Metallurgical Transactions A

, Volume 16, Issue 11, pp 1997–2005 | Cite as

Rhenium additions to a Ni-base superalloy: Effects on microstructure

  • A. F. Giamei
  • D. L. Anton
Transport Phenomena


Refractory metal alloying to superalloy single crystals has resulted in alloys possessing higher temperature capabilities than have previously been known. In this study, additions of rhenium to a modified MAR-M200* alloy were made at the expense of tungsten. A study was carried out on the γ′ precipitate growth characteristics, morphology, and lattice misfit as a function of rhenium content and aging time and temperature. Rhenium additions substantially lowered the γ′ coarsening kinetics and resulted in negative γ-γ′ misfit alloys. A qualitative model is developed which explains these results. Particle growth was shown to bevia the widely accepted diffusion controlled coarsening mechanism. Precipitates were also shown to grow by particle coalescence into irregular blocky shapes at high aging temperatures while remaining cuboidal at lower temperatures, and the necessity of using large precipitate volume fraction modifications to theoretical coarsening models is illustrated.


Metallurgical Transaction Rhenium Lattice Misfit Superalloy Single Crystal Aging Sequence 
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.
    M. Gell, D. N. Duhl, and A. F. Giamei:Superalloys 1980, J. K. Tien, S. T. Wlodek, H. Morrow, III, M. Gell, and G. E. Mauer, eds., ASM, Metals Park, OH, 1980, p. 205.Google Scholar
  2. 2.
    T. Khan and P. Caron:Fourth Riso Int. Symp. on Metallurgy and Mat. Sci., Roskilde, Denmark, 1983.Google Scholar
  3. 3.
    D. D. Pearson, F. D. Lemkey, and B. H. Kear:Superalloys 1980, J. K. Tien, S. T. Wlodek, H. Morrow, III, M. Gell, and G. E. Mauer, eds., ASM, Metals Park, OH, 1980, p. 513.Google Scholar
  4. 4.
    D. D. Pearson: United Technologies Research Center, E. Hartford, CT, unpublished research, 1983.Google Scholar
  5. 5.
    Smashey: U.S. Patent No. 3,904,402, 1975.Google Scholar
  6. 6.
    F. D. Lemkey: NADC Report N62269-79-C-0705, 1980.Google Scholar
  7. 7.
    D. L. Anton and F. D. Lemkey:Superalloys 1984, M. Gell,C. S. Kortovich, R. H. Bricknell, W. B. Kent, and J. F. Radavich, eds., AIME, Warrendale, PA, 1984, p. 601.Google Scholar
  8. 8.
    A. Kelly and R. B. Nicholson:Prog. in Mat. Sci., 1963, vol. 10, p. 149.CrossRefGoogle Scholar
  9. 9.
    A. J. Ardell, R. B. Nicholson, and J. D. Eshelby:Acta Metall., 1966, vol. 14, p. 1295.CrossRefGoogle Scholar
  10. 10.
    D. H. Kirkwood:Acta Metall., 1970, vol. 18, p. 563.CrossRefGoogle Scholar
  11. 11.
    W. O. Gentry and M. E. Fine:Acta Metall., 1972, vol. 20, p. 181.CrossRefGoogle Scholar
  12. 12.
    H. F. Merrick:Precipitation Processes in Solids, K. C. Russell and H. I. Aaronson, eds., AIME, Warrendale, PA, 1976, p. 161.Google Scholar
  13. 13.
    I. M. Lifshitz and V. V. Slyozov:J. Phys. Chem. Solids, 1961, vol. 19, p. 35.CrossRefGoogle Scholar
  14. 14.
    C. Wagner: Z.Elektrochem., 1961, vol. 65, p. 581.Google Scholar
  15. 15.
    R. G. Davies and T. J. Johnston:Ordered Alloys—Structural Applica- tion and Physical Metallurgy, B. H. Kear, C. T. Sims, N. S. Stoloff, and J. H. Westbrook, eds., Claitor’s Pub., Baton Rouge, LA, 1970, p. 447.Google Scholar
  16. 16.
    D. McLean:Metal Science, 1984, vol. 18, p. 249.CrossRefGoogle Scholar
  17. 17.
    A. D. Brailsford and P. Wynblatt:Acta Metall., 1979, vol. 27, p. 489.CrossRefGoogle Scholar
  18. 18.
    C. K. L. Davies, P. Nash, and R. N. Steves:Acta Metall., 1980, vol. 28, p. 179.CrossRefGoogle Scholar
  19. 19.
    R. D. Rawlings and A. E. Staton-Bevan:J. Mat. Sci., 1975, vol. 10, p. 505.CrossRefGoogle Scholar
  20. 20.
    J. Askill:Tracer Diffusion Data for Metals and Simple Oxides, Plenum Press, New York, NY, 1970.Google Scholar
  21. 21.
    R. A. Ricks, A. J.Porter, and R. C. Ecob:Acta Metall., 1983, vol. 31, p. 43.CrossRefGoogle Scholar
  22. 22.
    J. J. Jackson, M. J. Donachie, R. J. Henricks, and M. Gell:Metall. Trans. A, 1977, vol. 8A, p. 1615.Google Scholar
  23. 23.
    L. S. Lin, A. F. Giamei, and R. E. Doiron: 38th Ann. Proc. EMSA, 1980, p. 330.Google Scholar
  24. 24.
    A.F. Giamei: AFOSR Report F44620-76-C-0028, 1979.Google Scholar
  25. 25.
    E. Aigeltinger and M. Kerser:Metals Forum, 1981, vol. 4, p. 112.Google Scholar
  26. 26.
    R. F. Decker and J. R. Mihalisin:Trans. ASM, 1969, vol. 62, p. 481.Google Scholar
  27. 27.
    P. Beardmore, R. G. Davies, and T. L. Johnston:Trans. TMS-AIME, 1969, vol. 245, p. 1537.Google Scholar

Copyright information

© The Metallurgical of Society of AIME 1985

Authors and Affiliations

  • A. F. Giamei
    • 1
  • D. L. Anton
    • 1
  1. 1.United Technologies Research CenterEast Hartford

Personalised recommendations