J. Phys. III France
Volume 5, Numéro 11, November 1995
Page(s) 1841 - 1847
DOI: 10.1051/jp3:1995223
J. Phys. III France 5 (1995) 1841-1847

High Temperature Deformation of Fine-Grained Yttria-Stabilized Zirconia Reinforced with Al 2O 3 Platelets

L. Andrades, A. Bravo-León, M. Jiménez-Melendo and A. Domínguez-Rodríguez

Departamento de Física de la Materia Condensada, Universidad de Sevilla, Aptdo. 1065, 41080 Sevilla, Spain

(Received 6 February 1995, revised 20 June 1995, accepted 10 July 1995)

3 mol% Y 2O 3-stabilized Tetragonal Zirconia Polycrystals (Y-TZP) reinforced with 15% vol. Al 2O 3 platelets have been deformed in compression at constant strain rates between 10 -5 and $2\times10^{-3}$ s -1 and temperatures between 1250 and 1400  $^{\circ}$C. The composites have been found to behave in a similar way to monolithic Y-TZP. The strain rate controlling mechanism is characterized by a stress exponent n of 2, the deformation being achieved by grain boundary sliding. No increase in the creep resistance due to platelet-reinforcement was found because of the high ductility of the zirconia matrix.

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