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The Correlation of Indentation Size Effect Experiments with Pyramidal and Spherical Indenters

Published online by Cambridge University Press:  21 March 2011

J. G. Swadener ,
E. P. George  and
G. M. Pharr
J. G. Swadener
Affiliation:
Los Alamos National Laboratory, MST-8 MS-G755, Los Alamos, NM 87545, USA
E. P. George
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
G. M. Pharr
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996 USA
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Abstract

Experiments were conducted in annealed iridium using pyramidal and spherical indenters over a wide range of load. For a Berkovich pyramidal indenter, the hardness increased with decreasing depth of penetration. However, for spherical indenters, hardness increased with decreasing sphere radius. Based on the number of geometrically necessary dislocations generated during indentation, a theory that takes into account the work hardening differences between pyramidal and spherical indenters is developed to correlate the indentation size effects measured with the two indenters. The experimental results verify the theoretical correlation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 695: Symposium L – Thin Films: Stresses and Mechanical Properties IX , 2001 , L11.5.1
Copyright
Copyright © Materials Research Society 2002

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References

REFERENCES

1. Mott, B. W., Micro-indentation Hardness Testing. (Butterworths, 1956) pp. 45–139.Google Scholar
2. Stelmashenko, N. A., Walls, M. G., Brown, L. M and Milman, Y. V., Acta Metall. Mater. 41, 2855 (1993).Google Scholar
3. Guzman, M. S. De, Neubauer, G., Flinn, P. and Nix, W. D., Mater. Res. Soc. Symp. Proc. 308, 613 (1993).Google Scholar
4. Ma, Q. and Clark, D. R.. J. Mater. Res. 10, 853 (1995).Google Scholar
5. Ashby, M. F., “The deformation of plastically non-homogenous alloys,” Strengthening Methods in Crystals, ed. Kelly, A and Nicholson, R. B., (Applied Science Publishers, Ltd., 1971) pp. 137–192.Google Scholar
6. Nye, J. F., Acta Metall. 1, 153 (1953).Google Scholar
7. Nix, W. D. and Gao, H., J. Mech. Phys. Solids. 46, 411 (1998).Google Scholar
8. Poole, W. J., Ashby, M. F. and Fleck, N. A., Scripta Mater. 34, 559 (1996).Google Scholar
9. Lim, Y. Y. and Chaudhri, M. M,. Phil. Mag A. 79, 2979 (1999).Google Scholar
10. Swadener, J. G., George, E. P. and Pharr, G. M., J. Mech. Phys. Solids 50, (2002) (in press).Google Scholar
11. Arsenlis, A. and Parks, D. M., Acta Mater. 47, 1597 (1999).Google Scholar
12. Johnson, K. L., J. Mech. Phys. Solids 18, 115 (1970).Google Scholar
13. Oliver, W. C. and Pharr, G. M., J. Mater. Res. 7, 1564 (1992).Google Scholar
14. Field, J. S. and Swain, M. V., J. Mater. Res. 8, 297 (1993).Google Scholar
15. Wiedersich, H., J. Metals. 16, 425 (1964).Google Scholar