Abstract
The porosity distribution in AM60 High Pressure Die Cast (HPDC) boxes was studied. Boxes were either cast conventionally, or with liquid metal protection from oxidation by means of argon gas atmosphere in the sleeve. The inert atmosphere reduced the presence of oxide inclusions and porosity in the castings. Porosity was concentrated in continuous bands or clusters, depending on the distance from the gates. A high oxygen and aluminium segregation was revealed in association with bands of porosity. Porosity reduction and the absence of oxide films defects, both obtained by means of argon protection in the sleeve, produced an increase in the elongation to fracture which could be related to ductility and density.
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