EDP Sciences Journals List
Issue J. Phys. IV France
Volume 03, Number C9, Décembre 1993
Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
Page(s) C9-395 - C9-402
DOI http://dx.doi.org/10.1051/jp4:1993941

Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température

J. Phys. IV France 03 (1993) C9-395-C9-402

DOI: 10.1051/jp4:1993941

Oxidation behavior of titanium aluminides

G.H. Meier1, F.S. Pettit1 and S. Hu2

1  University of Pittsburgh, Pittsburgh, PA 15261, U.S.A.
2  Lockheed Palo Alto Research Laboratory, Palo Alto, CA 94304, U.S.A.


Abstract
Results from an ongoing study of the high temperature oxidation of intermetallic compounds in the Ti-Al system are presented. The oxidation behavior of alloys based on TiAl (γ) has been found to be extremely complex depending on temperature and atmosphere composition. Protective alumina scales are formed in pure O2 up to a critical temperature above which a mixed TiO2/Al2O3 scale forms and grows at rates which are orders-of-magnitude faster than that of alumina. This phenomenon is believed to result from the formation of Al-containing internal oxides which coupled with the closeness in stability of alumina and the titanium oxides, prevents the alumina from becoming continuous. Continuous alumina scales were not observed, even at temperatures below 1000 °C, when N2 was present in the oxidizing gas. The effect of the N2 has been shown to be involved with the initial development of the reaction products.



© EDP Sciences 1993