Question

Solidification point defination​

Answer 1

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In general, the solidification point is also defined as a point at which the melt starts solidifying, i.e. the liquidus temperature.

Answer 2

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.