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The Effects of Creep on Elastic Modulus Measurement Using Nanoindentation

Published online by Cambridge University Press:  17 March 2011

G. Feng  and
A.H.W. Ngan
G. Feng
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong Pokfulam Road, Hong Kong, P.R. China
A.H.W. Ngan
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong Pokfulam Road, Hong Kong, P.R. China
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Abstract

During the unloading segment of nanoindentation, time dependent displacement (TDD) accompanies elastic deformation. Consequently the modulus calculated by the Oliver-Pharr scheme can be overestimated. In this paper we present evidences for the influence of the measured modulus by TDD. A modification method is also presented to correct for the effects of TDD by extrapolating the TDD law in the holding process to the beginning of the unloading process. Using this method, the appropriate holding time and unloading rate can be estimated for nanoindentation test to minimise the effects of TDD. The elastic moduli of three materials computed by the modification method are compared with the results without considering the TDD effects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q7.1
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

[1] Oliver, W. C. and Pharr, G. M., J. Mater. Res., 7, 1564 (1992).Google Scholar
[2] Pharr, G. M., Mat. Sci. Eng., A253, 151 (1998).Google Scholar
[3] Flores, A. and Calleja, F. J. Baltá, Phil. Mag. A, 78, 1283 (1998).Google Scholar
[4] Lucas, B. N. and Oliver, W. C., Met. Mat. Trans., 30A, 601 (1999).Google Scholar
[5] Sangwal, K., Gorostiza, P. and Sanz, F., Surf. Sci., 446, 314 (2000).Google Scholar
[6] Mayo, M. J., Siegel, R. W., Liao, Y. X. and Nix, W. D, J. Mater. Res., 7, 973 (1992).Google Scholar
[7] Bower, A. F., Fleck, N. A., Needleman, A., and Ogbonna, N., Proc. R. Soc. Lond. A, 441, 97 (1993).Google Scholar
[8] Vlassak, J.J. and Nix, W.D., J. Mech. Phys. Solids., 42, 1223 (1994).Google Scholar