The isothermal oxidation behavior of a ternary Ti-25Al-18Ta intermetallic alloy has been investigated in pure oxygen over the temperature range of 850°C to 1100°C.The oxidation kinetics was found to follow a parabolic rate.Effective activation energy of 259 kJ/mol was deduced from the oxidation data.The oxidation products were a mixture of Ti0 2 , the main component, A1 2 0 3 (alumina), and small amounts of tantalum oxide.The addition of Ta to Ti 3 Al alloy decreased the oxidation rate of the alloy.However, the oxidation scale was not compact and exhibited significant spallation especially at high temperatures.
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Reddy et al. (2002) studied this question.
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