Anisotropy of grain boundaries in crystals: a new measurement technique applied to polar ice
PACS. 61.72.Mm – Grain and twin boundaries. Abstract. – To analyse a polycrystalline material which has undergone mechanical sollicitations, we quantify the deformation of grain boundaries. We investigate a pattern which records past deformations: a deep ice core, in Dome Concordia, Antarctica. Its...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
| Published: |
2003
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.305.5504 http://arxiv.org/pdf/cond-mat/0309081v1.pdf |
| Summary: | PACS. 61.72.Mm – Grain and twin boundaries. Abstract. – To analyse a polycrystalline material which has undergone mechanical sollicitations, we quantify the deformation of grain boundaries. We investigate a pattern which records past deformations: a deep ice core, in Dome Concordia, Antarctica. Its ice microstructure (grain boundaries) is a key feature useful to study ice evolution and to investigate climatic changes. Our method extracts quantitative physical information, such as the anisotropy and the local heterogeneity of the deformation. This leads to a re-examination of current models used in datation. The method also applies to extract quantitative geometrical information from other cellular patterns, ranging from metal processing and biological tissues to foams and granular matter. Motivations. – A picture contains a large amount of data, from which it is sometimes difficult to extract quantitative, physically relevant information. In this letter, we present a method to characterise a cellular pattern by measuring a geometrical quantity, the “texture tensor ” [1], using local spatial averages. We apply this analysis to the grain boundaries (the |
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