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Creep behavior of TiAl alloys with enhanced high-temperature capability

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Abstract

For high-temperature applications, creep strength is of major concern, in addition to oxidation and corrosion resistance, and determines the application range of titanium aluminide alloys in competition with other structural materials. Thus, this work was aimed at identifying mechanisms of creep deformation and microstructural degradation and at developing alloying concepts with respect to an enhanced high-temperature capability. The analysis shows that dislocation climb controls deformation in the range of the intended operation temperatures. Further, complex processes of phase transformations, recrystallization, and microstructural coarsening were observed, which contribute to microstructural degradation and limit component life in long-term service. By alloying with high contents of Nb, both room- and high-temperature strength properties can be improved as Nb increases the activation energy of diffusion and increases the propensity for twinning at ambient temperature. For alloys with enhanced high-temperature capability, microalloying with carbon is also of particular use, because carbide precipitates effectively hinder dislocation motion and are thought to increase microstructural stability.

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Authors and Affiliations

  1. the GKSS Research Centre, Institute for Materials Research, D-21502, Geesthacht, Germany

    F. Appel (Scientific Group Leader), J. D. H. Paul (Scientist), M. Oehring (Scientist), U. Fröbel (Scientist) & U. Lorenz (Technician)

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  1. F. Appel
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  2. J. D. H. Paul
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  3. M. Oehring
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  4. U. Fröbel
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  5. U. Lorenz
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Additional information

This article is based on a presentation made in the symposium entitled “Fundamentals of Structural Intermetallics,” presented at the 2002 TMS Annual Meeting, February 21–27, 2002, in Seattle, Washington, under the auspices of the ASM and TMS Joint Committee on Mechanical Behavior of Materials.

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Appel, F., Paul, J.D.H., Oehring, M. et al. Creep behavior of TiAl alloys with enhanced high-temperature capability. Metall Mater Trans A 34, 2149–2164 (2003). https://doi.org/10.1007/s11661-003-0279-6

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