Crack-interface interactions in a tungsten-yttria-stabilized-zirconia directionally solidified eutectic

Thomas C. Isabell*, Vinayak P Dravid, D. Norman Hill

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A directionally solidified eutectic (DSE) of W-ZrO2(Y2O3) consists of faceted fibers of tungsten embedded in yttria-stabilized cubic zirconia. The W-ZrO2 interfaces in this system are devoid of any impurity phases or a reaction product. Microindentation-induced cracks and their interactions with interphase interfaces are investigated using scanning and transmission electron microscopy. Crack-interface interactions are found to fall into one of four categories: propagation along the metal-ceramic interface, deflection away from the interface, crack-interface bridging, and shearing of tungsten fibers. Further crack propagation is investigated in situ in a TEM with a propagation induced by local electron beam heating. These crack path selections are analyzed within the framework of phenomenological understanding of crack-interface interactions in composites.

Original languageEnglish (US)
Pages (from-to)412-416
Number of pages5
JournalJournal of the American Ceramic Society
Volume79
Issue number2
DOIs
StatePublished - Jan 1 1996

ASJC Scopus subject areas

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

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