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Title: Determination of grain boundary volume expansion by HREM

Abstract

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, {delta}), 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 {plus_minus}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.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10144612
Report Number(s):
ANL/MSD/CP-82465; CONF-940275-2
ON: DE94010452
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: Symposium on high-voltage and high-resolution electron microscopy,Stuttgart (Germany),21-24 Feb 1994; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION; GRAIN BOUNDARIES; THERMODYNAMIC PROPERTIES; MEASURING METHODS; GOLD; ELECTRON MICROSCOPY; ERRORS; TWINNING; VOLUME; EXPANSION; 360102; 440800; STRUCTURE AND PHASE STUDIES; MISCELLANEOUS INSTRUMENTATION

Citation Formats

Buckett, M.I., and Merkle, K.L. Determination of grain boundary volume expansion by HREM. United States: N. p., 1994. Web.
Buckett, M.I., & Merkle, K.L. Determination of grain boundary volume expansion by HREM. United States.
Buckett, M.I., and Merkle, K.L. Tue . "Determination of grain boundary volume expansion by HREM". United States. https://www.osti.gov/servlets/purl/10144612.
@article{osti_10144612,
title = {Determination of grain boundary volume expansion by HREM},
author = {Buckett, M.I. and Merkle, K.L.},
abstractNote = {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, {delta}), 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 {plus_minus}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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}

Conference:
Other availability
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