Author： Nabarro F. R. N.
Publisher： Taylor & Francis Ltd
ISSN： 1478-6443
Source： Philosophical Magazine, Vol.86, Iss.25-26, 2006-09, pp. : 4173-4180
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Abstract
The theory by Stelmashenko et al. , De Guzman et al. and Nix and Gao of the size effect in microindentation is outlined and some implicit assumptions are discussed. By an algebraic rearrangement, the slope of the straight-line plot of the square of hardness against the reciprocal of the diameter or depth of an indentation acquires a value which is predictable and in order of magnitude in agreement with experiment. The corresponding scale length, of order 1 micron in copper, is thus a real physical property of the material, although it is not visible in the undeformed material. In the recent experiments of Motz et al. it is observed directly. The two-phase `hard metal' WC-Co has a microscopic intrinsic scale length, accordingly, the plot is no longer linear.
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