Twinning and Microcracking Associated with Monoclinic Zirconia in the Eutectic System Zirconia–Mullite

Vinayak P. Dravid*, Michael R. Notis, Charles E. Lyman

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Crystallography and morphology of twins and microcracks in the eutectic system mullite–zirconia are discussed in view of the tetragonal‐to‐monoclinic transformation and associated toughening mechanisms. Specific twin relationships were observed in monoclinic ZrO2. Highly symmetric and crystallographically well‐defined microcracks were observed at the mullite–ZrO2 interface. Microdiffraction revealed closely related crystallography of monnoclinic twins and microcracks. The number of twin variants depend on the monoclinic ZrO2 particle size. A method to calculate twinning shear strain using microcrack morphology is suggested. This parameter is essential in several fracture‐mechanics calculations.

Original languageEnglish (US)
Pages (from-to)C‐219-C‐221
JournalJournal of the American Ceramic Society
Volume71
Issue number4
DOIs
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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