A mechanism was proposed for the motion of dislocations through incoherent second-phase particles, under the action of high local stresses which accumulated near to particles during plastic shear of the matrix. The critical stress which was necessary for the penetration of a screw component of an Orowan loop into a hard particle was calculated under the assumption of a random misorientation between the slip planes of the particle and the matrix. The cases of quasi-uniform and accelerated dislocation motion under the influence of shear stresses, and of interaction of the moving dislocations with incoherent particles, were considered. The fraction of incoherent particles that was plastically deformed together with the matrix was estimated.

Diffusion-Induced Changes in the Shape of High-Strength Particles due to the Interaction of Dislocations with Interphase Boundaries. L.E.Popov, T.A.Kovalevskaya, O.A.Sergeeva: Physics of Metals and Metallography, 1997, 83[4], 374-7