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Characterizing short-range vs. long-range spatial correlations in dislocation distributions / Juliette Chevy in Acta materialia, Vol. 58 N° 5 (Mars 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1837–1849 Titre : Characterizing short-range vs. long-range spatial correlations in dislocation distributions Type de document : texte imprimé Auteurs : Juliette Chevy, Auteur ; Claude Fressengeas, Auteur ; Mikhail Lebyodkin, Auteur Année de publication : 2011 Article en page(s) : pp. 1837–1849 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Dislocation  dynamics  Self-organization  Spatial  correlation  Hard  X-ray  diffraction Résumé : Hard X-ray diffraction experiments have provided evidence of a strongly heterogeneous distribution of dislocation densities along the axis of cylindrical ice single crystals oriented for basal slip in torsion creep. The dislocation arrangements showed a complex scale-invariant character, which was analyzed by means of statistical and multifractal techniques. A trend to decreasing autocorrelation of the dislocation distribution was observed as deformation proceeds. At low strain levels, long-range spatial correlations control the distribution, but short-range correlations in relation with cross-slip progressively prevail when strain increases. This trend was reproduced by a model based on field dislocation dynamics, a theory accounting for both long-range elastic interactions and short-range interactions through transport of dislocation densities. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008064 [article] Characterizing short-range vs. long-range spatial correlations in dislocation distributions [texte imprimé] / Juliette Chevy, Auteur ; Claude Fressengeas, Auteur ; Mikhail Lebyodkin, Auteur . - 2011 . - pp. 1837–1849. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1837–1849 Mots-clés : Dislocation  dynamics  Self-organization  Spatial  correlation  Hard  X-ray  diffraction Résumé : Hard X-ray diffraction experiments have provided evidence of a strongly heterogeneous distribution of dislocation densities along the axis of cylindrical ice single crystals oriented for basal slip in torsion creep. The dislocation arrangements showed a complex scale-invariant character, which was analyzed by means of statistical and multifractal techniques. A trend to decreasing autocorrelation of the dislocation distribution was observed as deformation proceeds. At low strain levels, long-range spatial correlations control the distribution, but short-range correlations in relation with cross-slip progressively prevail when strain increases. This trend was reproduced by a model based on field dislocation dynamics, a theory accounting for both long-range elastic interactions and short-range interactions through transport of dislocation densities. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008064