Diffusion from a constant source along nonequilibrium dislocation pipes

Abstract

We propose new theoretical description of diffusion features along nonequilibrium dislocation pipes. The excess energy of nonequilibrium dislocation pipes is introduced. The effective diffusion coefficient in nonequilibrium dislocation is calculated and analyzed taking into account the relaxation processes during diffusion annealing. The equation of nonequilibrium diffusion from a constant source in dislocation pipes is derived. The analytical solution of formulated equation describing the diffusant concentration in dislocation pipe is found. The diffusant concentration and the amount of diffusant at a fixed depth increase with an increase in nonequilibrium dislocation excess energy. We observe the maximum of time dependence of diffusant concentration caused by an increase in nonequilibrium dislocation excess energy and relaxation processes during diffusion annealing.