Huge local elastic strains in bulk nanostructured pure zirconia materials

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:806

Article

Ors, Taylan^1,2  Gouraud, Fanny^3,4  Michel, Vincent¹  Huger, Marc³  Gey, Nathalie⁵  Micha, Jean-Sebastien^6,7  Castelnau, Olivier¹  Guinebretiere, Rene³ 

[1] HESAM, CNAM, ENSAM, PIMM,UMR CNRS 8006, 151 Blvd Hop, F-75013 Paris, France

[2] Univ Haute Alsace, IS2M, UMR CNRS 7361, 3Bis Rue Alfred Werner, F-68093 Mulhouse, France

[3] Univ Limoges, IRCER, UMR CNRS 7315, 12 Rue Atlantis, F-87068 Limoges, France

[4] CITRA, 16 Rue Atlantis,Parc ESTER, Limoges, France

[5] Univ Lorraine, LEM3, Arts & Metiers Paris Tech, UMR CNRS 7239, F-57000 Metz, France

[6] Beamline European Synchrotron ESRF, CRG IF BM32, 17 Rue Martyrs, F-38054 Grenoble 9, France

[7] Grenoble Alpes Univ, UMR SYMMES CEA Grenoble Inst Nanosci & Cryogen, 17 Rue Martyrs, F-38054 Grenoble 9, France

关键词: Pure zirconia;    Residual strains;    X-ray laue microdiffraction;    Electron backscatter diffraction;   

DOI  :  10.1016/j.msea.2021.140817

来源: Elsevier

【 摘 要 】

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 mu m(-1).

【 授权许可】

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