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Influences of stress on the measurement of mechanical properties using nanoindentation: Part I. Experimental studies in an aluminum alloy

Published online by Cambridge University Press:  31 January 2011

T. Y. Tsui ,
W. C. Oliver  and
G. M. Pharr
T. Y. Tsui
Affiliation:
Department of Materials Science, Rice University, 6100 Main Street, Houston, Texas 77005
W. C. Oliver
Affiliation:
Nano Instruments, Inc., 1001 Larson Drive, Oak Ridge, Tennessee 37830
G. M. Pharr
Affiliation:
Department of Materials Science, Rice University, 6100 Main Street, Houston, Texas 77005
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Abstract

The influence of applied stress on the measurement of hardness and elastic modulus using nanoindentation methods has been experimentally investigated using special specimens of aluminum alloy 8009 to which controlled stresses could be applied by bending. When analyzed according to standard methods, the nanoindentation data reveal changes in hardness with stress similar to those observed in conventional hardness tests. However, the same analysis shows that the elastic modulus changes with stress by as much as 10%, thus suggesting that the analysis procedure is somehow deficient. Comparison of the real indentation contact areas measured optically to those determined from the nanoindentation data shows that the apparent stress dependence of the modulus results from an underestimation of the contact area by the nanoindentation analysis procedures.

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Type
Articles
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Journal of Materials Research , Volume 11 , Issue 3 , March 1996 , pp. 752 - 759
Copyright
Copyright © Materials Research Society 1996

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References

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