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Nanoindentation of yttria-doped zirconia: Effect of crystallographic structure on deformation mechanisms

Published online by Cambridge University Press:  31 January 2011

Y. Gaillard ,
M. Anglada  and
E. Jiménez-Piqué
Y. Gaillard
Affiliation:
Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Universitat Politècnica de Catalunya, 08028 Barcelona, Spain
M. Anglada
Affiliation:
Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Universitat Politècnica de Catalunya, 08028 Barcelona, Spain
E. Jiménez-Piqué*
Affiliation:
Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Universitat Politècnica de Catalunya, 08028 Barcelona, Spain
*
a) Address all correspondence to this author.e-mail: emilio.jimenez@upc.es
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Abstract

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.

Keywords

CeramicNanoindentationPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 719 - 727
Copyright
Copyright © Materials Research Society 2009

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