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Measurement of Planar Fault Energies in Ni3Ge-Fe3Ge Intermetallic Alloys

Published online by Cambridge University Press:  10 February 2011

Mukul Kumar ,
T. J. Balk  and
K. J. Hemker
Mukul Kumar
Affiliation:
Now at Lawrence Livermore National Laboratory, University of California, L-370, Livermore, CA 94550
T. J. Balk
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218-2686
K. J. Hemker
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218-2686
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Abstract

A combination of transmission electron microscopy (TEM) and image simulations has facilitated a highly quantitative measure of superdislocation dissociations. The experimental observations have been corrected for image shifts within the framework of anisotropic elasticity by comparison with simulated images. This allows experimental quantification of planar fault energies, thus providing a benchmark for first principles and atomistic simulations and fundamental insight towards alloy modeling and design. Such measurements of superdislocation dissociations on the order of 1-15 nm have been recorded for the pseudobinary Ni3Ge-Fe3Ge alloy system. These detailed measurements of fault widths obtained by weak-beam TEM observations of deformation structures will be presented and discussed as a function of alloy composition. The transition from anomalous to normal temperature dependence of yielding behavior in these alloys will also be discussed in terms of observed dislocation structures and planar fault energies calculated using the above measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 538: Symposium J – Multiscale Modelling of Materials , 1998 , 329
Copyright
Copyright © Materials Research Society 1999

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