Abstract
The effect of pileup on hardness measurements is investigated by nanoindentation on a copper sample subjected to Surface Mechanical Attrition Treatment (SMAT). Pileup height was found to increase linearly with an increase in the maximum indentation load and decrease exponentially with an increase in distance from the SMAT surface. Pileup is shown to have a significant effect on hardness values obtained through nanoindentation. The linear relationship of pileup height with indentation load has significant consequences, such as violation of the self-symmetry assumption. Considering these consequences a modification to the standard hardness measurement is proposed.
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