Microstructural features of as-cast A356 alloy inoculated with Sr, Sb modifiers and Al–Ti–C grain refiner simultaneously

This article focuses on the microstructural refinement of as-cast A356 alloy, obtained by melt inoculation of the same. The inoculants used are Sr (modifier), Sb (modifier) and Al–Ti–C (grain refiner). Microstructural characterization of A356 alloy reveals that the Secondary Dendritic Arm Spacing (S...

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Bibliographic Details
Published in:Materials letters 2008-01, Vol.62 (2), p.273-275
Main Authors: Prasada Rao, A.K., Das, K., Murty, B.S., Chakraborty, M.
Format: Article
Language:English
Subjects:
Al–Si alloy
Grain refinement
Microstructure
Modification
Solidification
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Summary:This article focuses on the microstructural refinement of as-cast A356 alloy, obtained by melt inoculation of the same. The inoculants used are Sr (modifier), Sb (modifier) and Al–Ti–C (grain refiner). Microstructural characterization of A356 alloy reveals that the Secondary Dendritic Arm Spacing (SDAS) of α-Al dendrites and size/morphology of eutectic silicon decrease by treating the melt with pre-defined amounts of Sr, Sb and Al–5Ti–2C grain refiner. Microstructure of the inoculated as-cast A356 alloy shows that, modified eutectic–silicon exhibits fine fibrous morphology at shorter melt holding, while the same exhibits fine lamellar morphology on longer melt holding.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2007.05.020