Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Migration kinetics of the self-interstitial atom and its clusters in bce Fe
Autore:
Soneda, N; de la Rubia, TD;
Indirizzi:
Cent Res Inst Elect Power Ind, Komae, Tokyo 2018511, Japan Cent Res Inst Elect Power Ind Komae Tokyo Japan 2018511 yo 2018511, Japan Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA Univ CalifLawrence Livermore Natl Lab Livermore CA USA 94550 A 94550 USA
Titolo Testata:
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS ANDMECHANICAL PROPERTIES
fascicolo: 2, volume: 81, anno: 2001,
pagine: 331 - 343
SICI:
1364-2804(200102)81:2<331:MKOTSA>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY SCATTERING; DISPLACEMENT CASCADES; COMPUTER-SIMULATION; MOLECULAR-DYNAMICS; DEFECT PRODUCTION; ALPHA-FE; METALS; IRON; IRRADIATION; MECHANISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Soneda, N Cent Res Inst Elect Power Ind, 2-11-1 Iwato Kita, Komae, Tokyo 2018511, Japan Cent Res Inst Elect Power Ind 2-11-1 Iwato Kita Komae Tokyo Japan 2018511
Citazione:
N. Soneda e T.D. de la Rubia, "Migration kinetics of the self-interstitial atom and its clusters in bce Fe", PHIL MAG A, 81(2), 2001, pp. 331-343

Abstract

Self-interstitial atoms (SIAs) and SIA clusters are produced in displacement cascades during irradiation of a material with high-energy particles. The migration kinetics of such defects are a critical factor in controlling microstructure evolution and the ensuing changes in mechanical properties. In this study, extensive molecular dynamics (MD) simulations were performed on the diffusion of the SIA and its clusters in bcc Fe. Diffusivities were calculated for various SIA cluster sizes. It was found that, although the diffusivity itself decreases as the SIA cluster size increases, their activation energy for migration is very small and does not increase with size, incontrast with previous assumptions. Based on previous results obtained by Wirth et al. and the current calculations, we study the mechanism of singleSIA diffusion by a kinetic Monte Carlo technique. The resulting model is consistent with experiments. An important conclusion of this study is that the 'effective' migration energy of the single SIA (0.17 eV in the present MD study) is smaller than the activation energy for stage I-E recovery. The proposed model explains all the details of the low temperature recovery stages, I-D and I-E, Of bcc Fe without the need to invoke the existence of twoindependent interstitial configurations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 11:31:07