Ultra Fine Grained Copper Prepared by High Pressure Torsion: Spatial Distribution of Defects from Positron Annihilation Spectroscopy

  1. Prof. Dr. Michael Zehetbauer4 and
  2. Prof. Ruslan Z. Valiev5
  1. J. Cizek1,
  2. I. Prochazka1,
  3. G. Brauer2,
  4. W. Anwand2,
  5. R. Kuzel1,
  6. M. Cieslar1 and
  7. R. K. Islamgaliev3

Published Online: 28 JAN 2005

DOI: 10.1002/3527602461.ch7b

Nanomaterials by Severe Plastic Deformation

Nanomaterials by Severe Plastic Deformation

How to Cite

Cizek, J., Prochazka, I., Brauer, G., Anwand, W., Kuzel, R., Cieslar, M. and Islamgaliev, R. K. (2004) Ultra Fine Grained Copper Prepared by High Pressure Torsion: Spatial Distribution of Defects from Positron Annihilation Spectroscopy, 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.ch7b

Editor Information

  1. 4

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

  2. 5

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

Author Information

  1. 1

    Charles University in Prague, Faculty of Mathematics and Physics, Prague, Czech Republic

  2. 2

    Institut für Ionenstrahlphysik und Materialforschung, Forschungszentrum Rossendorf, Dresden, Germany

  3. 3

    Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, Russia

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:

  • ultra fine grained copper;
  • spatial distribution of defects;
  • positron annihilation spectroscopy;
  • high-pressure torsion (HPT);
  • equal channel angular pressing (ECAP);
  • severe plastic deformation (SPD);
  • ultra fine-grained materials;
  • UFG

Summary

High-pressure torsion (HPT) and equal channel angular pressing (ECAP) are techniques based on severe plastic deformation (SPD). They are used to produce relatively large amounts of ultra fine-grained (UFG) materials without any porosity [1]. HPT-made metallic UFG specimens are typically disk shaped with a diameter of ≈ 10 mm and a thickness of ≈ 0.3 mm. In an ideal case, the specimens would exhibit axial symmetry of UFG structure. In real case, however, some deviations from axial symmetry of UFG structure may be expected. In addition, radial as well as depth variations of grain size and/or defect density may result from unequal degrees of plastic deformation during the preparation of specimens. In the ECAP technique, ingots of a diameter given by channel cross-section are produced. The shear deformation during ECAP pressing is the same along the whole ingot. It means that, contrary to the HPT-made specimens, variations of defect density and grain size with depth are not expected.