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Characterizing short-range vs. long-range spatial correlations in dislocation distributions
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DOI：10.1016/j.actamat.2009.11.027.png)
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摘要
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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. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword:
Dislocation dynamics
Self-organization
Spatial correlation
Hard X-ray diffraction
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期刊
IF:
9.3
论文数:
2.0W
被引数:
12.9W
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Rearrangement of dislocation structures in the aging of ice single crystals.png)
ACTA MATERIALIA
ACTA MATERIALIAIF9.3
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