Effects of temperature on the fatigue crack growth behavior of cast gamma-based titanium aluminides |
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| Authors: | C. Mercer S. M. Allameh J. Lou W. O. Soboyejo |
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| Affiliation: | (1) the Princeton Materials Institute and Department of Mechanical and Aerospace Engineering, Princeton University, 08544 Princeton, NJ |
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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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