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Cu-Sn System (Reactions (Eutectoid Reaction (image (T=461K, xh/h0 = 0.455)…
Cu-Sn System
Reactions
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Metatectic Reaction
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Eutectic Reaction ( )
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Microstructure
The microstructure of the leaded copper tin alloy are similar to the nonleaded materials with the addition of lead particles in the inter-dendritic boundaries. The lead is practically insoluble in solid copper and it solidifies last as almost pure lead in the grain boundaries.
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Last liquid to solidify is enriched with tin upon cooling, and forms alpha and delta phases
Consists of cored dendrites, they have a composition gradient of increasing tin as they grow
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Phase Diagram