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Nanoindetation of Yttria doped zirconia: effect of crystallographic structure on deformation mechanisms
Gaillard, Yves; Anglada Gomila, Marcos Juan; Jiménez Piqué, Emilio
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural i Fiabilitat dels Materials
This article presents a nanoindentation study of polycrystalline and single crystals of yttria-doped zirconia with both tetragonal and cubic phases. Analysis of the deformation mechanisms is performed by both atomic force microscopy (AFM) and micro-Raman spectroscopy. Phase transformation from tetragonal to monoclinic phase is clearly distinguished on tetragonal crystals, whereas in cubic crystals the plastic deformation seems to be controlled by dislocation nucleation and interactions. AFM observations in tetragonal zirconia grains have shown that both grain size and autocatalytic transformation strongly influence the size of the transformed zone. Furthermore, the martensitic phase transformation seems to be also strongly dependent of the indenter shape. Experimental results suggest that a critical contact pressure is necessary to induce the phase transformation.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Materials science
Deformacions (Mecànica)
Resistència de materials
Attribution-NonCommercial-NoDerivs 3.0 Spain

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