Effects of Cr and Nb on the high temperature oxidation of TiAl |
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| Authors: | D. B. Lee K. B. Park M. Nakamura |
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| Affiliation: | (1) Structures, and Materials Performance Laboratory, Institute for Aerospace Research, National Research Council of Canada, Ottawa, ON, K1A 0R6, Canada;(2) School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea |
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| Abstract: | From isothermal and cyclic oxidation tests on thermomechanically treated Ti-51%Al, Ti-47%Al-4%Cr, and Ti-48%Al-2%Cr-2%Nb alloys at 800, 900, 1000°C in air, it was found that Ti-48%Al-2%Cr-2%Nb and Ti-47%Al-4%Cr had the best and the worst oxidation resistance, respectively. The oxide scales consisted primarily of TiO2 and Al2O3, with and without a small amount of dissolved Cr and Nb ions, depending on the alloy composition. These ions were slightly enriched inside the inner oxide layer, and strongly enriched around the scale-matrix interface. The outer TiO2-rich layer was formed by the outward diffusion of Ti ions, while the inner (TiO2+Al2O3) mixed layer was formed by the inward transport of oxygen. The outward movement of Al ions formed the intermediated Al2O3-rich layer, above the prepared alloys. |
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