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Article Dans Une Revue Philosophical Magazine Année : 2015

Channel formation and multiplication in irradiated FCC metals: a 3D dislocation dynamics investigation

Résumé

Our goal in this work is to investigate post-irradiation tensile deformation of FCC grains using 3D dislocation dynamics (DD) simulations. We focus on irradiation dose conditions where plastic strain is expected to localize into defect-depleted channels. Two DD simulation types are used for treating distinct space and time scale effects. Type-I simulations describe the formation of single dislocation channels at a high resolution (nm). Here, the irradiation-induced defects are described explicitly, in the form of prismatic dislocation loops. Type-II simulations are used to describe the channel multiplication process itself, i.e. at the grain scale (mu m). This time, the irradiation-induced defects are treated in a simplified way, taking advantage of Type-I simulation results. Simulated channel spacing is found to depend on three main input parameters: the dose-dependent stress level, grain size and critical cross-slip stress. The results are rationalized in terms of a micro-model based on simple, finite-sized dislocation arrangements. The model is further validated by comparison with available experimental evidence.

Domaines

Matériaux
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Dates et versions

hal-01216766 , version 1 (16-10-2015)

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Citer

K. Gururaj, C. Robertson, M. Fivel. Channel formation and multiplication in irradiated FCC metals: a 3D dislocation dynamics investigation. Philosophical Magazine, 2015, 95 (12), pp.1368-1389. ⟨10.1080/14786435.2015.1029560⟩. ⟨hal-01216766⟩
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