Multiscale modelling of plastic flow localization in irradiated materials

Tomas Diaz de la Rubia (), Hussein M. Zbib, Tariq A. Khraishi, Brian D. Wirth, Max Victoria and Maria Jose Caturla
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Tomas Diaz de la Rubia: Lawrence Livermore National Laboratory
Hussein M. Zbib: Washington State University, School of Mechanical & Materials Engineering
Tariq A. Khraishi: Washington State University, School of Mechanical & Materials Engineering
Brian D. Wirth: Lawrence Livermore National Laboratory
Max Victoria: EPFL-CRPP-Fusion Technology Materials
Maria Jose Caturla: Lawrence Livermore National Laboratory

Nature, 2000, vol. 406, issue 6798, 871-874

Abstract: Abstract The irradiation of metals by energetic particles causes significant degradation of the mechanical properties1,2, most notably an increased yield stress and decreased ductility, often accompanied by plastic flow localization. Such effects limit the lifetime of pressure vessels in nuclear power plants3, and constrain the choice of materials for fusion-based alternative energy sources4. Although these phenomena have been known for many years1, the underlying fundamental mechanisms and their relation to the irradiation field have not been clearly demonstrated. Here we use three-dimensional multiscale simulations of irradiated metals to reveal the mechanisms underlying plastic flow localization in defect-free channels. We observe dislocation pinning by irradiation-induced clusters of defects, subsequent unpinning as defects are absorbed by the dislocations, and cross-slip of the latter as the stress is increased. The width of the plastic flow channels is limited by the interaction among opposing dislocation dipole segments and the remaining defect clusters.

Date: 2000
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DOI: 10.1038/35022544

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