Skip to main content
SpringerLink
Log in

Protective Al2O3 scale formation on NbAl3-base alloys

  • Published:
Oxidation of Metals Aims and scope Submit manuscript

Abstract

The oxidation of NbAl3 with additions of Cr and Y was studied to determine the mechanisms of the beneficial effects of these elements upon oxidation. Cr additions to the binary Nb Al3 alloy of up to 6.8 at. % reduced the scale growth rates and promoted α-Al2O3 formation over much longer times relative to binary NbAl3. A major effect of Cr is to form a layer of AlNbCr at the metal/ scale interface, which is inherently more oxidation-resistant than the matrix alloy in the long term. Yttrium additions to a Cr-containing alloy improved the scale growth rate and adherence, and changed the scale micro structure to mimic that of a typical protective Al2O3 scale.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. R. C. Svedburg, inProperties of High Temperature Alloys, Z. A. Foroulis and F. S. Pettit, eds. (The Electrochemical Society, 1976). pp. 331–361.

  2. J. Berkowitz-Mattuck and M. Rossetti (NASA CR-125071, 1971).

  3. M. G. Hebsur, J. R. Stephens, J. L. Smialek, C. A. Barrett, and D. S. Fox, inOxidation of High-Temperature Intermetallics, T. Grobstein and J. Doychak, eds. (TMS, Warrendale, Pennsylvania, 1989), 171–184.

    Google Scholar 

  4. R. A. Perkins, K. T. Chiang, and G. H. Meier,Scripta Met. 22, 419–424 (1988).

    Google Scholar 

  5. M. G. Hebsur and J. R. Stephens (Approved U.S. Patent Serial no. 07/406,700, 1990).

  6. J. Doychak, C. A. Barrett, J. L. Smialek, M. G. Hebsur, and D. L. Humphrey, (NASA CP-10039, 1989), p. 23–1.

  7. T. B. Massalski, ed.,Binary Phase Diagrams, Vol. 1 (ASM, 1986).

  8. P. Villars and L. D. Calvert,Pearson's Handbook of Crystallography Data for Intermetallic Phases, Vol. 2 (ASM, 1985), p. 939.

  9. J. Doychak, J. L. Smialek, and T. E. Mitchell,Met. Trans. 20A, 499–518 (1989).

    Google Scholar 

  10. B. B. Argent, inNiobium: Proceedings of the International Symposium, H. Stuart, ed. (TMS, Warrendale, Pennsylvania, 1984), pp. 325–416.

    Google Scholar 

  11. C. R. Hunt, Jr., and A. Raman,Z. Metallkunde 59, 701–707 (1968).

    Google Scholar 

  12. B. H. Kear, F. S. Pettit, D. E. Fornwalt, and L. P. Lemaire,Oxid. Met. 3, 557–570 (1971).

    Google Scholar 

  13. D. P. Whittle and J. Stringer,Phil. Trans. R. Soc. Lond. A295, 309–329 (1980).

    Google Scholar 

Download references

Author information

Author notes

  1. J. Doychak

    Present address: NASA Lewis Research Center, 44135, Cleveland, Ohio

Authors and Affiliations

  1. NASA Lewis Research Center Group, Sverdrup Technology, Inc., 44142, Brookpark, Ohio

    J. Doychak & M. G. Hebsur

Authors
  1. J. Doychak
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. M. G. Hebsur
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Doychak, J., Hebsur, M.G. Protective Al2O3 scale formation on NbAl3-base alloys. Oxid Met 36, 113–141 (1991). https://doi.org/10.1007/BF00938458

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00938458

Key Words

Search

Navigation