Solvus Line: Shows how much of one material is soluble in another at a certain temperature.
Liquidus Line: Between fully liquid state and beginning of solidification.
Solidus Line: Determines the end of solidification.
Pasty Region: Part Solid, Part liquid.
Solid Solution Alloy: Occurs when two metals are completely soluble in each other.
Eutectic Alloy: Occurs when two metals are soluble in each other in the liquid state but completely insoluble in the solid state.
Partial Solubility: Two metals completely soluble in each other in the liquid state but only partially soluble in each other in the solid state. E.g. lead and tin.