Ratke, Lorenz und Steinbach, Sonja (2007) Convective coarsening of secondary dendrite arms. In: Solidification Processing, Seiten 14-17. Department of Engineering Materials, University of Sheffield, Great Britain. 5th Decennial International Conference on Solidification Processing, 2007-07-23 - 2007-07-25, Sheffield, UK. ISBN 0-9522507-4-8.
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Kurzfassung
Coarsening of secondary dendrite arms in binary and multi-component alloys has been investigated theoretically and experimentally since decades and it generally is accepted that the secondary arms coarsen as the cube root of solidification time. Recent experimental investigation with AlSi, AlSiMg and AlSiCu alloys using gentle magnetic stirring in directional solidification experiments show that the coarsening kinetics are changed. Instead of a cube root relation it is observed that the secondary arms coarsen as the square root of solidification time. This paper describes a theoretical model for the secondary arm spacing based on an Ostwald ripening model with convective mass transport. The model predicts a coarsening in accordance with the experiments and correctly predicts increasing stirring magnitude accelerates coarsening. It also makes predictions on the effect of the permeability of the mush on the coarsening rate factor.
elib-URL des Eintrags: | https://elib.dlr.de/50343/ | ||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag, Paper) | ||||||||||||
Titel: | Convective coarsening of secondary dendrite arms | ||||||||||||
Autoren: |
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Datum: | Juli 2007 | ||||||||||||
Erschienen in: | Solidification Processing | ||||||||||||
Referierte Publikation: | Ja | ||||||||||||
Open Access: | Nein | ||||||||||||
Gold Open Access: | Nein | ||||||||||||
In SCOPUS: | Nein | ||||||||||||
In ISI Web of Science: | Nein | ||||||||||||
Seitenbereich: | Seiten 14-17 | ||||||||||||
Herausgeber: |
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Verlag: | Department of Engineering Materials, University of Sheffield, Great Britain | ||||||||||||
Name der Reihe: | Proceedings of the 5th Decennial International Conference on Solidification Processing | ||||||||||||
ISBN: | 0-9522507-4-8 | ||||||||||||
Status: | veröffentlicht | ||||||||||||
Stichwörter: | secondary dendrite arms, dendrite arm coarsening, convection effects | ||||||||||||
Veranstaltungstitel: | 5th Decennial International Conference on Solidification Processing | ||||||||||||
Veranstaltungsort: | Sheffield, UK | ||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||
Veranstaltungsbeginn: | 23 Juli 2007 | ||||||||||||
Veranstaltungsende: | 25 Juli 2007 | ||||||||||||
Veranstalter : | Howard Jones | ||||||||||||
HGF - Forschungsbereich: | Verkehr und Weltraum (alt) | ||||||||||||
HGF - Programm: | Weltraum (alt) | ||||||||||||
HGF - Programmthema: | W FR - Forschung unter Weltraumbedingungen (alt) | ||||||||||||
DLR - Schwerpunkt: | Weltraum | ||||||||||||
DLR - Forschungsgebiet: | W FR - Forschung unter Weltraumbedingungen | ||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | W - Vorhaben Materialforschung unter Mikro-g (alt) | ||||||||||||
Standort: | Köln-Porz | ||||||||||||
Institute & Einrichtungen: | Institut für Materialphysik im Weltraum > Institut für Raumsimulation > Zentrum für die Erstarrung unterkühlter Schmelzen (ZEUS) | ||||||||||||
Hinterlegt von: | Steinbach, Dr.rer.nat. Sonja | ||||||||||||
Hinterlegt am: | 31 Jul 2007 | ||||||||||||
Letzte Änderung: | 24 Apr 2024 19:13 |
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