Nonequilibrium Roughening and Faceting of Interfaces in Driven Alloys

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Abstract
We consider the case of crystalline alloys submitted to an external forcing that produces ballistic atom exchanges. The dynamical stability of precipitate-matrix interfaces is studied by kinetic atomistic Monte Carlo simulations. At steady state, sharp precipitate-matrix interfaces can exhibit kinetic roughening, while diffuse interfaces may develop a surprising kinetic faceting. The latter results in nonequilibrium faceted shapes for precipitates. The possible implications for materials subjected to radiation fields or processed by ion beams are discussed.