Deformation under nano/microindentation of LiF, MgO, Si monocrystals stipulated as support materials for Cu/substrate structures

Abstract

This work is focused on the specific behaviour of LiF, MgO, Si single crystals when they are put to test by the local nano and micro loading, because they are stipulated as support materials in Cu/substrate structures. These crystals belong to cubic syngony with ionic, ionic-covalent and covalent chemical bond type, respectively, and are possessed of very different dislocation mobility. It is expected that these factors will very hard influence on the mechanical properties of the Cu/substrate composite structures. That is way, the microhardness and specific deformation zones around nano and microindentations created under concentration load action are considered in the paper. It is shown that these monocrystals essentially differ from each other in the hardness and form various relief and dislocation rosettes around indentations.