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Characterization of Grain Boundaries in Superplastically Deformed Y‐TZP Ceramics
Author(s) -
Boutz Michel M. R.,
Chen Chu Sheng,
Winnubst Louis,
Burggraaf Anthonie J.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb04654.x
Subject(s) - materials science , grain boundary , dewetting , superplasticity , amorphous solid , yttrium , ceramic , composite material , deformation (meteorology) , sintering , transmission electron microscopy , characterization (materials science) , deformation mechanism , metallurgy , grain boundary strengthening , grain boundary sliding , mineralogy , microstructure , crystallography , nanotechnology , wetting , chemistry , oxide
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.