Abstract
Abstract Knoop indentation hardness measurements have been made, at room temperature, on (001) and (111) surfaces of cubic boron nitride crystals. Subsequent heat-treatment of the crystals, in air at temperatures of 900°C and above, caused a rapid expansion of the dislocated volume beneath the indentation and the formation of etched slip traces. Observations on the nature of anisotropy in hardness and the geometry of the slip traces have been used to identify {111} 〈110〉 as the active slip system in cubic boron nitride.
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