Diffusion-controlled phase growth on dislocations

Details Diffusion-controlled phase growth on dislocations Diffusion-controlled phase growth on dislocations

2009-02-11

arxiv.org/abs/0902.1841v1

Physics

Condensed Matter

Materials Science

10 pages, 4 figures, a revised version of the paper presented in MS&T'08, October 5-9, 2008, Pittsburgh

Scientific paper

We treat the problem of diffusion of solute atoms around screw dislocations. In particular, we express and solve the diffusion equation, in radial symmetry, in an elastic field of a screw dislocation subject to the flux conservation boundary condition at the interface of a new phase. We consider an incoherent second-phase precipitate growing under the action of the stress field of a screw dislocation. The second-phase growth rate as a function of the supersaturation and a strain energy parameter is evaluated in spatial dimensions d=2 and d=3. Our calculations show that an increase in the amplitude of dislocation force, e.g. the magnitude of the Burgers vector, enhances the second-phase growth in an alloy. Moreover, a relationship linking the supersaturation to the precipitate size in the presence of the elastic field of dislocation is calculated.

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