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Interface modification for increased fracture toughness in reaction-formed yttrium aluminum garnet/alumina eutectic composites

Published online by Cambridge University Press:  31 January 2011

Luke N. Brewer ,
Derrick P. Endler ,
Shani Austin ,
Vinayak P. Dravid  and
Joseph M. Collins
Luke N. Brewer
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Derrick P. Endler
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Shani Austin
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Vinayak P. Dravid
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Joseph M. Collins
Affiliation:
Saphikon Inc., Milford, New Hampshire 03055
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Abstract

The validity of controlling interfacial toughness in reaction-formed composites was explored using solid-state reaction processing and microanalysis techniques. A variety of rare-earth oxides was added to a yttrium aluminum garnet (YAG)/alumina powder mixture and then melted in air. Some melts retained the crystallography and microstructure of the pure, binary YAG–alumina eutectic. Using scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy, rare-earth ions were observed both to segregate to the YAG/alumina interface and to form a third phase. Some evidence of increased crack deflection at these interfaces was observed via indentation fracture.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 10 , October 1999 , pp. 3907 - 3912
Copyright
Copyright © Materials Research Society 1999

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