Role of scandium additions in primary silicon refinement of hypereutectic Al–20Si alloys
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Publication Details
Author list: Chokemorh P., Pandee P., Limmaneevichitr C.
Publisher: Taylor and Francis Group
Publication year: 2018
Journal: International Journal of Cast Metals Research (1364-0461)
Volume number: 31
Issue number: 5
Start page: 269
End page: 278
Number of pages: 10
ISSN: 1364-0461
eISSN: 1743-1336
Languages: English-Great Britain (EN-GB)
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Abstract
This study investigates the effect of Sc on the formation of primary silicon during the solidification of hypereutectic Al–20Si alloys. The evolution of the microstructure was studied using thermal analysis. The results show that the addition of 0·2 and 0·4 wt-% Sc suppresses the nucleation of primary silicon due to the formation of ScP particles instead of AlP particles. For large Sc additions, at the centre of the samples, the primary silicon has a star-shaped morphology with thin branches. The addition of Sc decreases the P refinement efficiency in hypereutectic Al–20Si alloys, which may be a result of the formation of a ScP phase. The results suggest that the addition of Sc poisons the nucleant particles of the primary and eutectic silicon. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
Keywords
Hypereutectic Al–Si, intermetallic, ScP
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