Metallurgical Transactions A

, Volume 23, Issue 11, pp 3135–3140 | Cite as

Interaction of high-temperature deformation mechanisms

  • M. G. Zelin
  • H. S. Yang
  • R. Z. Valiev
  • A. K. Mukherjee
Mechanical Behavior


High-temperature tensile tests have been conducted on a magnesium alloy (Mg-1.5 pct Mn-0.3 pct Ce) with randomly mixed fine and coarse grains. The microstructural examinations clearly show that different mechanisms operate in the regions of coarse and fine grains. The coarse grains deform by dislocation slip, while grain boundary sliding occurs in the fine grains. The influence of these mechanisms on each other has also been observed in terms of dislocation density, intragranular slip lines, and grain boundary sliding. The analytical equations describing the interaction of two deformation mechanisms operative in materials with regions of fine and coarse grains were derived. The analysis is applicable for determining the controlling mechanism of two interacting mechanisms. It is predicted that at a critical volume fraction of fine grains of approximately 40 pct, a transition from superplastic to nonsuperplastic behavior occurs.


Metallurgical Transaction Magnesium Alloy Deformation Mechanism Dislocation Slip Transmission Electron Microscope Photograph 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    K.A. Padmanabhan and G.J. Davis:Superplasticity, Springer- Verlag, Berlin, 1980.Google Scholar
  2. 2.
    J. Pilling and N. Ridley:Superplasticity in Crystalline Solids, The Institute of Metals, London, 1989.Google Scholar
  3. 3.
    O.D. Sherby and J. Wadsworth:Prog. Mater. Sci., 1989, vol. 33, p. 169.CrossRefGoogle Scholar
  4. 4.
    A.K. Ghosh and R. Raj:Acta Metall., 1986, vol. 36, p. 447.Google Scholar
  5. 5.
    J. Cadek: Creep in Metallic Materials, Elsevier, 1988.Google Scholar
  6. 6.
    J.P. Poirier:Creep of Crystals, Cambridge University Press, Cambridge, United Kingdom, 1985.Google Scholar
  7. 7.
    O.A. Kaibyshev:Superplasticity of Commercial Alloys, Metallurgia, Moscow, 1984 (in Russian).Google Scholar
  8. 8.
    R.Z. Valiev, V.Yu. Gertcman, and O.A. Kaibyshev:Met. Phys. Metallogr., 1983, vol. 55, p. 554, (in Russian).Google Scholar
  9. 9.
    R.Z. Valiev and O.A. Kaibyshev:Phys. Status Solidi A, 1977, vol. 44, p. 65.CrossRefGoogle Scholar
  10. 10.
    B.C. Snyder, J. Wadsworth, and O.D. Sherby:Acta Metall., 1984, vol. 32, p. 919.CrossRefGoogle Scholar
  11. 11.
    R.C. Gifkins:J. Mater. Sci., 1970, vol. 5, p. 156.CrossRefGoogle Scholar
  12. 12.
    T.G. Langdon and F.A. Mohamed:J. Austra. Inst. Met., 1977, vol. 22, p. 189.Google Scholar
  13. 13.
    L. Onsager:Phys. Rev., 1931, vol. 37, p. 405.CrossRefGoogle Scholar
  14. 14.
    L. Onsager:Phys. Rev., 1931, vol. 38, p. 2265.CrossRefGoogle Scholar
  15. 15.
    J.P. Hirth and J. Lothe:Theory of Dislocations, McGraw-Hill Book Company, New York, NY, 1968.Google Scholar
  16. 16.
    M.G. Zelin and R.Z. Valiev: Ufa Aviation Institute, Ufa, Russia, unpublished research, 1991.Google Scholar
  17. 17.
    N.G. Zaripov, A.R. Vagapov, and O.A. Kaibyshev:Met. Phys. Metallogr., 1987, vol. 63, p. 774.Google Scholar

Copyright information

© The Minerals, Metals and Materials Society, and ASM International 1992

Authors and Affiliations

  • M. G. Zelin
    • 1
  • H. S. Yang
    • 1
  • R. Z. Valiev
    • 1
  • A. K. Mukherjee
    • 2
  1. 1.Department of Mechanical, Aeronautical and Materials EngineeringUniversity of California-DavisDavis
  2. 2.Ufa Aviation InstituteUfaRussia

Personalised recommendations