It has been shown that a major role in changes of structural and micromechanical properties in LiF crystals caused by swift ions is assigned to formation of prismatic dislocation loops. It has been found that dislocation seedlings are formed already in individual ion tracks but intense formation of a dislocation structure occurs in the stage of track overlapping. In LiF a mosaic-type nanostructure oriented in the direction of the ion beam has been obtained by irradiation with energetic heavy ions (U, Au, Kr, Xe). The prerequisites for its formation have been determined. It has been show that irradiation with high doses leads to change in the mechanism of plastic deformation – from dislocation glide to shear banding. Swift ion caused effects in MgO as a radiation resistant and application oriented material have been studied. A co-participation of elastic collisions and electronic excitations in modification of micromechanical properties has been observed.
Key words: LiF, MgO, nanoindentation, swift ions, dislocations
