Abstract
Thermodynamic data from the literature were used to calculate the activity variations of Ti and Al in the Ti-Al system at 700, 900, and 1100°C and of Ti and Si in the Ti-Si system at 800, 1000, and 1300°C. The activity data were then applied to estimate the stable oxide phase in equilibrium with the metal phase, assuming that the activity of the oxide phase was unity. It was found that in the Ti-Al-O system the stable oxide changed from TiO to Al 2O3 in the existence region of the TiAl phase, while in the Ti-Si-O system a comparable change from Ti-oxide to SiO 2 occurred in the existence region of the Ti 5Si3 phase. The significance of these results to the oxidation of intermetallics in the Ti-Al and Ti-Si systems is discussed briefly.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
A. Steiner and K. L. Komarek,Trans. Met. Soc. AIME 230, 786 (1964).
N. C. Oforka and B. B. Argent,J. Less-Common Metals 114, 97 (1985).
L. Kaufmann and H. Nesor,CALPHAD 2, 326 (1978).
T. B. Massalsk et al.,Binary Alloy Phase Diagrams, Vol.1, (Amer. Soc. Metals, 1986), p. 173.
S. Becker, A. Rahmel, and M. Schütze (to be published).
P. Kofstad,High Temperature Corrosion (Elsevier, New York, 1988).
Y. Umakoshi, M. Yamagushi, T. Sakagami, and T. Yamani,J. Mater. Sci. 24, 1599 (1989).
E. U. Lee and J. Waldman,Scripta Metall. 22, 1389 (1988).
R. A. Perkins, K. T. Chiang, and G. H. Meier,Scripta Metall. 21, 1505 (1987).
R. A. Perkins, K. T. Chiang, G. H. Meier, and R. Miller, inOxidation of High Temperature Intermetallics, T. Grobstein and J. Doychak, eds. (The Mineral, Metals and Materials Society 1989), S. 157.
O. Kubaschewski, inAtomic Energy Review (Special Issue No.9, International Atomic Energy Agency, Vienna, 1983, S. 441 ff).
L. Kaufmann and H. Nesor,CALPHAD 3, 45 (1979).
M. Hansen and K. Anderko,Constitution of Binary Alloys (McGraw-Hill, New York, 1958).
R. P. Elliott,Constitution of Binary Alloys (First Supplement, 1965).
E. M. Levin, C. R. Robbins, and H. F. McMurdie,Phase Diagrams for Ceramists (The American Ceramic Society, 1964), p. 69.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rahmel, A., Spencer, P.J. Thermodynamic aspects of TiAl and TiSi2 oxidation: The Al-Ti-O and Si-Ti-O Phase diagrams. Oxid Met 35, 53–68 (1991). https://doi.org/10.1007/BF00666500
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00666500