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

Published online by Cambridge University Press:  01 January 1992

C. Woodward ,
J. M. MacLaren  and
D. M. Dimiduk
C. Woodward
Affiliation:
UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH 45432
J. M. MacLaren
Affiliation:
Department of Physics, Tulane University, New Orleans, LA 70118
D. M. Dimiduk
Affiliation:
Wright Laboratory, WL/MLLM, Wright Patterson AFB, OH 45433-6533
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 171
Copyright
Copyright © Materials Research Society 1995

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References

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