Isothermal oxidation of TiAl alloy |
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| Authors: | R. G. Reddy X. Wen M. Divakar |
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| Affiliation: | (1) the Department of Metallurgical and Materials Engineering, The University of Alabama, 35487-0202 Tuscaloosa, AL |
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| Abstract: | Isothermal oxidation behavior of Ti-48.6 at. pct Al alloy was studied in pure dry oxygen over the temperature range 850 °C to 1000 °C. The oxidation was essentially parabolic at all temperatures with significant increase in the rate at 1000 °C. Effective activation energy of 404 kJ/mol was deduced. The oxidation products were a mixture of TiO2 (rutile) and α-Al2O3 at all temperatures. An external protective layer of alumina was not observed on this alloy at any of the temperatures studied. A layered structure of oxides was formed on the alloy at 1000 °C. |
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