Abstract
The character of deformation and damage to topocomposites upon instrumental indentation has been investigated. A topocomposite is considered as a layered system consisting of a thin hard coating coherently bound with a substrate made of a compliant solid material. Studies have been performed for a topocomposite consisting of a titanium nitride coating applied by means of magnetron sputtering in vacuum onto an aluminum alloy substrate. By comparing the energy balance of the model and experimental indentation diagrams, the amount of work done in deforming the layered system, in the interfacial separation at the coating-substrate interface, and in the formation of through-the-thickness annular cracks in the coating is assessed. The results of studies can be used for a qualitative assessment of the serviceability of functional surfaces for the machine parts hardened with coatings.
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