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Multistep nucleation and multi-modification effect of Sc in hypoeutectic Al-Mg-Si alloys

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 inves...

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Detalles Bibliográficos
Autores principales: Trudonoshyn, Oleksandr, Prach, Olena
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6378345/
https://www.ncbi.nlm.nih.gov/pubmed/30815596
http://dx.doi.org/10.1016/j.heliyon.2019.e01202
Descripción
Sumario: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.