A description of the acoustic emission due to dislocation annihilation during the plastic deformation of crystals was presented. The annihilation of dislocation kink–antikink pairs during Frank–Read source operation was investigated within the framework of a dynamic model which described the interaction between dislocations and acoustic waves. The model involved a d’Alembert wave equation which was non-linearly coupled to a sine-Gordon equation. The acoustic emission due to annihilating dislocation kinks was considered, and the emitted energy and the power spectral density of the emitted waves were calculated. It was shown that the lifetime of the generating event was inversely proportional to the square of the applied stress; in agreement with existing measurements. The stress which corresponded to the maximum emission was calculated, and was also found to be in agreement with experimental data. The results supported the theory that the annihilation of dislocations could also be a source of considerable acoustic emission during plastic deformation. The present model also provided better physical insights into the emission mechanisms which were involved.

Acoustic Emission Induced by Dislocation Annihilation During Plastic Deformation of Crystals. B.Polyzos, E.Douka, A.Trochidis: Journal of Applied Physics, 2001, 89[4], 2124-9