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Mechanical properties of nanophase TiO2 as determined by nanoindentation

Published online by Cambridge University Press:  31 January 2011

M. J. Mayo ,
R. W. Siegel ,
A. Narayanasamy  and
W. D. Nix
M. J. Mayo
Affiliation:
Ceramics Development Division, Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185
R. W. Siegel
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
A. Narayanasamy
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
W. D. Nix
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
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Abstract

Nanoindenter techniques have been used to determine the hardness. Young's modulus, and strain rate sensitivity of nanophase TiO2, which is currently available only in very small quantities and which cannot be tested by most conventional techniques. Hardness and Young's modulus both increase linearly with sintering temperature over the range 25–900°C but come to within only 50–70% of the single crystal values. Strain rate sensitivity, on the other hand, is measurably greater for this material than for single crystal rutile, and the value of strain rate sensitivity increases as the grain size and the sintering temperature are decreased. In its as-compacted form, the strain rate sensitivity of nanophase TiO2 is approximately a quarter that of lead at room temperature, indicating a potential for significant ductility in these ceramic materials. Finally, a significant scatter in hardness values has been detected within individual nanophase samples. This is interpreted as arising from microstructural inhomogeneity in these materials.

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Type
Articles
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Journal of Materials Research , Volume 5 , Issue 5 , May 1990 , pp. 1073 - 1082
Copyright
Copyright © Materials Research Society 1990

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References

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