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Compressive creep behavior of spray-formed gamma titanium aluminide

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Abstract

The creep behavior of spray-formed γ-TiAl with a fine, equiaxed fully lamellar (FL) microstructure was studied in a temperature-stress regime of 780 °C to 850 °C and 180 to 320 MPa. An apparent stress exponent of 4.3 and an activation energy of 342 kJ/mol were observed in the high-temperature high-stress regime. Compared with the FL γ-TiAl which was obtained through conventional casting+heat treatment processes, the spray-formed γ-TiAl exhibited higher creep resistance. The higher creep resistance observed in the present study was discussed in light of the interstitial level, the chemical composition, the grain size, and the interlocking of lamellae at the grain boundary, which in turn may be a function of interlamellar spacing and the step height of the serrated grain boundaries. It was suggested that the small interlamellar spacing and possibly larger step height may contribute to the higher creep resistance observed in the present study.

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Authors and Affiliations

  1. the Department of Chemical and Biochemical Engineering and Materials Science, University of California, 92697-2575, Irvine, CA

    B. Li (Graduate Student), J. Wolfenstine (Assistant Professor), J. C. Earthman (Associate Professor) & E. J. Lavernia (Professor)

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  1. B. Li
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  2. J. Wolfenstine
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  3. J. C. Earthman
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  4. E. J. Lavernia
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Li, B., Wolfenstine, J., Earthman, J.C. et al. Compressive creep behavior of spray-formed gamma titanium aluminide. Metall Mater Trans A 28, 1849–1857 (1997). https://doi.org/10.1007/s11661-997-0115-5

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  • DOI: https://doi.org/10.1007/s11661-997-0115-5

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