The surface strengths of these halides in He and N atmospheres, as compared with those in air and toluene, were investigated by using indentation and scratching techniques. The relative mobilities of edge and screw dislocations in dislocation indentation rosettes were estimated. It was found that the mobilities were greatest in He, and decreased in the order of: toluene, air, N. The results were analyzed in terms of dislocation dynamic diffusion effects. These involved the penetration of atoms or molecules of the medium along the centers of moving dislocations in the indentations. This phenomenon affected the hardness, due to variations in the dislocation multiplication rate when indentation rosettes were produced in various media.

O.V.Klyavin: Fizika Tverdogo Tela, 1996, 38[4], 1172-81 (Physics of the Solid State, 1996, 38[4], 649-53)