Grain Refinement and Superplastic Properties of Cu-Zn Alloys Processed by Equal-Channel Angular Pressing

  1. Prof. Dr. Michael Zehetbauer3 and
  2. Prof. Ruslan Z. Valiev4
  1. Koji Neishi1,
  2. Zenji Horita1 and
  3. Terence G. Langdon2

Published Online: 28 JAN 2005

DOI: 10.1002/3527602461.ch13h

Nanomaterials by Severe Plastic Deformation

Nanomaterials by Severe Plastic Deformation

How to Cite

Neishi, K., Horita, Z. and Langdon, T. G. (2004) Grain Refinement and Superplastic Properties of Cu-Zn Alloys Processed by Equal-Channel Angular Pressing, 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.ch13h

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

    Kyushu University, Fukuoka, Japan

  2. 2

    University of Southern California, Los Angeles, U.S.A.

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:

  • grain refinement;
  • superplasticity;
  • Cu-Zn alloys;
  • equal-channel angular pressing (ECAP)

Summary

Two Cu-based alloys, containing either 40 wt% or 42 wt% Zn, were subjected to equal-channel angular pressing (ECAP) in order to achieve significant grain refinement. The alloys were annealed initially at 1123 K to give a single phase and subsequently at 633 K to give a two-phase structure. Grain refinement was achieved through a combination of severe plastic straining using ECAP and the phase transformation which occurs on passing from a single to a dual-phase structure. An ultrafine grain size was achieved after only one pass of ECAP and there was little or no grain coarsening even after annealing for 1 hour at 623 K. Tensile testing showed that the Cu-40 % Zn alloy was superplastic at a temperature of 623 K, corresponding to a homologous temperature of ∼0.53 Tm where Tm is the melting temperature of the alloy, and there was evidence for superplastic flow both at low temperatures and at reasonably high strain rates.