Journal of Materials Science

, Volume 25, Issue 3, pp 1640–1644 | Cite as

Mass transport of cobalt and nickel in Incoloy-800

  • M. C. Naik
  • A. R. Paul
  • K. N. G. Kaimal
  • K. S. Venkateswarlu
Article
Received:
Accepted:

Abstract

Lattice diffusion of cobalt and nickel in Incoloy-800 has been studied in the temperature range 1070 to 1500K by serial sectioning and residual activity techniques using radioactive tracers60Co and63Ni. The lattice diffusion coefficient can be expressed by the relation:
$$\begin{gathered} D_{Co/Incoloy - 800} = 2.54 x 10^{ - 5} exp \left( { - \frac{{249.5kJ mol^{ - 1} }}{{RT}}} \right)m^{^2 } sec^{ - 1} \hfill \\ D_{Ni/Incoloy - 800} = 8.62 x 10^{ - 5} exp \left( { - \frac{{255.9kJ mol^{ - 1} }}{{RT}}} \right)m^2 sec^{ - 1} \hfill \\ \end{gathered} $$
Segregation and mass transport studies of these tracers along the grain boundary in Incoloy-800 have also been carried out in the temperature range 750 to 1080 K. The grain boundary diffusion coefficients are evaluated by Whipple and Suzuoka methods and are found to be in good agreement. Grain boundary diffusivityDgb can be expressed by the equation
$$\begin{gathered} D_{gb Co/Incoloy - 800} = 1.06 x 10^{ - 5} exp \left( { - \frac{{152.72kJ mol^{ - 1} }}{{RT}}} \right)m^2 sec^{ - 1} \hfill \\ D_{gb Ni/Incoloy - 800} = 3.82 x 10^{ - 5} exp \left( { - \frac{{156.40kJ mol^{ - 1} }}{{RT}}} \right)m^2 sec^{ - 1} \hfill \\ \end{gathered} $$
Segregation of these tracers along the grain boundary in Incoloy-800 has been studied by autoradiographic technique. The results have been discussed and presented in this paper.

Keywords

Polymer Nickel Cobalt Diffusion Coefficient Mass Transport 
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.
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. R. Paul, M. C. Naik andK. N. G. Kaimal,J. Nucl. Mater. 58 (1975) 205.Google Scholar
  2. 2.
    A. R. Paul, M. C. Naik andK. S. Venkateswarlu,J. Nucl. Mater. 149 (1987) 277.Google Scholar
  3. 3.
    R. T. Whipple,Phil. Mag. 45 (1954) 1225.Google Scholar
  4. 4.
    J. Crank, “The Mathematics of Diffusion”, 1st edn (Oxford University Press, 1956) p. 9.Google Scholar
  5. 5.
    G. B. Federov, E. A. Smirnov andF. I. Zhomov,Met. i Metalloved. Chistykh Metal., Sb. Nauchn. Rabot 4 (1963) 110.Google Scholar
  6. 6.
    C. Zener,J. Appl. Phys. 22 (1951) 372.Google Scholar
  7. 7.
    D. Gupta, D. R. Campbell andP. S. Ho, “Thin Films Interdiffusion and Reactions”, edited by J. M. Paole, K. N. Tu and J. W. Mayer (Wiley, New York, 1978).Google Scholar
  8. 8.
    N. L. Peterson,Int. Met. Rev. 28 (1983) 65.Google Scholar
  9. 9.
    G. E. Murch andS. J. Rothman,Diffusion Data 42 (1985) 17.Google Scholar
  10. 10.
    P. Benoist andG. Martin,Thin Solid Films 25 (1975) 181.Google Scholar
  11. 11.
    T. Suzuoka,Trans. Jpn. Inst. Metals 2 (1961) 25.Google Scholar
  12. 12.
    Idem, J. Phys. Soc. Jpn. 19 (1964) 839.Google Scholar
  13. 13.
    A. R. Paul andR. P. Agarwala,Met. Trans. 2 (1971) 2691.Google Scholar
  14. 14.
    A. R. Wazzan,J. Appl. Phys. 36 (1965) 3596.Google Scholar
  15. 15.
    A. D. Leclaire,British J. Appl. Phys. 14 (1963) 351.Google Scholar

Copyright information

© Chapman and Hall Ltd 1990

Authors and Affiliations

  • M. C. Naik
    • 1
  • A. R. Paul
    • 1
  • K. N. G. Kaimal
    • 1
  • K. S. Venkateswarlu
    • 1
  1. 1.Water Chemistry DivisionBhabha Atomic Research CentreTrombay, BombayIndia

Personalised recommendations