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Residual Stress Determination and Subsurface Microstructure in Ground and Polished Alumina/Silicon Carbide Nanocomposites and Monolithic Alumina Ceramics

Published online by Cambridge University Press:  21 February 2011

H.Z. Wu ,
S.G. Roberts ,
A.J. Winn  and
B. Derby
H.Z. Wu
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, K
S.G. Roberts
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, K
A.J. Winn
Affiliation:
Manchester Materials Science Centre, Grosvenor Street, Manchester M1 7HS, K
B. Derby
Affiliation:
Manchester Materials Science Centre, Grosvenor Street, Manchester M1 7HS, K
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Abstract

The surface residual stress state induced by grinding and polishing an alumina/silicon carbide nanocomposite and monolithic alumina has been investigated using Hertzian indentation and fluorescence spectroscopy. Specimens were ground and then polished with diamond slurry with grit sizes ranging between 8 μm and 1 μm. The results show that the surface residual stress state in the nanocomposites is more sensitive to surface treatment than that in the monolithic alumina. Surfaces of both ceramics were examined in cross-section by TEM and direct observations were made of the plastic deformation induced by different surface treatments. There is a change in the predominant deformation micromechanism from twinning in the alumina to dislocation generation in the nanocomposites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 303
Copyright
Copyright © Materials Research Society 2000

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References

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