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Effects of temperature on the fatigue crack growth behavior of cast gamma-based titanium aluminides

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Abstract

This article reports the results of an experimental study of the effects of temperature (25 °C, 450 °C, and 700 °C) on the fatigue crack growth behavior of three near-commercial cast gamma titanium aluminide alloys (Ti-48Al-2Cr-2Nb, Ti-47Al-2Mn-2Nb+0.8 pct TiB2, and Ti-45Al-2Mn-2Nb+0.8 pct TiB2). The trends in the fatigue crack growth rate data are explained by considering the combined effects of crack-tip deformation mechanisms and oxide-induced crack closure. Faster fatigue crack growth rates at 450 °C are attributed to the high incidence of irreversible deformation-induced twinning, while slower crack growth rates at 700 °C are due to increased deformation by slip and the effects of oxide-induced crack closure.

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Authors and Affiliations

  1. the Princeton Materials Institute and Department of Mechanical and Aerospace Engineering, Princeton University, 08544, Princeton, NJ

    C. Mercer (Staff Scientist), S. M. Allameh (Staff Scientist), J. Lou (Graduate Research Assistant) & W. O. Soboyejo (Professor)

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  1. C. Mercer
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  2. S. M. Allameh
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  3. J. Lou
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  4. W. O. Soboyejo
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Mercer, C., Allameh, S.M., Lou, J. et al. Effects of temperature on the fatigue crack growth behavior of cast gamma-based titanium aluminides. Metall Mater Trans A 32, 2781–2794 (2001). https://doi.org/10.1007/s11661-001-1029-2

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  • DOI: https://doi.org/10.1007/s11661-001-1029-2

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