Abstract
In hypereutectic Al−Si alloys, Sr exists on the surfaces of primary Si phases as well as eutectic Si phases and can change the growth mode of the primary Si from non-faceted to faceted as the amount of Sr increases beyond 0.04wt.%. However, Sc exists in the α-Al matrix instead of on the surface of the Si phases and does not significantly affect the growth mode of the primary Si phases. EBSD analysis suggests that until over-modification occurs a fraction of the twin boundary increases as the amounts of Sc and Sr increase. The twin boundary is a high-angle special boundary that occurs at a 60 degree misorientation angle.
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Kim, M. Electron back scattering diffraction (EBSD) analysis of hypereutectic Al−Si alloys modified by Sr and Sc. Met. Mater. Int. 13, 103–107 (2007). https://doi.org/10.1007/BF03027559
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DOI: https://doi.org/10.1007/BF03027559