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Journal of Materials Science

, Volume 25, Issue 10, pp 4341–4348 | Cite as

Electron microprobe investigation of lower melting regions in the as-cast structure of DS200 + Hf single crystal

  • A. Baldan
Papers

Abstract

The elemental characteristics of incipient melting (or lower melting) regions in as-cast DS200 + Hf single crystal were investigated in detail. In addition to the Ni5Hf phase, the Ni7Hf2-type compound was observed to exist in the incipient melting regions. Ni7Hf2 and Ni5Hf showed considerable solubilities for chromium, cobalt and aluminium. Chromium and cobalt replace nickel in the INi7Hf2 phase. A large variability of composition was observed in the incipient melting regions. For example, nickel and hafnium contents varied between 27.35 and 59.94wt% and 14.47 and 54.87 wt%, respectively.

Keywords

Polymer Aluminium Nickel Chromium Cobalt 
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.

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References

  1. 1.
    D. N. Duhl,J. Metals 23 (7) (1971) 38.Google Scholar
  2. 2.
    D. N. Duhl, J. S. Erickson andC. P. Sullivan,Metal Prog. 103(3) (1973) 38.Google Scholar
  3. 3.
    Z. Yunrong, W. Luobao andL. Changgong, in Proceedings of the First ASM European Technical Conference, “Advanced Materials and Processing Techniques for Structural Applications”, edited by T. Khan and A. Lasalmonie, Paris, 7–9 September 1987, (Office National D'Etudes et De Recherches Aerospatials BP72-92322 Chatillon Cedex, France) p. 111.Google Scholar
  4. 4.
    J. J. Burke, H. L. Wheaton andJ. R. Feller, paper presented at the 1978 Annual AIME Meeting, Denver, Colorado, February, 1978.Google Scholar
  5. 5.
    P. Nash andD. R. F. West,Metal Sci. August (1981) 347.Google Scholar
  6. 6.
    A. E. Dwight,Trans. ASM 53 (1961) 479.Google Scholar
  7. 7.
    A. Baldan,J. Mater. Sci. 25 (1990).Google Scholar
  8. 8.
    F. R. Eshelman andJ. F. Smith,Acta Crystallogr. 28 (1972) 1594.Google Scholar
  9. 9.
    Y. Murata, R. Ninomiya andN. Yukawa,Scripta Metall. 22 (1988) 21.Google Scholar
  10. 10.
    Y. Zheng andY. Cai, “Superalloys 1980” (ASM, Metals Park, Ohio, 1980) p. 465.Google Scholar
  11. 11.
    L. N. Zimina, N. N. Burova andO. V. Maku-Shok,Met. Sci. Heat Treat. (USSR) 28(1-2) (1986) 130.Google Scholar
  12. 12.
    P. Nash andD. R. F. West,Metal Sci. 15 (1981) 353.Google Scholar
  13. 13.
    Z. Yunrong andC. Yulin, in “Proceedings of the 4th International Symposium on Superalloys”, edited by J. K. Tien, S. T. Wlodek, H. Marrow, M. Gell and G. E. Maurer (ASM, Metals Park. Ohio, 1980) p. 465.Google Scholar
  14. 14.
    R. Sellamuthu andA. F. Giamei,Met. Trans. 17A (1986) 419.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1990

Authors and Affiliations

  • A. Baldan
    • 1
  1. 1.Division of Materials Science and TechnologyCSIRPretoriaRepublic of South Africa

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