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

Citation
Ln. Brewer et al., Interface modification for increased fracture toughness in reaction-formedyttrium aluminum garnet/alumina eutectic composites, J MATER RES, 14(10), 1999, pp. 3907-3912
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS RESEARCH
ISSN journal
0884-2914 → ACNP
Volume
14
Issue
10
Year of publication
1999
Pages
3907 - 3912
Database
ISI
SICI code
0884-2914(199910)14:10<3907:IMFIFT>2.0.ZU;2-E
Abstract
The validity of controlling interfacial toughness in reaction-formed compos ites was explored using solid-state reaction processing and microanalysis t echniques. A variety of rare-earth oxides was added to a yttrium aluminum g arnet (YAG)/alumina powder mixture and then melted in air. Some melts retai ned the crystallography and microstructure of the pure, binary YAG-alumina eutectic. Using scanning transmission electron microscopy in conjunction wi th 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.