Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 487, Issue 1-2, Pages 163-172Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.08.032
Keywords
Al-Si alloy; Directional solidification; Grain refinement; Electromagnetic stirring; Travelling magnetic field (TMF)
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 609]
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The present study concerns the directional solidification of grain-refined and non-refined Al-7 wt.% Si alloys under the influence of a travelling magnetic field (TMF). Upwards and downwards travelling fields have been applied to provide a forced convection within the solidifying melt. The formation of a fine equiaxed structure is favoured by both the addition of grain refining AITi5B1-particles and electromagnetic stirring as well, whereas the addition of grain refiners into the melt appears to be more efficient for achieving a reduction of the mean grain size. A minimum grain size has been observed of the electromagnetic agitation of a grain-refined alloy. A melt stirring by a sufficiently high magnetic field provides a homogeneous grain size distribution in the sample volume, but, gives rise to the formation of segregation zones. (C) 2009 Elsevier B.V. All rights reserved.
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