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Melt flow in a mushy zone - barrier effect of intermetallic phases

Steinbach, S. and Ratke, L. (2009) Melt flow in a mushy zone - barrier effect of intermetallic phases. International Journal of Cast Metals Research, 22 (1-4). Taylor & Francis. doi: 10.1179/136404609X367920.

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Official URL: http://www.ingentaconnect.com/content/maney/ijcmr/2009/00000022/F0040001/art00072


Iron and manganese are common impurity elements in cast aluminium alloys, especially in secondary aluminium. During casting Fe/Mn-containing intermetallics are formed between the aluminium dendrites, which cause porosity and shrinkage defects. In this paper an experimental study on the influence of controlled convection during solidification on the spatial arrangement of intermetallic phases and their interaction with the dendritic microstructure in Al-7Si-1Fe (AlSiFe) and Al-7Si-1Mn (AlSiMn) alloys (wt-%) is presented. Forced convection is induced by a rotating magnetic field. The alloys are solidified directionally over a range of constant solidification velocities (0·015-0·18 mm/s) at a constant temperature gradient G of 3 K/mm. The results indicate that the primary spacing and the secondary dendrite arm spacing are affected by the presence of Fe and Mn intermetallic phases. In samples solidified under forced convections the primary dendrite arm spacing did not depend on the solidification velocity and no obvious fluid flow effect on the secondary spacing could be detected. These observations are in contrast to Fe and Mn free alloys. It seems that the intermetallics act as a barrier for the flow into the mushy zone.

Item URL in elib:https://elib.dlr.de/59740/
Document Type:Article
Title:Melt flow in a mushy zone - barrier effect of intermetallic phases
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:August 2009
Journal or Publication Title:International Journal of Cast Metals Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:Taylor & Francis
Keywords:intermetallic phases, mushy zone, flow effects, solidification
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Ratke, Prof. Lorenz
Deposited On:20 Aug 2009 14:39
Last Modified:06 Sep 2019 15:19

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