MACROMOSAIC STRUCTURES IN DILUTE TIN ALLOYS

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Abstract
The manner in which the striation and cellular substructures coexist during solidification was examined in dilute alloys of tin with lead and tin with antimony. Observation of solid–liquid interfaces produced by decanting the liquid from growing crystals showed that when both structures occurred simultaneously, striation boundaries lay within cell wall grooves as a result of the topography of the interface, and that they subsequently adopted a configuration which depended on the solute redistribution occurring during freezing. In the case of the tin–lead system, little striation boundary migration from cell walls was observed whilst considerable migration was found when antimony was the solute. This is attributed to the much higher local concentrations of lead than of antimony.

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