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The Use of Symmetry in the TEM Analysts of Precipitate Morphologies

Published online by Cambridge University Press:  25 February 2011

U. Dahmen  and
K. H. Westhacott
U. Dahmen
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
K. H. Westhacott
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
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Abstract

This study points out how symmetry properties inherent in precipitation reactions can be exploitet to facilitate and improve the accuracy of a morphological analysis by TEM. A method is given for the simple determination of the direction and distribution of needle precipitates and the habit plane of plate precipitates based on the use of symmetry properties of the matrix crystal. The bicrystal symmetry of different orientation relationships between cubic crystals and its connection with observed and equilibrium shapes is illustrated with examples of high resolution micrographs of Ge precipitates in an Al matrix.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 62: Symposium Q – Materials Problem Solving with the Transmission Electron Microscope , 1985 , 217
Copyright
Copyright © Materials Research Society 1986

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