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Interpretation of Alumina/Yttrium-Aluminum Garnet Orientation Relationships by Geometric Criteria

Published online by Cambridge University Press:  26 February 2011

R.S. Hay  and
L.E. Matson
R.S. Hay
Affiliation:
Wright Research and Development Center, WPAFB OH 45433
L.E. Matson
Affiliation:
Wright Research and Development Center, WPAFB OH 45433
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Abstract

Geometric criteria for low interface energy and interface structure were tested for the cubic-rhombohedral system YAG/alumina. Orientation relationships near (111){110}a // (112){110}y and facets on (111)a(112)y were observed in both sol-gel derived composites and directionally solidified eutectic composites. The ΣYAG=12 near-CSL of 2{111}, {110}, {112} was inferred to be the preferred structural unit. Dislocations with b=1/3{111}a and b=1/2{110}a were observed and inferred to accomodate deviation from the structural unit, respectively. The {110}a,y direction met some of the criteria for an invariant line. Although the OR was explained by geometric criteria it would have been difficult to predict it with such criteria

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 731
Copyright
Copyright © Materials Research Society 1991

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