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Browsing by Author "Link, Thomas"

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    Item type:Article, Access status: Open Access ,
    Structure characterization and precipitation in two Al-Mg-Si-Mn casting alloys
    (2014) Link, Thomas; Bojko, Vìctorìâ; Mihalenkov, Kostântin Vìktoroviĉ
    The as-cast structure of permanent mould (PM) (alloy I) and high-pressure die castings (HPDC) (alloy2) of the AlMg5Si2Mn alloy has been investigated by differential scanning calorimetry, microhardness measurements, transmission electron microscopy, and energy dispersive X-ray analysis. Inside the ?-Al grains in both alloys, curved plate-like precipitates were detected in both alloys. Examination of these precipitates revealed a number of features, such as: (1) the composition of the precipitates is very close to the stochiometric Mg2Si compound, (2) precipitates are aligned along dislocations, (3) the precipitate density is much higher for high-pressure die castings where the ?-Al matrix contains more dislocations than in permanent mould castings, (4) precipitates lie inside the ?-Al grains where they are randomly distributed. Between the Mg2Si larnellas, precipitates were not observed. Microhardness tests show that the hardness of the alloy cast into a permanent mould is lower than that of a high-pressure die casting. This observation reveals the origin of high strength in an AlMg5Si2Mn alloy subjected to HPDC.