Effect of magnetic field on the dislocation structure and mechanical properties of alkali halide crystals deformed by ultrasound
The dislocation structure and mechanical properties of LiF and NaCl crystals under joint action of magnetic field and ultrasound in the range of longitudinal strain amplitudes corresponding to dislocation multiplication have been investigated. Ultrasonic deformation was implemented in a piezoelectric oscillator at a frequency of 80 kHz. It is established that the presence of a magnetic field facilitates cross slip; initiates displacement of block boundaries; and leads to the formation of labyrinth structures (characteristic of high-temperature loading), which strengthen the crystal.