| Growth directions of microstructures in directional solidification of crystalline materials. | |
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MedLine Citation:
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PMID: 18763966 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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In directional solidification, as the solidification velocity increases, the growth direction of cells or dendrites rotates from the direction of the thermal gradient to that of a preferred cristalline orientation. Meanwhile, their morphology varies with important implications for microsegregation. Here, we experimentally document the growth directions of these microstructures in a succinonitrile alloy in the whole accessible range of directions, velocities, and spacings. For this, we use a thin sample made of a single crystal on which the direction of the thermal gradient can be changed. This allows a fine monitoring of the misorientation angle between thermal gradient and preferred crystalline orientation. Data analysis shows evidence of an internal symmetry which traces back to a scale invariance of growth directions with respect to a Péclet number. This enables the identification of the relationship between growth directions and relevant variables, in fair agreement with experiment. Noticeable variations of growth directions with misorientation angles are evidenced and linked to a single parameter. |
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Authors:
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J Deschamps; M Georgelin; A Pocheau |
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Publication Detail:
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Type: Journal Article Date: 2008-07-30 |
Journal Detail:
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Title: Physical review. E, Statistical, nonlinear, and soft matter physics Volume: 78 ISSN: 1539-3755 ISO Abbreviation: Phys Rev E Stat Nonlin Soft Matter Phys Publication Date: 2008 Jul |
Date Detail:
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Created Date: 2008-09-03 Completed Date: 2008-10-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101136452 Medline TA: Phys Rev E Stat Nonlin Soft Matter Phys Country: United States |
Other Details:
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Languages: eng Pagination: 011605 Citation Subset: - |
Affiliation:
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IRPHE, Aix-Marseille Universités, CNRS, 49 rue Joliot-Curie, BP 146, Technopôle de Château-Gombert, F-13384 Marseille, Cedex 13, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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