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Titolo:
Temporal and spatial evolution of dislocation and void structures under cascade damage production
Autore:
Dubinko, VI;
Indirizzi:
Kharkov Phys & Technol Inst, UA-310108 Kharkov, Ukraine Kharkov Phys & Technol Inst Kharkov Ukraine UA-310108 8 Kharkov, Ukraine
Titolo Testata:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
fascicolo: 1-4, volume: 153, anno: 1999,
pagine: 116 - 121
SICI:
0168-583X(199906)153:1-4<116:TASEOD>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISPLACEMENT CASCADES; MOLECULAR-DYNAMICS; IRRADIATION; METALS; MICROSTRUCTURE; CU;
Keywords:
irradiation; cascades; void ordering; swelling saturation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Dubinko, VI Kharkov Phys & Technol Inst, Akad 1, UA-310108 Kharkov, Ukraine Kharkov Phys & Technol Inst Akad 1 Kharkov Ukraine UA-310108
Citazione:
V.I. Dubinko, "Temporal and spatial evolution of dislocation and void structures under cascade damage production", NUCL INST B, 153(1-4), 1999, pp. 116-121

Abstract

In this paper, the reaction kinetics of mobile self-interstitial loops (SIA-loops) with voids, network dislocations and grain boundaries is considered in the framework of the rate theory taking into account one-dimensional motion of SIA-loops and their elastic interaction with extended defects. Evolution of dislocation and void ensembles in time and space is shown to consist of three stages depending on the relationship between the void mean size and dislocation density. While voids are small, the production bias effect on the void growth rate is positive resulting in the enhanced swelling rate at the initial stage, in agreement with previous theories. At the secondstage, voids become a dominant sink for SIA-loops resulting in a negative effect of production bias on void swelling rate. At this stage, a spatiallyhomogeneous distribution of voids becomes unstable giving rise to the voidlattice formation via cooperation of one-dimensional (SIA-loops) and three-dimensional (point defect diffusion) mechanisms of interaction between voids. At the third stage, a saturation of the void growth and the network dislocation climb takes place resulting in a steady-state microstructure formation under irradiation. The expressions for the steady-state microstructural parameters are derived and compared with experimental observations. The comparison shows that such a behavior is characteristic of a majority of b.c.c metals were not only small SIA-clusters can be mobile but the larger clusters convert into glissile perfect SIA-loops that can glide along close-packed directions and can be annihilated by voids and other extended defects to which they are attracted. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 01/06/20 alle ore 08:00:45