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Hrtem Observation and EAM Calculation of Dislocation Cores in Nial

Published online by Cambridge University Press:  01 January 1992

M. J. Mills ,
M. S. Daw ,
S. M. Foiles  and
D.B. Miracle
M. J. Mills
Affiliation:
Sandia National Laboratories, Livermore, CA 94550
M. S. Daw
Affiliation:
Sandia National Laboratories, Livermore, CA 94550
S. M. Foiles
Affiliation:
Sandia National Laboratories, Livermore, CA 94550
D.B. Miracle
Affiliation:
Wright Laboratory, Wright-Patterson AFB, OH 45433
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Abstract

High resolution transmission electron microscopy (HRTEM) has been used to observe the core structures of a<100> and a<110> edge dislocations in bicrystals of stoichiometric NiAl. The images indicate that the core of a<100> edge dislocations are compact. Two different core structures have been observed for a<110> edge dislocations. In one configuration, the a<110> dislocation is decomposed into two a<100> dislocations, while in the other it is climb-dissociated into partial dislocations. Both configurations are non-planar on the scale of about 1 nm. EAM calculations have been performed to determine the relative energies and stabilities of these configurations. The implications of these core configurations are briefly discussed with respect to the macroscopic flow behavior of NiAl.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 257
Copyright
Copyright © Materials Research Society 1995

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References

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