Precipitate stability and morphology in irradiation environments |
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Authors: | P Krasnochtchekov R S Averback P Bellon |
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Affiliation: | (1) University of Illinois in Urbana-Champaign, Urbana, USA;(2) 1304 W. Green Street, Urbana, IL 61801, USA |
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Abstract: | A solid under irradiation constitutes a nonequilibrium dynamical system, and therefore the modeling of phase stability in
such systems requires a kinetic approach. This paper presents some recent advances in the atomistic modeling of precipitation
under irradiation, using kinetic Monte Carlo simulations. It illustrates that vacancy-assisted and thermodynamically driven
phase separation, in competition with forced atomic mixing promoted by nuclear collisions, can lead to three very different
outcomes: dissolution of pre-existing precipitates, the formation of compositional patterns at the nanoscale, or macroscopic
decomposition. Interstitial transport, on the other hand, when coupled with solute fluxes, can induce the precipitation of
mushy precipitates, even in ideal alloy systems. These diverse phase evolutions are shown to be rationalized by continuum
modeling. |
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