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Article Dans Une Revue Physical Review Letters Année : 2023

Convection-Induced Compositional Patterning at Grain Boundaries in Irradiated Alloys

Résumé

We consider the stability of precipitates formed at grain boundaries (GBs) by radiation-induced segregation in dilute alloys subjected to irradiation. The effects of grain size and misorientation of symmetric-tilt GBs are quantified using phase field modeling. A novel regime is identified where, at long times, GBs are decorated by precipitate patterns that resist coarsening. Maps of the chemical Péclet number indicate that arrested coarsening takes place when solute advection dominates over thermal diffusion right up to the precipitate-matrix interface, preventing interfacial local equilibrium and overriding capillary effects. This contrasts with liquid-solid mixtures where convection always accelerates coarsening.

Domaines

Matériaux

Dates et versions

hal-04361078 , version 1 (22-12-2023)

Identifiants

Citer

G. F. Bouobda Moladje, R. S. Averback, P. Bellon, Ludovic Thuinet. Convection-Induced Compositional Patterning at Grain Boundaries in Irradiated Alloys. Physical Review Letters, 2023, Physical Review Letters, 131 (5), ⟨10.1103/physrevlett.131.056201⟩. ⟨hal-04361078⟩
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