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Modeling creep deformation of a two-phase TiAI/Ti3Al alloy with a lamellar microstructure

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Abstract

A two-phase TiAl/Ti3Al alloy with a lamellar microstructure has been previously shown to exhibit a lower minimum creep rate than the minimum creep rates of the constituent TiAl and Ti3Al single-phase alloys. Fiducial-line experiments described in the present article demonstrate that the creep rates of the constituent phases within the two-phase TiAl/Ti3Al lamellar alloy tested in compression are more than an order of magnitude lower than the creep rates of single-phase TiAl and Ti3Al alloys tested in compression at the same stress and temperature. Additionally, the fiducial-line experiments show that no interfacial sliding of the phases in the TiAl/Ti3Al lamellar alloy occurs during creep. The lower creep rate of the lamellar alloy is attributed to enhanced hardening of the constituent phases within the lamellar microstructure. A composite-strength model has been formulated to predict the creep rate of the lamellar alloy, taking into account the lower creep rates of the constituent phases within the lamellar micro-structure. Application of the model yields a very good correlation between predicted and experimentally observed minimum creep rates over moderate stress and temperature ranges.

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Authors and Affiliations

  1. Corporate Research and Development, Reynolds Metal Company, 23219, Richmond, VA

    Michael F. Bartholomeusz (Research Scientist)

  2. Department of Materials Science and Engineering, University of Virginia, 22903-2442, Charlottesville, VA

    John A. Wert (Professor)

Authors
  1. Michael F. Bartholomeusz
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  2. John A. Wert
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Formerly with the Department of Materials Science and Engineering, University of Virginia

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Bartholomeusz, M.F., Wert, J.A. Modeling creep deformation of a two-phase TiAI/Ti3Al alloy with a lamellar microstructure. Metall Mater Trans A 25, 2161–2171 (1994). https://doi.org/10.1007/BF02652317

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  • DOI: https://doi.org/10.1007/BF02652317

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