  We propose mechanism describing an acoustic emission by growing microcracks
in the material under external cycled load. We use the theoretical approach
based on Huygens principle for elastic solid con-tinuum with an account for
dislocation creep in the zone of abrasive action. We show that the acoustic
emission is anisotropic and its main direction depends not only on the
effective length of microcrack but also on dynamics of dislocation structure
and on diffusion processes in Kottrell zone which give rise to microcracks.
