Metallurgical Transactions A

, Volume 22, Issue 4, pp 829–836

Processing map for hot working of alpha-zirconium

  • J. K. Chakravartty
  • Y. V. R. K. Prasad
  • M. K. Asundi
Mechanical Behavior


The hot deformation characteristics of alpha-zirconium in the temperature range of 650 °C to 850 °C and in the strain-rate range of 10-3 to 102 s-1 are studied with the help of a power dissipation map developed on the basis of the Dynamic Materials Model.[7,8,9] The processing map describes the variation of the efficiency of power dissipation (η =2m/m + 1) calculated on the basis of the strain-rate sensitivity parameter (m), which partitions power dissipation between thermal and microstructural means. The processing map reveals a domain of dynamic recrystallization in the range of 730 °C to 850 °C and 10−2 to 1−1 with its peak efficiency of 40 pct at 800 °C and 0.1 s-1 which may be considered as optimum hot-working parameters. The characteristics of dynamic recrystallization are similar to those of static recrystallization regarding the sigmoidal variation of grain size (or hardness) with temperature, although the dynamic recrystallization temperature is much higher. When deformed at 650 °C and 10-3 s-1 texture-induced dynamic recovery occurred, while at strain rates higher than 1 s-1, alpha-zirconium exhibits microstructural instabilities in the form of localized shear bands which are to be avoided in processing.


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  1. 1.
    M.J. Luton and J.J. Jonas:Can. Met. Q., 1972, vol. 11 (2), pp. 79–90.Google Scholar
  2. 2.
    D.J. Abson and J.J. Jonas:J. Nucl. Mater., 1972, vol. 42, pp. 73–85.CrossRefGoogle Scholar
  3. 3.
    H.J. McQueen and J.J. Jonas:Treatise On Materials Science and Technology, Academic Press, New York, NY, 1975, vol. 6, pp. 393–490.Google Scholar
  4. 4.
    D.H. Sastry, M.J. Luton, and J.J. Jonas:Phil. Mag., 1974, vol. 30, pp. 115–27.CrossRefGoogle Scholar
  5. 5.
    H. Buhler and H.W. Wagener:Z. Metallkd., 1967, vol. 58 (H2), pp. 136–44.Google Scholar
  6. 6.
    P. Dadras and J.F. Thomas, Jr.:Metall. Trans. A, 1981, vol. 12A, pp. 1867–73.Google Scholar
  7. 7.
    Y.V.R.K. Prasad, H.L. Gegel, S.M. Doraivelu, J.C. Malas, J.T. Morgan, K.A. Lark, and D.A. Barker:Metall. Trans. A, 1984, vol. 15A, pp. 1883–92.Google Scholar
  8. 8.
    H.L. Gegel: inExperimental Verification of Process Models, C.C. Chen, ed., ASM, Metals Park, OH, 1983, pp. 25–55.Google Scholar
  9. 9.
    Y.V.R.K. Prasad:Indian J. Technol., 1990, vol. 28, pp. 435–51.Google Scholar
  10. 10.
    A.K.S. Kalyan Kumar: M.S. Thesis, Indian Institute of Science, Bangalore, India, Oct. 1987.Google Scholar
  11. 11.
    H. Ziegler:Progress in Solid Mechanics, John Wiley and Sons, New York, NY, 1963, vol. 4, pp. 93–113.Google Scholar
  12. 12.
    P.E. Wellstead:Introduction to Physical System Modelling, Academic Press, London, 1979.Google Scholar
  13. 13.
    I. Prigogine:Science, 1978, vol. 201, (4358), pp. 777–85.CrossRefGoogle Scholar
  14. 14.
    R. Raj:Metall. Trans. A, 1981, vol. 12A, pp. 1089–97.Google Scholar
  15. 15.
    A.M. Garde:J. Nucl. Mater., 1979, vol. 80, pp. 195–206.CrossRefGoogle Scholar
  16. 16.
    D.L. Douglass:Atomic Energy Review, Suppl. 1971, International Atomic Energy Agency, Vienna, Austria, 1971, pp. 129–30.Google Scholar
  17. 17.
    L.E. Murr:Interfacial Phenomena in Metal and Alloys, Addison-Wesley Publishing Company, Reading, Massachusetts, 1975, pp. 1–253.Google Scholar
  18. 18.
    B.C. Allen:Trans. AIME, 1963, vol. 227, pp. 1175–83.Google Scholar
  19. 19.
    J.J. Jonas and M.J. Luton:Advances in Deformation Processing, Plenum Press, New York, NY, 1978, pp. 215–43.Google Scholar

Copyright information

© The Minerals, Metals and Materials Society, and ASM International 1991

Authors and Affiliations

  • J. K. Chakravartty
    • 1
  • Y. V. R. K. Prasad
    • 2
  • M. K. Asundi
    • 3
  1. 1.Metallurgy DivisionBhabha Atomic Research CentreBombayIndia
  2. 2.Department of MetallurgyIndian Institute of ScienceBangaloreIndia
  3. 3.Naval Chemical and Metallurgical LaboratoryBombayIndia

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