Dislocation structure of КСL crystals deformed by ultrasound

The dislocation structure which occurs when ultrasound acts in crystals of KCl was investigated by the composite piezoelectric oscillator method at frequencies of 40-200 kHz with a relative deformation amplitude of ~$10^{-4}$. A difference was found in the development of the plastic deformation process over the frequency range investigated. An increase in the dynamic yield point was observed as the frequency was increased.