On the role of long-range internal stresses on grain nucleation during dynamic discontinuous recrystallization

The role of long-range elastic interactions in discontinuous dynamic recrystallization is assessed using a simple analytical model, taking into account dislocation pileup relaxation during embryo formation. Long-range dislocation pileup rearrangements following absorption of leading dislocations by a dislocation-free embryo provides an additional driving force that results in a drastic decrease of both nucleation critical radius and saddle point energy. A very sharp transition between a saddle point behavior and spontaneous grain nucleation is evidenced. The role of long-range internal stresses on grain nucleation during dynamic discontinuous recrystallization of ice, metals and minerals is shortly discussed.