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Monitoring Time-Dependent Deformation in Small Volumes

Published online by Cambridge University Press:  22 February 2011

T P Weihs  and
J B Pethica
T P Weihs
Affiliation:
Department of Materials, Oxford University, Parks Road, Oxford 0X1 3PH, England.
J B Pethica
Affiliation:
Department of Materials, Oxford University, Parks Road, Oxford 0X1 3PH, England.
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Abstract

Time-dependent deformation (TDD) in small volumes was monitored using an alternating (AC) force technique and a Nanoindenter. The AC technique provides a continuous measure of contact stiffness during an indentation. By holding the force constant and monitoring the stiffness, the applied pressure and an effective strain rate were measured. Reasonable strain rate sensitivities were obtained for permanent indentations involving significant plastic strains. Time-dependent recovery due to residual strain energy is also reported. For reversible, elastic indentations, TDD was seen when the applied force was held constant. The deformation is attributed to atomic diffusion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 239: Symposium D – Thin Films: Stresses and Mechanical Properties III , 1991 , 325
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

1) Atkins, A.G., Silverio, A. and Tabor, D., J. Inst. Metals 94, 369.(1966).Google Scholar
2) P.M., and Ashby, M. F., Departmental Report CUED/C-Mats/TR 145, Engineering Department, Cambridge Univ., UK.Google Scholar
3) Brookes, C.A., Brookes, E.J., Howes, V.R., Roberts, S.G. and Waddington, C.P., J. Hard Mat. 1, 3 (1990).Google Scholar
4) Chu, S.H.G. and Li, J.C.M., J. Mat. Sci. 12, 2200 (1977).Google Scholar
5) Frost, H.J. and Ashby, M.F., “Deformation Mechanism Maps”, Pergamon Press, Oxford (1982).Google Scholar
6) Stone, D., LaFontaine, W.R., Alexopolous, P., Wu, T-W. and Li, C.Y., J. Mater. Res. 3, 141 (1988).CrossRefGoogle Scholar
7) Mayo, M.J. and Nix, W.D., Acta. Metall. 36, 2183 (1988).Google Scholar
8) Doerner, M.F. and Nix, W.D., J. Mater. Res. 1, 601 (1986).Google Scholar
9) Raffi-Tabor, H, Pethica, J B and Sutton, A P, Mat. Res. Soc. Symp. Proc, Fall 1991, to be published.Google Scholar
10) Johnson, K.L., “Contact Mechanics”, Cambridge University Press, Cambridge (1985).Google Scholar
11) Sneddon, I.M., Int. J. Eng. Sci. 1, 47 (1965).Google Scholar
12) Hertz, H., J. Reine und Angewondte Mathematik 22, 156 (1882).Google Scholar
13) King, R.B., Int. J. Solid Structures 22, 1657 (1987).Google Scholar
14) Pethica, J B and Oliver, W C, Mat. Res. Soc. Symp. Proc. 130. 13 (1989).Google Scholar
15) Nano Instruments, Inc., P.O. Box 14211, Knoxville, TN 37914.Google Scholar
16) Baker, S P and Nix, W D, Mat. Res. Soc. Symp. Proc, Fall 1991, to be published.Google Scholar