Abstract
Quantitative investigations on pore growth in a tetragonal zirconia polycrystals (TZP) and a doped alumina have been carried out under both tension and compression. Results show that the change of pore morphology during both tensile and compressive superplastic deformation is controlled by plastic deformation of the matrix material and can be described by the relationship of dR/dg3 = ηR, where ε is the true strain and η is a coefficient and R is the radius of the pore. For compressive deformation, the pore shrinkage is controlled by superplastic deformation such that η c = −η t. Cracks associated with the artificial pores in the doped alumina are clearly caused by local stress concentrations at the pores. The absence of pore-induced cracks in the TZP may be due to the more “metallic” behaviour of TZP compared to the doped alumina.
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