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Failure behavior of alumina and alumina/silicon carbide nanocomposites with natural and artificial flaws

Published online by Cambridge University Press:  31 January 2011

F. Meschke ,
P. Alves-Riccardo ,
G. A. Schneider  and
N. Claussen
F. Meschke*
Affiliation:
Advanced Ceramics Group, Technische Universität Hamburg-Harburg, 21073 Hamburg, Germany
P. Alves-Riccardo
Affiliation:
Advanced Ceramics Group, Technische Universität Hamburg-Harburg, 21073 Hamburg, Germany
G. A. Schneider
Affiliation:
Advanced Ceramics Group, Technische Universität Hamburg-Harburg, 21073 Hamburg, Germany
N. Claussen
Affiliation:
Advanced Ceramics Group, Technische Universität Hamburg-Harburg, 21073 Hamburg, Germany
*
a)Author, who should be addressed for correspondence, is now with Lehigh University, Materials Research Center, 5E Whitaker Laboratory, Bethlehem 18015, Pennsylvania. E-mail: [email protected].
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Abstract

Alumina/silicon carbide nanocomposites with 5 vol.% SiC nanoparticles were produced by slip casting, pressureless sintering, and hot isostatic pressing. The grain size dependence of both the bend strength and fracture toughness have been investigated. The strength exceeds 1 GPa at a grain size of 1.7 μm. Crack opening displacements (COD) were measured, revealing that crack tip toughness is considerably lower than in pure alumina and an R-curve behavior is unlikely to occur. By introducing artificial pores with a size of 60 μm, the micromechanical fracture process has been studied in both pure alumina and nanocomposites. In contrast to alumina, where an annular precrack forms prior to fracture, it is suggested that precrack formation is strongly impeded in the nanocomposites and failure is controlled by microcrack initiation. The high strength of Al2O3/SiC nanocomposites seems to be the result of an unusually high crack initiation stress.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 12 , December 1997 , pp. 3307 - 3315
Copyright
Copyright © Materials Research Society 1997

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