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The Ferroelastic Transformation in Yttria- and Ceria-Stabilised Tetragonal Zirconia Via Neutron Diffraction
Published online by Cambridge University Press: 22 February 2011
Abstract
Neutron diffraction studies of tetragonal zirconia polycrystals (TZP) subjected to a varying applied uniaxial stress indicates that a ferroelastic crystalline transformation occurs within the bulk of the material. The critical coercive stress was determined to be (1.65±0.03) GPa for yttria stabilised TZP and (0.70±0.05) GPa for ceria stabilised TZP. The results agree well with previous reports concerning the ferroelasticity of tetragonal zirconia, and provide direct evidence indicating that the anomalies observed using the first X-ray diffraction studies originate from the bulk of the ceramic and not solely from the surface. The preferred orientation observed in the tetragonal crystallites was measured as a function of applied uniaxial stress and interpreted via a resolved stress criterion. It is believed that the ferroelastic transformation can act as an energy absorbing mechanism and hence toughen zirconia or ceramics containing dispersed zirconia.
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- Copyright © Materials Research Society 1995
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