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Oxidation of Ti−14Al−21Nb in air and oxygen from 700 to 1000°C

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Abstract

The oxidation behavior of Ti−14Al−21Nb in air and in oxygen was determined over the temperature range 700 to 1000°C. Weight gains in both atmospheres were measured using thermogravimetric analysis. The resulting oxidation products were identified using X-ray diffraction, and oxide morphology was evaluated using electron microscopy and wavelength-dispersive X-ray analysis. Total weight gains in oxygen were up to four times higher than in air, and a higher percentage of the weight gain in oxygen was due to oxygen dissolution into the metal. Based on metallurgical examination of the oxidized specimens, it was concluded that the lower oxidation weight gains in air are due to the formation of a thin layer of TiN and TiAl at the oxide-metal interface which inhibits the diffusion of oxygen into the metal.

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Authors and Affiliations

  1. NASA Langley Research Center, Mail Stop 188A, 23681-0001, Hampton, Virginia

    T. A. Wallace & R. K. Clark

  2. Analytical Services and Materials, Inc., 107 Research Drive, 23666, Hampton, Virginia

    K. E. Wiedemann

Authors
  1. T. A. Wallace
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  2. R. K. Clark
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  3. K. E. Wiedemann
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Wallace, T.A., Clark, R.K. & Wiedemann, K.E. Oxidation of Ti−14Al−21Nb in air and oxygen from 700 to 1000°C. Oxid Met 42, 451–464 (1994). https://doi.org/10.1007/BF01046760

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  • DOI: https://doi.org/10.1007/BF01046760

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