Abstract
Among the structural light weight materials, Al-Si alloys can be the most widely used Al-alloys for aerospace and automotive applications. Our recent experiments using Ba additions of 1-3wt% into the melt of hypo- and hyper-eutectic Al-Si alloys have shown considerable promise in terms of both Si refinement of nano-scale (verified with both by SEM and TEM studies) and limited mechanical testing. The preliminary experiments indicate that the solidification conditions together with the new hypothesis of Si refinement can besuccessfully used with permanent mold casting. Recent permanent mold casting of such Al-8%Si-1.8%Ba hypo-eutectic Al-Si alloys have resulted cast alloys that without any further processing revealed a microstructure in which eutectic silicon assumes nano-fibrous morphology and where the primary aluminium phase shows dendrites of very fine size. The alloys in as cast conditions exhibit UTS values of around 172 Mpa and ductility values of about 15%.
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Shamsuzzoha, M., Nastac, L., Haque, A. (2014). Development of High-Strength and Highly Ductile Hypo-Eutectic Al-Si Alloys by Nano-Refining the Constituent Phases. In: Grandfield, J. (eds) Light Metals 2014. Springer, Cham. https://doi.org/10.1007/978-3-319-48144-9_62
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DOI: https://doi.org/10.1007/978-3-319-48144-9_62
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