Energy of Planar Faults as a Function of Composition in Binary and Ternary TiAl Alloys
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ENERGY OF PLANAR FAULTS AS A FUNCTION OF COMPOSITION IN BINARY AND TERNARY TiAI ALLOYS
C. Woodward, J. M. MacLaren* and D. M. Dimiduk** UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH 45432 *Department of Physics, Tulane University, New Orleans, LA 70118 "**Wright Laboratory, WL/MLLM, Wright Patterson AFB, OH 45433-6533 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 y TiAI 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 (TixAli-x where 52:5x
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