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Crack Healing in an Alumina/Silicon Carbide Nanocomposite After Grinding and Annealing

Published online by Cambridge University Press:  21 February 2011

H.Z. Wu ,
J.M. Titchmarsh ,
S.G. Roberts  and
B. Derby
H.Z. Wu
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OXI 3PH, K
J.M. Titchmarsh
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OXI 3PH, K
S.G. Roberts
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OXI 3PH, K
B. Derby
Affiliation:
Manchester Materials Science Centre, Grosvenor Street, Manchester Ml 7HS, K
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Abstract

Alumina/silicon carbide nanocomposites are known to show their highest strength levels after surface grinding followed by annealing. After annealing in flowing argon, nanocomposites with very coarsely ground surfaces have strengths exceeding those with a finely polished surface. Specimens with lapped surfaces also show a small improvement in strength on annealing. TEM investigations of annealed cross-sections show that the annealing process leads to surface crack healing. The chemical composition of the subsurface region has been studied, and reactive products on and close to the nanocomposite surface after annealing have been investigated by energy dispersive X-ray analysis in the STEM.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 327
Copyright
Copyright © Materials Research Society 2000

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References

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