It has been shown that the impurity type and indentation time affect appreciable on dislocation rosettes of NaCl single crystals. It was established that the growth of indentation diagonal was not practically followed by the increase of the dislocation zone size. This phenomenon connected with the cross slip processes, which are perhaps more intensive for prolonged indentation time and high temperatures. The assumption is made that the two mechanisms of responsible for indentation formation the movement of dislocations and their multiplication by the cross slip.
A correlation between the evolution of the electrical processes and the kinetics of plastic deformation during microindentation is found. The investigation is performed on a (001) cleavage plane of LiF single crystals. The identor penetration depth and electrical signals are simultaneously registered. The dislocation patterns around the impressions are revealed by the etch pit technique. The evolution of the plastic deformation and of the electric polarization of the crystals occurs in two stages. A time delay of the electrical signal relative to the beginning of the indentation process is observed. Previous plastic deformation results in a sharp decrease of the dipole moment, due to the identation, and a shorter delay time of the electric signal.
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