A single solidification point is a temperature point where an alloy changes from fully liquid to fully solid without going through a partially liquid stage - i.e. no further decrease in temperature is required to produce a fully solid alloy. Every phase diagram has two such points - 100% element A and 100% element B, as pure elements have a specific solidification temperature (or if you like, melting point). If the phase diagram has one (or more) eutectic point(s) then each of these will be a single solidification point also.
Associated terms: Alloy, Phase, Phase Diagram, Eutectic Point
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