-axis of grains to rotate towards the extrusion direction. From low strain to high strain, the recrystallized grains exhibited a similar texture development with the deformed grains. The relevant mechanisms were revealed.

Keywords

Magnesium alloys Hot torsion Dynamic recrystallization Texture 

Notes

Acknowledgements

This project was financially supported by the Fundamental Research Funds for the Central Universities (SWU117002), the National Natural Science Foundation of China (51601154 and 51501045) and Natural Science Foundation of Guizhou Province (Grant No. [2015] 2067).

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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  • Hongbing Chen
    • 1
  • Bo Song
    • 2
  • Ning Guo
    • 2
  • Tingting Liu
    • 2
  • Tao Zhou
    • 3
  • Jiejun He
    • 4
  1. 1.College of Engineering and TechnologySouthwest UniversityChongqingPeople’s Republic of China
  2. 2.Faculty of Materials and EnergySouthwest UniversityChongqingPeople’s Republic of China
  3. 3.College of Material Science and EngineeringChongqing University of TechnologyChongqingPeople’s Republic of China
  4. 4.School of Materials and Metallurgical EngineeringGuizhou Institute of TechnologyGuizhouPeople’s Republic of China

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