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Article Dans Une Revue Journal of the European Ceramic Society Année : 2021

Development of transformation bands in ceria-stabilized-zirconia based composites during bending at room temperature

Résumé

Transformation-induced plasticity in a ceria-stabilized-zirconia based composite was studied in four-point bending, with particular emphasis on nucleation and growth of tetragonal-to-monoclinic transformation bands. They initiated on the side in tension at a given value of stress and grow in size and number with increased applied load. The spacing between them was related to samples’ thickness: thicker samples led to a smaller number of larger/deeper bands. Residual stresses around indentations, placed on the tensile surface of some samples, triggered transformation bands nucleation but had no significant effect on the final total number of bands. A simple stress shielding model suggests that wide bands hinder adjacent thinner bands to propagate and expand because of stress shielding around them. Nucleation of a given transformation band is thus related to: (i) stress concentrations at the surface, (ii) geometry (stress-field inside the sample) and (iii) a shielding effect from the bands already present.
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Dates et versions

hal-03066945 , version 1 (15-12-2020)

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Aléthéa Liens, Michael Swain, Helen Reveron, Jérôme Cavoret, Philippe Sainsot, et al.. Development of transformation bands in ceria-stabilized-zirconia based composites during bending at room temperature. Journal of the European Ceramic Society, 2021, 41 (1), pp.691-705. ⟨10.1016/j.jeurceramsoc.2020.08.062⟩. ⟨hal-03066945⟩
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