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 language | English |
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Pages (from-to) | 103-111 |
Number of pages | 9 |
Journal | Journal of the European Ceramic Society |
Volume | 13 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1994 |