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Experimental Study of Radial Segregation Caused by Weak Convection
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.ORCID iD: 0000-0002-3622-4247
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2005 (English)In: Microgravity, science and technology, ISSN 0938-0108, E-ISSN 1875-0494, Vol. 15, no 1, 35-39 p.Article in journal (Refereed) Published
Abstract [en]

Under conditions of weak convection in the liquid during metal solidification and crystal growth, large chemical inhomogeneities can occur due to insufficient mixing of the melt. In this project a series of experiments with increasing melt flow, driven by thermo-capillary forces, have been performed in a Get Away Special flight. The level of convection was evaluated quantitatively from analysis of axial segregation profiles. As expected a significantly stronger radial segregation has occurred in the space grown material compared to ground based reference experiments. It was also found that there was a shift of the position of maximum concentration when the flow was increased. Unexpected axial solute maxima were also revealed in the space samples. A comparison was made to numerical simulations, and good correlations were found to first order effects.

Place, publisher, year, edition, pages
2005. Vol. 15, no 1, 35-39 p.
Keyword [en]
Crystal growth, Microgravity, Convection, Segregation
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:miun:diva-1540DOI: 10.1007/BF02945942Local ID: 442OAI: oai:DiVA.org:miun-1540DiVA: diva2:26572
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2012-02-16Bibliographically approved

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Carlberg, Torbjörn
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