Journal article
Multiscale modelling of plastic flow localization in irradiated materials
Nature (London), Vol.406(6798), pp.871-874
08/24/2000
Handle:
https://hdl.handle.net/2376/105223
PMID: 10972284
Abstract
The irradiation of metals by energetic particles causes significant degradation
of the mechanical properties, 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 plants, and constrain the choice of materials for fusion-based alternative
energy sources. Although these phenomena have been known for
many years, 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.
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Details
- Title
- Multiscale modelling of plastic flow localization in irradiated materials
- Creators
- Tomas Diaz de la Rubia - Lawrence Livermore National LaboratoryTariq A Khraishi - Washington State University, School of Mechanical & Materials EngineeringMax Victoria - EPFL-CRPP-Fusion Technology MaterialsMaria Jose Caturla - Lawrence Livermore National LaboratoryHussein M Zbib - Washington State University, School of Mechanical & Materials EngineeringBrian D Wirth - Lawrence Livermore National Laboratory
- Publication Details
- Nature (London), Vol.406(6798), pp.871-874
- Identifiers
- 99900546782201842
- Language
- English
- Resource Type
- Journal article