Microstructure and Mechanical Properties of Severely Deformed Al-3Mg and its Evolution during Subsequent Annealing Treatment

  1. Prof. Dr. Michael Zehetbauer2 and
  2. Prof. Ruslan Z. Valiev3
  1. M.A. Morris-Muñoz,
  2. C. Garcia Oca,
  3. G. Gonzalez Doncel and
  4. D.G. Morris

Published Online: 28 JAN 2005

DOI: 10.1002/3527602461.ch11d

Nanomaterials by Severe Plastic Deformation

Nanomaterials by Severe Plastic Deformation

How to Cite

Morris-Muñoz, M.A., Garcia Oca, C., Gonzalez Doncel, G. and Morris, D.G. (2004) Microstructure and Mechanical Properties of Severely Deformed Al-3Mg and its Evolution during Subsequent Annealing Treatment, 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.ch11d

Editor Information

  1. 2

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

  2. 3

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

Author Information

  1. CENIM, CSIC, Madrid, Spain

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;
  • mechanical properties;
  • severely deformed Al-3Mg;
  • equal channel angular pressing (ECAP);
  • annealing treatment;
  • grain boundary misorientation;
  • converging beam electron diffraction;
  • recrystallization;
  • dislocation recovery;
  • transverse grain boundaries

Summary

During the intense deformation of Al-3Mg alloy by ECAP, an elongated grain/subgrain/ cellular structure is set up of width about 100 nm and length close to the micron. Analysis of grain boundary misorientations by converging beam electron diffraction shows that many of the boundaries are of very low angle. On annealing these materials, processes of dislocation recovery, of grain growth, and also of recrystallization occur. During the early stages of annealing, dislocation recovery into transverse grain boundaries can lead to some refinement of the microstructure. Recrystallization at higher temperatures can lead to a duplex microstructure, of recrystallized and unrecrystallized regions, depending on the initial level of strain and the annealing treatments given. Other studies are examining changes of texture during processing and annealing, and also the role of the various structural features on mechanical behaviour. Mechanical properties have been measured. It has been found difficult to interpret the strengthening occurring because of the variety of boundaries present (low-angle to high-angle) and their different contributions to material strength.