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Fracture mode of alumina/silicon carbide nanocomposites

Published online by Cambridge University Press:  31 January 2011

André Zimmermann ,
Mark Hoffman  and
Jürgen Rödel
André Zimmermann
Affiliation:
Darmstadt University of Technology, Department of Materials Science, Petersenstrasse 23, 64287 Darmstadt, Germany
Mark Hoffman
Affiliation:
University of New South Wales, School of Materials Science and Engineering, Sydney, NSW 2052, Australia
Jürgen Rödel
Affiliation:
Darmstadt University of Technology, Department of Materials Science, Petersenstrasse 23, 64287 Darmstadt, Germany
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Extract

Computer simulations have been designed to elucidate the evolution of microcracking in a nanocomposite using appropriate material values for alumina and silicon carbide. These are compared to a single-phase material using elastic and thermal expansion coefficients for alumina. It is found that the region and the fracture mode where microcracking ensues are determined by the intensity and the length scale of the residual stress fields, which interact. Of specific interest are the region, fracture mode, and length of ensuing microcracks for materials with different inclusion locations (at the grain boundary or within the grain) and with different grain size to inclusion size ratios.

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Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 107 - 114
Copyright
Copyright © Materials Research Society 2000

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