Characterization of grain boundaries in superplastically deformed Y-TZP ceramics

Michel M.R. Boutz, Chu Sheng Chen, Louis Winnubst, Anthonie J. Burggraaf

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Abstract

The effects of compressive deformation on the grain boundary characteristics of fine-grained Y-TZP have been investigated using surface spectroscopy, impedance analysis, and transmission electron microscopy. After sintering at low temperature (1150°C), the grain boundaries are covered by an ultrathin (1nm) yttrium-rich amorphous film. After deformation at 1200°–1300°C under low stress, some grain boundaries are no longer covered by the amorphous film. Yttrium segregation seems to occur only at wetted grain boundaries. Evidence has been found that the extent of dewetting increases with increasing applied stress.
Original languageEnglish
Pages (from-to)2632-2640
Number of pages9
JournalJournal of the American Ceramic Society
Volume77
Issue number10
DOIs
Publication statusPublished - 1994

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