Dislocation multiplication in alkali halide crystals exposed to ultrasonic waves. The original stage

The original stage of plastic deformation in insonated alkali halide crystals (ahc) is presented. Samples of LiF, NaCl, KBr, KCl are strained in a double-resonance oscillator under frequencies from 30 to 180 kHz. The dislocation structure is revealed by etch pit and electrolytic decoration methods. It is found, that the original stage of a plastic flow in insonated ahc may be controlled by multiplication of the dislocations belonging to the subgrain boundaries. Possible models of dislocation sources situated in the subgrain boundaries are discussed.