Journal of Materials Science

, Volume 28, Issue 19, pp 5269–5274 | Cite as

Processing maps for hot working of Cu-Ni-Zn alloys

Part I α — nickel silver
  • D. Padmavardhani
  • Y. V. R. K. Prasad


The constitutive behaviour of α — nickel silver in the temperature range 700–950 °C and strain rate range 0.001–100 s−1 was characterized with the help of a processing map generated on the basis of the principles of the “dynamic materials model” of Prasadet al Using the flow stress data, processing maps showing the variation of the efficiency of power dissipation (given by 2m/(m+1) wherem is the strain-rate sensitivity) with temperature and strain rate were obtained, α-nickel silver exhibits a single domain at temperatures greater than 750 °C and at strain rates lower than 1s−1, with a maximum efficiency of 38% occurring at about 950 °C and at a strain rate of 0.1 s−1. In the domain the material undergoes dynamic recrystallization (DRX). On the basis of a model, it is shown that the DRX is controlled by the rate of interface formation (nucleation) which depends on the diffusion-controlled process of thermal recovery by climb. At high strain rates (10 and 100s−1) the material undergoes microstructural instabilities, the manifestations of which are in the form of adiabatic shear bands and strain markings.


Polymer Nickel Recrystallization High Strain Shear Band 
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  1. 1.
    K. J. Gardner andR. Grines,Met. Sci. 13 (1979) 216.CrossRefGoogle Scholar
  2. 2.
    D. N. Crowther andB. Mintz,Mater. Sci. Technol. 2 (1986) 771.Google Scholar
  3. 3.
    P. J. Wray,Metall. Trans. A 15A (1984) 2009.CrossRefGoogle Scholar
  4. 4.
    H. J. McQueen andJ. J. Jonas, in “Treatise on Materials Science and Technology”, Vol. 6 edited by R. J. Arsenault, (Academic Press, New York, 1975) p. 393.Google Scholar
  5. 5.
    O. D. Sherby andP. M. Burke,Progr. Mater. Sci. 13 (1968) 323.CrossRefGoogle Scholar
  6. 6.
    J. Hennaut, J. Othmezouri andJ. Charlies,Z. Metallkde 73 (1982) 744.Google Scholar
  7. 7.
    D. Padmavardhani andY. V. R. K. Prasad,Mater. Sci. Engg. A. 157 (1992) 43.CrossRefGoogle Scholar
  8. 8.
    D. M. Ward andB. J. Helliwell,J. Inst. Metals 98 (1970) 199.Google Scholar
  9. 9.
    K. J. Anusavice andR. T. DeHoff,Metall. Trans. A 3A (1972) 1279.CrossRefGoogle Scholar
  10. 10.
    D. Padmavardhani andY. V. R. K. Prasad,ibid. 22A (1991) 2996.Google Scholar
  11. 11.
    Y. V. R. K. Prasad, H. L. Gegel, S. M. Doraivelu, J. C. Malas, J. T. Morgan, K. A. Lark andD. R. Barker,ibid. 15A (1984) 1883.CrossRefGoogle Scholar
  12. 12.
    H. L. Gegel, J. C. Malas, S. M. Doraivelu andV. A. Shende, in “Metals Handbook”, 9th Edn. Vol. 14 (ASM International, Metals Park, Ohio, 1987) p.417.Google Scholar
  13. 13.
    J. M. Alexander, in “Modelling of Hot Deformation of Steels”, edited by J. G. Lenard (Springer, Berlin, 1989) p. 101.CrossRefGoogle Scholar
  14. 14.
    J. K. Chakravartty, Y. V. R. K. Prasad andM. K. Asundi,Metall. Trans. A 22A (1991) 1089.Google Scholar
  15. 15.
    N. Ravichandran andY. V. R. K. Prasad,ibid. 22A (1991) 2339.CrossRefGoogle Scholar
  16. 16.
    D. Padmavardhani andY. V. R. K. Prasad,ibid. 22A (1991) 2985.CrossRefGoogle Scholar
  17. 17.
    R. J. Jackson, D. A. Edge andD. C. Moore,J. Inst. Metals 98 (1970) 193.Google Scholar
  18. 18.
    R. Raj,Metall. Trans. A 12A (1981) 1089.CrossRefGoogle Scholar
  19. 19.
    A. K. S. Kalyan kumar, “Criteria For Predicting Metallurgical Instabilities in Processing, MSc thesis, Indian Institute of Science, Bangalore (1987).Google Scholar
  20. 20.
    Y. V. R. K. Prasad,Indian J. Tech. 28 (1990) 435.Google Scholar
  21. 21.
    H. Ziegler, in “Progress in Solid Mechanics”, edited by I. N. Sneddon and R. Hill (North-Holland, Amsterdam, 1963) p. 93.Google Scholar
  22. 22.
    D. Padmavardhani andY. V. R. K. Prasad,Z. Metallkde,84 (1993) 1.Google Scholar
  23. 23.
    W. Roberts, in “Deformation Processing and Structure”, edited by G. Krauss (ASM Metals Park, Ohio, 1984) p. 109.Google Scholar
  24. 24.
    N. Ravichandran andY. V. R. K. Prasad,Bull. Mater. Sci. 14 (1991) 1241.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • D. Padmavardhani
    • 1
  • Y. V. R. K. Prasad
    • 1
  1. 1.Department of MetallurgyIndian Institute of ScienceBangaloreIndia

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