Abstract
The elastic field and stress concentration around a second phase particle have been discussed in the unrelaxed and relaxed states. The relaxed state is defined as that minimizing the free energy. The diffusion along the matrix-particle interface is responsible for the relaxation to occur. It has been shown that a second phase particle under hydrostatic stress in the relaxed state is elastically equivalent to an incoherent particle. It has been pointed out that a flat shaped particle behaves, as if it were a shear crack, in the relaxed state. The kinetics of the interface diffusional relaxation has been formulated for spherical and cylindrical particles. The relaxation time for the process is proportional to the cubic power of the particle size.
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