Plastic Flow Properties and Microstructural Evolution in an Ultrafine-Grained Al-Mg-Si Alloy at Elevated Temperatures

  • B.P. Kashyap
  • P.D. Hodgson
  • Y. Estrin
  • I. Timokhina
  • M.R. Barnett
  • I. Sabirov
Article

Abstract

An AA6082 alloy was subjected to eight passes of equal channel angular pressing at 100 °C, resulting in an ultrafine grain size of 0.2 to 0.4 μm. The tensile deformation behavior of the material was studied over the temperature range of 100 °C to 350 °C and strain rate range of 10−4 to 10−1 s−1. The evolution of microstructure under tensile deformation was investigated by analyzing both the deformation relief on the specimen surface and the dislocation structure. While extensive microshear banding was found at the lower temperatures of 100 °C to 150 °C, deformation at higher temperatures was characterized by cooperative grain boundary sliding and the development of a bimodal microstructure. Dislocation glide was identified as the main deformation mechanism within coarse grains, whereas no dislocation activity was apparent in the ultrafine grains.

Notes

Acknowledgments

The authors acknowledge financial support from the Australian Research Council through the ARC Centre of Excellence for Design in Light Metals and the Federation Fellowship awarded to PH. IS and MB thank Deakin University for partial funding through the Central Research Grants Scheme. Assistance of Dr. Pavel Cizek with TEM work is acknowledged. Useful discussions with Professor David Embury are much appreciated.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2009

Authors and Affiliations

  • B.P. Kashyap
    • 1
  • P.D. Hodgson
    • 2
    • 3
  • Y. Estrin
    • 3
    • 4
    • 6
  • I. Timokhina
    • 2
  • M.R. Barnett
    • 2
    • 3
  • I. Sabirov
    • 5
  1. 1.Department of Metallurgical Engineering and Materials ScienceIIT BombayPowaiIndia
  2. 2.Centre for Material and Fibre Innovation, Institute of Technology Research and InnovationDeakin UniversityWaurn PondsAustralia
  3. 3.ARC Centre of Excellence for Design in Light Metals, Department of Materials EngineeringMonash UniversityClaytonAustralia
  4. 4.CSIRO Division of Materials Science and EngineeringClayton SouthAustralia
  5. 5.Instituto Madrileño de Estudios Avanzados de Materiales (IMDEA-Materiales)E.T.S. de Ingenieros de CaminosMadridSpain
  6. 6.Deakin UniversityWaurn PondsAustralia

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