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High-temperature oxidation of Ti3Al-based titanium aluminides in oxygen

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Abstract

The oxidation behavior of Ti-25Al, Ti-24Al-15Nb, and Ti-25Al-11Nb (at. pct) titanium aluminides was studied in dry oxygen at atmospheric pressure in the temperature range 1000 to 1300 K for 4 to 6 hours by thermogravimetry. The oxidation products were characterized by X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive X-ray (EDX) analysis. Although some departures from the parabolic rate law were found, the analysis of data revealed that the parabolic rate law was a more reliable basis for interpretation of results as compared to the empirical power law. Parabolic rate constants (k p ) for Ti-24Al-15Nb and Ti-25Al-11Nb were almost the same at the same temperature. However, k p values for Ti-25Al were 2 to 8 times larger than niobium-containing alloys except at 1000 K, where k p values for all three alloys were approximately the same. The effective activation energy (Q eff) was 289 kJ/mole for Ti-25Al in the range of 1000 to 1300 K, while in the case of Ti-24Al-15Nb and Ti-25Al-11Nb,Q eff values were 329 and 330 kJ/mole, respectively, in the range of 1100 to 1300 K. In general, the scales on Ti-25Al were porous and exhibited significant spallation above 1100 K. The scales were thinner, compact, and adherent for niobium-containing alloys. The scales formed on these alloys were predominantly composed of TiO2, while Al2O3 was also present as a minor constituent. The superior oxidation resistance of the niobium-containing alloys has been attributed to the doping effect of niobium in TiO2.

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Author notes

  1. T. K. Roy (Graduate Student, Assistant Manager)

    Present address: the Department of Materials and Metallurgical Engineering, Indian Institute of Technology, 208 016, Kanpur, India

Authors and Affiliations

  1. Scientific Services, Tata Iron and Steel Company, 831 007, Jamshedpur, India

    T. K. Roy (Graduate Student, Assistant Manager)

  2. the Department of Materials and Metallurgical Engineering, Indian Institute of Technology, 208 016, Kanpur, India

    R. Balasubramaniam (Assistant Professor) & A. Ghosh (Professor)

Authors
  1. T. K. Roy
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  2. R. Balasubramaniam
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Roy, T.K., Balasubramaniam, R. & Ghosh, A. High-temperature oxidation of Ti3Al-based titanium aluminides in oxygen. Metall Mater Trans A 27, 3993–4002 (1996). https://doi.org/10.1007/BF02595648

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