Composition Patterning in Systems Driven by Competing Dynamics

Details Composition Patterning in Systems Driven by Competing Dynamics Composition Patterning in Systems Driven by Competing Dynamics

1999-10-26

arxiv.org/abs/cond-mat/9910435v1

Physics

Condensed Matter

Materials Science

Submitted to Phys. Rev. Lett

Scientific paper

We study an alloy system where short-ranged, thermally-driven diffusion competes with externally imposed, finite-ranged, athermal atomic exchanges, as is the case in alloys under irradiation. Using a Cahn-Hilliard-type approach, we show that when the range of these exchanges exceeds a critical value, labyrinthine concentration patterns at a mesoscopic scale can be stabilized. Furthermore, these steady-state patterns appear only for a window of the frequency of forced exchanges. Our results suggest that ion beams may provide a novel route to stabilize and tune the size of nanoscale structural features in materials.

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