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00244 OXIDATION BEHAVIOR OF ENGINEERING GAMMA TITANIUM ALUMINIDE ALLOYS

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Product Number: 51300-00244-SG
ISBN: 00244 2000 CP
Author: M. Yoshihara, Y-W. Kim
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The oxidation behavior of nine titanium aluminide alloys has been studied in air under isothermal conditions at 870°C and under cyclic exposure conditions at 760°C and 870°C. The isothermal oxidation of engineering titanium aluminide alloys at 870°C reveals that the mass gain due to oxidation consists of three stages, that is; the first with a linear gain, the second with parabolic increase, and the third with linear gain. Increased oxidation resistance was observed with increasing Nb content (up to 10 at%) in both isothermal and cyclic oxidation tests. This resulted from suppression of the growth of TiO2 and formation of a continuous and compact Al2O3 scale layer. However, even 8-10 at% Nb contents were not sufficient in cyclic oxidation at 870°C. Small addition of Si, B, C and Hf does not appear to influence the oxidation behavior. The addition of 1 at% Mo did not improve the oxidation resistance under both isothermal nor cyclic oxidation condition. Keywords: titanium aluminide, high temperature, air oxidation, alloying, Nb addition
The oxidation behavior of nine titanium aluminide alloys has been studied in air under isothermal conditions at 870°C and under cyclic exposure conditions at 760°C and 870°C. The isothermal oxidation of engineering titanium aluminide alloys at 870°C reveals that the mass gain due to oxidation consists of three stages, that is; the first with a linear gain, the second with parabolic increase, and the third with linear gain. Increased oxidation resistance was observed with increasing Nb content (up to 10 at%) in both isothermal and cyclic oxidation tests. This resulted from suppression of the growth of TiO2 and formation of a continuous and compact Al2O3 scale layer. However, even 8-10 at% Nb contents were not sufficient in cyclic oxidation at 870°C. Small addition of Si, B, C and Hf does not appear to influence the oxidation behavior. The addition of 1 at% Mo did not improve the oxidation resistance under both isothermal nor cyclic oxidation condition. Keywords: titanium aluminide, high temperature, air oxidation, alloying, Nb addition
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