Improvement in oxidation resistance of the intermetallic compound titanium aluminide by heat treatment under a low partial pressure oxygen atmosphere |
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| Authors: | E. Kobayashi M. Yoshihara R. Tanaka |
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| Affiliation: | 1. The Graduate School, Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Midoriku, Yokohama 227, Japan;2. Tanaka are in the Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240, Japan |
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| Abstract: | The improvement in oxidation resistance of an intermetallic compound TiAl was investigated by means of a new type of surface treatment: heat treatment under a low partial pressure oxygen atmosphere. The specimens treated by this method showed superior oxidation resistance compared with a nickel-base superalloy Inconel 713C during cyclic heating to a temperature of 1173 K in static air. The best conditions for the heat treatment under a low partial pressure oxygen atmosphere were found to be: pressure, 6.7 X 10-3 Pa; temperature, 1273 K; time, 7.2 ks (2 h) or more. It was presumed that the excellent oxidation resistance resulting from this method is due to preferential formation of a thin, strong Al203 surface layer. |
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| Keywords: | Titanium aluminide Oxidation resistance Heat treatment |
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