Low temperature superplastic flow of yttria stabilized tetragonal zirconia polycrystals

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Boutz, M.M.R. and Winnubst, A.J.A. and Burggraaf, A.J. and Nauer, M. and Carry, C. (1994) Low temperature superplastic flow of yttria stabilized tetragonal zirconia polycrystals. Journal of the European Ceramic Society, 13 (2). pp. 103-111. ISSN 0955-2219

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Abstract:Very fine-grained (0·2 um), 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 ¿m) 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.
Item Type:Article
Copyright:© 1994 Elsevier Science
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/12691
Official URL:http://dx.doi.org/10.1016/0955-2219(94)90107-4
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