Low temperature superplastic flow of yttria stabilized tetragonal zirconia polycrystals

M.M.R. Boutz, A.J.A. Winnubst, A.J. Burggraaf, M. Nauer, C. Carry

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Abstract

Very fine-grained (0·2 μm), dense Y-TZP ceramics have been produced by free sintering at 1150°C. The superplastic deformation of these materials is studied in compression at low temperatures (1100-1300°C). A significant enhancement in initial strain rates was observed compared to a coarser-grained (0·4 μm) commercially available material (Tosoh, Japan). Doping with small amounts of Fe2O3 led to a further enhancement of strain rate. Deformation occurred via interface reaction controlled grain boundary sliding. Prior to deformation a continuous glassy silicate film was observed at the grain boundaries. The applicability of interface reaction controlled solution-precipitation creep models is discussed. The absence of a steady-state during deformation at low stresses is attributed to dewetting of the silicate film.
Original languageEnglish
Pages (from-to)103-111
Number of pages9
JournalJournal of the European Ceramic Society
Volume13
Issue number2
DOIs
Publication statusPublished - 1994

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