Journal ArticleDOI
Multiscale modelling of plastic flow localization in irradiated materials
Tomas Diaz de la Rubia,Hussein M. Zbib,Tariq Khraishi,Brian D. Wirth,M. Victoria,Maria Jose Caturla +5 more
TLDR
Three-dimensional multiscale simulations of irradiated metals are used to reveal the mechanisms underlying plastic flow localization in defect-free channels and 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.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.read more
Citations
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Journal ArticleDOI
Efficient annealing of radiation damage near grain boundaries via interstitial emission.
TL;DR: Simulations show that grain boundaries in copper can act as sinks for radiation-induced defects, and find thatgrain boundaries have a surprising “loading-unloading” effect.
Journal ArticleDOI
Three-dimensional X-ray structural microscopy with submicrometre resolution
TL;DR: A three-dimensional X-ray microscopy technique that uses polychromatic synchrotron X-rays to probe local crystal structure, orientation and strain tensors with submicrometre spatial resolution is described, applicable to single-crystal, polycrystalline, composite and functionally graded materials.
Journal ArticleDOI
Multiscale modelling of defect kinetics in irradiated iron
TL;DR: In this article, the authors combine ab initio and kinetic Monte Carlo methods to reproduce the abrupt resistivity changes observed upon annealing at increasing temperatures after electron irradiation in α-iron.
Journal ArticleDOI
Stability and Mobility of Mono- and Di-Interstitials in α-Fe
TL;DR: The <110> dumbbell is confirmed to be the most stable SIA configuration, 0.7 eV below the <111 > dumbbell, and the lowest-energy migration path corresponds to a nearest-neighbor translation-rotation jump with a barrier of 0.34 eV.
Journal ArticleDOI
Mechanism of Radiation Damage Reduction in Equiatomic Multicomponent Single Phase Alloys
F. Granberg,Kai Nordlund,Mohammad W. Ullah,Ke Jin,Chenyang Lu,Hongbin Bei,Lumin Wang,Flyura Djurabekova,William J. Weber,Yanwen Zhang +9 more
TL;DR: A combination of experimental and modeling efforts reveals a substantial reduction of damage accumulation under prolonged irradiation in single-phase NiFe and NiCoCr alloys compared to elemental Ni, explained by reduced dislocation mobility, which leads to slower growth of large dislocation structures.
References
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Journal ArticleDOI
Recent progress in understanding reactor pressure vessel steel embrittlement
G.R. Odette,G.E. Lucas +1 more
TL;DR: In this paper, the basic mechanisms of irradiation embrittlement in reactor pressure vessel steels are reviewed and a detailed identity and etiology of the matrix defects and manganese-nickel-rich phases are discussed.
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The microstructure and associated tensile properties of irradiated fcc and bcc metals
TL;DR: In this article, the differences and similarities of behaviour between fee and bcc metals after irradiation have been investigated, and it is shown that a dense population of defect clusters (up to 10(22)-10(24) m(-3)) develops, the type of cluster formed depending apparently on the stacking fault energy.
Journal ArticleDOI
Defect production, annealing kinetics and damage evolution in α-Fe: An atomic-scale computer simulation
N. Soneda,T. Diaz de la Rubia +1 more
TL;DR: In this paper, a combination of molecular dynamics and kinetic Monte Carlo (KMC) simulations is used to calculate the damage production efficiency and the fraction of freely migrating defects in α-Fe at 600 K.