Use of SEM and EDS analysis in the investigation of Al-Si-Cu piston alloy cast porosity

Use of SEM and EDS analysis in the investigation of Al-Si-Cu piston alloy cast porosity

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Porosity formation was detected in the casting thinnest section in the proximity of the as cast surface TARGETS and near the wall centerline.In order to investigate the cause of the porosity formation light microscopy was used to define as cast structure.After initial findings SEM and Barista Tools EDS analyses were performed.

Based on the results it is possible to define cause of the observed porosity.A number of pores originates from the mould filling stage and entrainment of the oxide films, while others appear due to insufficient feeding during solidification.