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Energy of Planar Faults as a Function of Composition in Binary and Ternary TiAl Alloys

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Abstract

Establishing the chemical dependence of thermally activated processes which govern plasticity in intermetallic alloys requires that the dislocation dissociation reactions be determined as a function of composition. A major parameter governing such reactions is the relative fault stability as a function of composition. Here the results of first principles electronic structure calculations, using the layer Korringa-Kohn-Rostoker method, are reported for planar faults in γ TiAl at various compositions. The influence of dilute substitutional impurities on the fault energies is treated using the coherent potential approximation. The variation of fault energies as a function of binary composition (TixAl1-x where 52≤x≤49) and the addition of transition metals (Cr, Mn and Nb at 2% concentration) are presented. The influence of this chemical dependence on the stability of <101] super-dislocations is discussed, along with expected trends in the flow stress behavior.

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Acknowledgements

The authors gratefully acknowledge numerous useful discussions with Drs. S. Rao, T.A. Partharasarthy and P.M. Hazzledine. This work was sponsored by the U.S. Air Force under the contract #F33615-91-C-5663.

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Authors and Affiliations

  1. UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH, 45432

    C. Woodward

  2. Department of Physics, Tulane University, New Orleans, LA, 70118

    J. M. MacLaren

  3. Wright Laboratory, WL/MLLM, Wright Patterson AFB, OH, 45433-6533

    D. M. Dimiduk

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  1. C. Woodward
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  2. J. M. MacLaren
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  3. D. M. Dimiduk
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Woodward, C., MacLaren, J.M. & Dimiduk, D.M. Energy of Planar Faults as a Function of Composition in Binary and Ternary TiAl Alloys. MRS Online Proceedings Library 288, 171–176 (1992). https://doi.org/10.1557/PROC-288-171

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