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Instrumented Vickers microindentation of alumina-based materials

Published online by Cambridge University Press:  01 January 2006

S. Bueno  and
C. Baudin
S. Bueno
Affiliation:
Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Cientificas, Campus de Cantoblanco, 28049 Madrid, Spain
C. Baudin*
Affiliation:
Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Cientificas, Campus de Cantoblanco, 28049 Madrid, Spain
*
a)Address all correspondence to this author. e-mail: cbaudin@icv.csic.es
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Abstract

The adequacy of instrumented Vickers depth-sensing microindentation to determine Young's modulus of alumina-based ceramics was analyzed. Monophase alumina materials and alumina + 10 vol% aluminium titanate composites, with different microstructures, were tested to determine the effect of microcracking. The load–depth penetration of the indenter curves together with the observation of the imprints by scanning electron microscopy were used to analyze the behavior of the materials. Maximum stiffness was determined from the derivatives of the load-depth curves during unloading. The areas of the imprints measured optically were more representative of the behavior of the materials than the areas calculated from depth-penetration measurements. The formation of microcracks affected the shape of the unloading portion of the curves. Significant differences between the values of Young's modulus determined for different materials and definite relationships between the microstructural parameters of the materials and the Young's modulus were found.

Keywords

Grain sizeMicrostructureElastic properties
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 161 - 173
Copyright
Copyright © Materials Research Society 2006

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