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

Luke N. Brewer, Derrick P. Endler, Shani Austin, Vinayak P. Dravid, Joseph M. Collins

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)3907-3912
Number of pages6
JournalJournal of Materials Research
Volume14
Issue number10
DOIs
StatePublished - Oct 1999

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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