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Centrifugal casting of in-situ Al-Mg2Si(1-x)Snx composites: a study of radial segregation

ABSTRACT During centrifugal casting of Al-Mg2Si hypereutectic cylinders, the light Mg2Si particles are commonly segregated in centripetal direction towards the inner periphery. In order to change this inevitable centripetal segregation of Mg2Si particles, some amounts of tin up to 8 wt pct were added to Al-15wt.% Mg2Si alloy to enhance the formation of Mg2Si(1−x)Snx particles with variant stoichiometry thus variant density. XRD, EDS, optical metallography and hardness measurements were used to evaluate the stoichiometry and segregation patterns of in situ formed Mg2Si(1−x)Snx particles. According to the results, the cylinder containing 6 wt pct Sn illustrates a rather uniform distribution of particles thus hardness in all radial sections. However, the cylinders with higher amounts of Sn exhibit a radial segregation of Mg2Si(1−x)Snx particles in centrifugal direction towards the outer periphery. The results are interpreted in view of the Stokes’ law and the difference in density of the particles and the melt.