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Orientation Relationships and Interfaces Between Low Symmetry Phases in The Yttria-Alumina System

Published online by Cambridge University Press:  15 February 2011

R. S. Hay
R. S. Hay*
Affiliation:
Wright Laboratory, Materials Directorate WPAFB, Dayton, OH 45433
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Abstract

Interphase boundaries and orientation relationships for yttria - yttrium-aluminum monoclinic and yttrium-aluminum monoclinic - yttrium-aluminum perovskite eutectics were observed by standard and high resolution TEM techniques. Three and five orientation relationships were found for each system, respectively. These eutectics all had a monoclinic phase and therefore had little potential for high symmetry overlap. In many cases low index planes with similer spacings or spacing multiples were parallel. However, presence of a monoclinic phase made definition of a three-dimensional low index near-CSL very difficult, so a combination of planes corresponding to reciprocal-space directions and zones corresponding to real-space directions were often needed for a geometric description of the orientation relationship. In general, two planes and the real-space direction corresponding to the zone for these planes described the orientation relationships. The disregistry between reciprocal-space coincidence sites was not localized by dislocations large enough to be visible.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 145
Copyright
Copyright © Materials Research Society 1995

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