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Huge local elastic strains in bulk nanostructured pure zirconia materials

Abstract : From the liquid state to room temperature, two successive solid-state phase transitions occur in pure zirconia. It is well-known that the last one (tetragonal to monoclinic) is martensitic and induces large volume variations and shear strains. Elastic and inelastic behaviors of zirconia-based materials are strongly influenced by this transition and the associated strain fields that it induces. Knowledge of strain and stress at the crystal scale is thus a crucial point. Using fully dense pure zirconia polycrystals obtained by a fuse casting process, we have determined at a sub-micrometric scale, by X-ray Laue microdiffraction, the strains map at room temperature in as-cast specimens and after a post elaboration high temperature thermal treatment. We observed that the fluctuation of deviatoric elastic strain is huge, the standard deviation of normal component being in the range of 1-2%. The heat treatment tends to even further increase this range of fluctuation, despite the development of a multiscale crack network formed during the cooling. Correspondingly, the associated stress level is also huge. It lies in the 5 GPa range with stress gradient amounting 1 GPa μm − 1 .
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https://hal.univ-lorraine.fr/hal-03124299
Contributor : Nathalie Gey Connect in order to contact the contributor
Submitted on : Monday, February 22, 2021 - 9:10:28 PM
Last modification on : Friday, November 5, 2021 - 4:52:21 PM
Long-term archiving on: : Sunday, May 23, 2021 - 7:15:51 PM

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Taylan Ors, Fanny Gouraud, Vincent Michel, Marc Huger, Nathalie Gey, et al.. Huge local elastic strains in bulk nanostructured pure zirconia materials. Materials Science and Engineering: A, Elsevier, 2021, 806, pp.140817. ⟨10.1016/j.msea.2021.140817⟩. ⟨hal-03124299⟩

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