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Structure of Al5Mg2SiMn casting alloy with and without of Sc addition, morphology of primary phases and specifically morphology of the Sc-containing intermetallic compounds and nanoscale properties of the α-Al matrix of Al-Mg-Si-Mn alloys were observed. Morphology and chemical composition were investigated by scanning electron microscopy on polished and deep etched microsections. It was found that addition of Sc changes morphology of α-Al, Al-Mg 2 Si eutectic and intermetallic compounds with Mn. α-Al dendrites change their morphology to spherical, lamellar Al-Mg 2 Si eutectic to fine fibrous eutectic. It was found that crystals Al 3 Sc can act as nucleating particles of α-Al grains, as well as Mg 2 Si eutectic fibrous. The mechanisms of nucleation can be attributed to heterogeneous nucleation.