Determination of grain boundary volume expansion by HREM [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 17 pages : digital, PDF file
Additional Creators:: Argonne National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

High resolution electron microscopy (HREM) has provided invaluable insight into the structure of grain boundaries at the atomistic level. Quantitative HREM methods are now in development which, combined with atomistic simulations, can provide further insight into grain boundary structure-energy correlations. For example, the volume expansion (or excess free volume, δ), a thermodynamic parameter directly related to the grain boundary energy, is represented by the normal component of the rigid body translation. Although its magnitude is small, it can be determined experimentally using statistical techniques which locate and fit the peak and valley positions in an experimental HREM image - i.e., a direct measurement of the lattice fringe displacements is made. We have modified the lattice fringe displacement technique such that a measurement accuracy of better than ±0.002a{sub o} can be achieved. Precise knowledge of the position and intensity of the image contrast and a detailed understanding of the sources of error are required. This paper provides a detailed description of the lattice fringe displacement technique as well as an analysis of the sources of error in the measurement.

Report Numbers:

E 1.99:anl/msd/cp--82465
E 1.99: conf-940275--2
conf-940275--2
anl/msd/cp--82465

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Note:

Published through SciTech Connect.
03/01/1994.
"anl/msd/cp--82465"
" conf-940275--2"
"DE94010452"
Symposium on high-voltage and high-resolution electron microscopy,Stuttgart (Germany),21-24 Feb 1994.
Merkle, K.L.; Buckett, M.I.

Funding Information:

W-31109-ENG-38

View MARC record | catkey: 14455903