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Titolo:
Multiscale modelling of plastic flow localization in irradiated materials
Autore:
de la Rubia, TD; Zbib, HM; Khraishi, TA; Wirth, BD; Victoria, M; Caturia, MJ;
Indirizzi:
Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA Univ CalifLawrence Livermore Natl Lab Livermore CA USA 94550 A 94550 USA Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA Washington State Univ Pullman WA USA 99164 at Engn, Pullman, WA 99164 USA EPFL, CRPP, CH-5232 Villigen, Switzerland EPFL Villigen Switzerland CH-5232 L, CRPP, CH-5232 Villigen, Switzerland
Titolo Testata:
NATURE
fascicolo: 6798, volume: 406, anno: 2000,
pagine: 871 - 874
SICI:
0028-0836(20000824)406:6798<871:MMOPFL>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENERGY DISPLACEMENT CASCADES; MOLECULAR-DYNAMICS; COMPUTER-SIMULATION; INTERSTITIAL LOOPS; DEFECT PRODUCTION; SINGLE-CRYSTALS; METALS; DAMAGE; MICROSTRUCTURE; DISLOCATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: de la Rubia, TD Univ Calif Lawrence Livermore Natl Lab, 7000 E Ave,L-353, Livermore, CA 94550 USA Univ Calif Lawrence Livermore Natl Lab 7000 E Ave,L-353 Livermore CA USA 94550
Citazione:
T.D. de la Rubia et al., "Multiscale modelling of plastic flow localization in irradiated materials", NATURE, 406(6798), 2000, pp. 871-874

Abstract

The irradiation of metals by energetic particles causes significant degradation of the mechanical properties(1,2), 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 plants(3), and constrain the choice of materials for fusion-based alternative energy sources(4). Although these phenomena have been known for many years(1), 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 theremaining defect clusters.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 23:02:06