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Abstract
Some comparisons are made between the scratch hardness (Hs), as determined by the width of a groove formed under conditions of plastic deformation, and indentation hardness (H) of crystalline materials. It is shown that the Hs/H ratio is dependent on the ‘effective’ strain developed beneath the indenter. or slider, the homologous temperature and the crystallographic characteristics of the solid. The nature of anisotropy in cubic single crystals, now established for both indentation and scratch processes, is briefly compared and contrasted. It is shown how these measurements may be used to identify the operative slip systems in a given crystal.