MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Formation of Primary Silicon during Cooling and Solidification of Al-20%Si Alloy
William John KyffinWilliam Mark RainforthHoward Jones
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2001 Volume 42 Issue 10 Pages 2098-2101

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Abstract

The relationship between the cooling curve and formation of primary silicon from the melt has been investigated for Al–20%Si alloy in the uninoculated state and when prior-treated with a phosphorus-bearing inoculant. The results suggest that coarse branched silicon forms from an uninoculated melt at sub-liquidus temperatures well above the primary silicon arrest temperature and that increasingly effective inoculation both reduces intensity of the arrest and shifts it to higher temperature eventually eliminating it completely in favour of a sharp reduction in slope of the cooling curve at or just below the liquidus temperature. It is proposed that this could be used as a simple diagnostic test for efficiency of refinement of primary silicon by inoculant additions under specified conditions.

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© 2001 The Japan Institute of Metals and Materials
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