Abstract
This paper presents a study of surface segregation in NiCrAlY and FeCrAlY type alloys. The segre-gation was measured using Auger electron spectroscopy. Samples were heated in the spectrometer to temperatures between 800 and 1100 °C, and segregation was measured at temperature as a function of time. The results show that when yttrium and sulfur were present in the alloy, they segregated to the surface where their concentrations were greatly enriched over their bulk concentrations. The presence of yttrium in the alloy did not eliminate sulfur segregation. The surface concentration of aluminum appeared, in most cases, to be greater than its bulk concentration. However, because of uncertainty in sensitivity factors for Auger emission, this point could not be conclusively proven. Cobalt and chromium, in contrast, were depleted from the surface. Sulfur segregation was also ex-amined in Ni-S, Cr-S, Al-S, and Y-S binary alloys. Sulfur was found to segregate extensively in the nickel and chromium alloys, but to a much less extent in aluminum. No sulfur segregation was ob-served in the yttrium alloy.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
L.B. Pfeil: U.K. Patent No. 459848, 1937.
D. P. Whittle and J. Stringer:Phil. Trans. Roy. Soc. London A, 1980, vol. 295, p. 309.
J. G. Smeggil, A. W. Funkenbusch, and N. S. Borastein: presented at the spring 1984 meeting, Electrochemical Society, Cincinnati, OH, May 1984.
K. L. Luthra and C. L. Briant: presented at the spring 1984 meeting, Electrochemical Society, Cincinnati, OH, May 1984.
A.W. Funkenbusch, J. G. Smeggil, and N. S. Bornstein:Metall. Trans. A, 1985, vol. 16A, p. 1164.
J. L. Smialek and R. Browning:Proc. Symp. on High Temperature Materials III, Z. A. Munir and D. F. Cubicciotti, eds., Electrochem. Soc, Pennington, NJ, 1986, p. 258.
C.L. Briant:Acta Metall., 1985, vol. 33, p. 1241.
C. Pichard, J. Rieu, and C. Goux:Metall. Trans. A, 1976, vol. 7A, p. 1811.
R. A. Mulford:Metall. Trans. A, 1983, vol. 14A, p. 865.
R. A. Mulford: inEmbrittlement of Engineering Alloys, C. L. Briant and S.K. Banerji, eds., Academic Press, Treatise on Materials Sci- ence, 1983, vol. 25, p. 1.
C.L. Briant and R.A. Mulford:Metall. Trans. A, 1982, vol. 13A, p. 745.
J.J. Burton, B.J. Berkowitz, and R.D. Kane:Metall. Trans. A, 1979, vol. 10A, p. 677.
M. Oku, K. Hirokawa, H. Kimura, and S. Suzuki:Surface and Inter- face Analysis, 1986, vol. 9, p. 67.
M. P. Seah: inPractical Surface Analysis, D. Briggs and M. P. Seah, eds., John Wiley and Sons, Ltd., London, 1985, p. 181.
K.L. Luthra and C.L. Briant:Metall. Trans. A, 1988, vol. 19A, pp. 2091–98.
K.L. Luthra and C.L. Briant:Oxidation of Metals, 1986, vol. 26, p. 397.
K.H. Johnson and S.V. Pepper:J. Appl. Phys., 1982, vol. 53, p. 6634.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Briant, C.L., Luthra, K.L. Surface segregation in MCrAlY alloys. Metall Trans A 19, 2099–2108 (1988). https://doi.org/10.1007/BF02645212
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02645212