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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 USADepartment 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.

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