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The oxidation and protection of gamma titanium aluminides

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Abstract

The excellent density-specific properties of the gamma class of titanium aluminides make them attractive for intermediate-temperature (600–850 °C) aerospace applications. The oxidation and embrittlement resistance of these alloys is superior to that of the α2 and orthorhombic classes of titanium aluminides. However, since gamma alloys form an intermixed Al2O3TiO2 scale in air rather than the desired continuous Al2O3 scale, oxidation resistance is inadequate at the high end of this temperature range (i.e., greater than 750–800°C). For applications at such temperatures, an oxidation-resistant coating will be needed; however, a major drawback of the oxidation-resistant coatings currently available is severe degradation in fatigue life by the coating. A new class of oxidation-resistant coatings based in the Ti-Al-Cr system offers the potential for improved fatigue life.

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Authors and Affiliations

  1. NASA Lewis Research Center, Cleveland, Ohio, USA

    Michael P. Brady Ph.D. (National Research Council post-doctoral fellow, member of TMS), William J. Brindley Ph.D. (research scientist), James L. Smialek Ph.D. (senior research scientist) & Ivan E. Locci Ph.D. (principal researcher, research associate)

  2. Case Western Reserve University, Cleveland, Ohio, USA

    Ivan E. Locci Ph.D. (principal researcher, research associate)

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  1. Michael P. Brady Ph.D.
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  2. William J. Brindley Ph.D.
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  3. James L. Smialek Ph.D.
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  4. Ivan E. Locci Ph.D.
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Brady, M.P., Brindley, W.J., Smialek, J.L. et al. The oxidation and protection of gamma titanium aluminides. JOM 48, 46–50 (1996). https://doi.org/10.1007/BF03223244

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