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Driving force for discontinuous coarsening in a Ni-Al-Mo base superalloy

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Abstract

The driving force and mechanism for discontinuous coarsening (DC) in a Ni-Al-Mo base superalloy were studied. Samples were solutionized at 1300 °C, cooled, and aged at 1150 °C to produce DC. Both the intragranular and DC-produced microstructure were studied using optical and scanning electron microscopy of metallographically prepared surfaces and scanning transmission electron microscopy (STEM) of thin foils. Resulting microstructural and microchemical information were analyzed to elucidate the DC process. Grain boundary diffusion of Mo appeared to control the DC growth rate. The principal contributor to the DC driving force was determined to be coarsening of semicoherentγ′ with coarsening of the Mo-rich a phase makingα minor contribution. Using the estimated driving force, grain boundary diffusivities were calculated which were within a factor of 3 of published values for stationary boundaries of comparable misorientation.

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References

  1. D. B. Williams and E. P. Butler:International Metals Review, 1981, vol. 26, p. 153.

    CAS  Google Scholar 

  2. W. Gust:Phase Transformations, 1979, vol. 1, p. 27.

    Google Scholar 

  3. A.W. Funkenbusch:Metall. Trans. A, 1983, vol. 14A, p. 1283.

    CAS  Google Scholar 

  4. E.H. Aigeltinger and M. Kersker:Metals Forum, 1981, vol. 4, p. 112.

    CAS  Google Scholar 

  5. V. Bišs and D. L. Sponseller:Metall. Trans., 1973, vol. 4, p. 1953.

    Google Scholar 

  6. E.H. Aigeltinger, S.R. Bates, R.W. Gould, J. J. Hren, and F.N. Rhines:Proc. Conf. Rapid Solidification Processing, R. Mehrabian, B.H. Kear, and M. Cohen, eds., Claitor’s Publishing Div., Baton Rouge, LA, 1978, p. 291.

    Google Scholar 

  7. A.J. Ardell and R.B. Nicholson:Acta Metall., 1966, vol. 14, p. 1295.

    Article  CAS  Google Scholar 

  8. K. Whitehead and L. D. Brownlee:Planseeber Pulvermet, 1956, vol. 4, p. 62.

    CAS  Google Scholar 

  9. D.T. Cromer, A.C. Larson, and R.B. Roof:Acta Cryst., 1964, vol. 17, p. 272.

    Article  CAS  Google Scholar 

  10. D.M. Dimiduk:Metall. Trans. A, 1983, vol. 14A, p. 493.

    Google Scholar 

  11. C. S. Smith:Imperfections in Newly Perfect Crystals, W. Shockley, ed., John Wiley and Sons, New York, NY, 1952.

    Google Scholar 

  12. R. A. Swalin:Thermodynamics of Solids, John Wiley and Sons, New York, NY, 1962, p. 212.

    Google Scholar 

  13. N. A. Gjostein and F. N. Rhines:Acta Metall., 1959, vol. 7, p. 319.

    Article  CAS  Google Scholar 

  14. J. D. Livingston and J. W. Cahn:Acta Metall., 1974, vol. 22, p. 495.

    Article  CAS  Google Scholar 

  15. W. R. Upthegrove and M. J. Sinnott:Trans. ASM, 1953, vol. 50, p. 1031.

    Google Scholar 

  16. W. Lange, A. Hassner, and G. Mischer:Phys. Stat. Solids, 1964, vol. 5, p. 63.

    CAS  Google Scholar 

Download references

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Authors and Affiliations

  1. United Technologies Research Center, 06108, East Hartford, CT

    A. W. Funkenbusch (Research Metallurgist), T. A. Stephenson (Research Metallurgist) & G. McCarthy (Research Metallurgist)

  2. The University of Illinois, Champaign, IL

    H. Fraser (Associate Professor)

Authors
  1. A. W. Funkenbusch
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  2. T. A. Stephenson
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  3. G. McCarthy
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  4. H. Fraser
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Funkenbusch, A.W., Stephenson, T.A., McCarthy, G. et al. Driving force for discontinuous coarsening in a Ni-Al-Mo base superalloy. Metall Trans A 16, 11–16 (1985). https://doi.org/10.1007/BF02656706

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  • DOI: https://doi.org/10.1007/BF02656706

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