| Titre : | Characterizing short-range vs. long-range spatial correlations in dislocation distributions (2011) |
| Auteurs : | Juliette Chevy, Auteur ; Claude Fressengeas, Auteur ; Mikhail Lebyodkin, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 5, Mars 2010) |
| Article en page(s) : | pp. 1837–1849 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | 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 |
