Microstructure Refinement and Improvement of Mechanical Properties of a Magnesium Alloy by Severe Plastic Deformation

  1. Prof. Dr. Michael Zehetbauer3 and
  2. Prof. Ruslan Z. Valiev4
  1. A. Mussi1,2,
  2. J.J. Blandin1,2 and
  3. E. F. Rauch1,2

Published Online: 28 JAN 2005

DOI: 10.1002/3527602461.ch13g

Nanomaterials by Severe Plastic Deformation

Nanomaterials by Severe Plastic Deformation

How to Cite

Mussi, A., Blandin, J.J. and Rauch, E. F. (2004) Microstructure Refinement and Improvement of Mechanical Properties of a Magnesium Alloy by Severe Plastic Deformation, in Nanomaterials by Severe Plastic Deformation (eds M. Zehetbauer and R. Z. Valiev), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527602461.ch13g

Editor Information

  1. 3

    Institut für Materialphysik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria

  2. 4

    Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marks Str., Ufa, 450 000, Russia

Author Information

  1. 1

    Génie Physique et Mécanique des Matériaux (GPM2) Saint-Martin d'Hères, France

  2. 2

    Institut National Polytechnique de Grenoble (INPG) Saint-Martin d'Hères, France

Publication History

  1. Published Online: 28 JAN 2005
  2. Published Print: 25 FEB 2004

ISBN Information

Print ISBN: 9783527306596

Online ISBN: 9783527602469

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Keywords:

  • microstructure refinement;
  • magnesium alloy;
  • severe plastic deformation (SPD);
  • equal channel angular extrusions (ECAE);
  • AZ91;
  • superplasticity

Summary

Equal channel angular extrusions (ECAE) have been performed on a magnesium alloy (AZ91) to improve its mechanical properties at room and high temperature. Two conditions of extrusions have been selected: at constant and varying temperature. In both cases, the structure is drastically refined and cells of about 0.3 µm could be achieved. These microstructures exhibit high yield stresses at room temperature and superplastic properties at lower temperatures than those usually reported for magnesium alloys. A specificity of this alloy is the ability to contain a large amount of β phase (Al12Mg17). A particular attention is given to the role of this intermetallic phase during both the ECAE process and the superplastic deformation. Moreover, the effect of deformation (ECAE, superplasticity) on the β precipitation is also discussed.