Question

Which phase fields does the liquidus line separate?

A. It separates the liquid and liquid + solid regions.

B. It separates the solid and liquid + solid regions.

C. It separates the solid(α) and solid(α) + solid (β) regions.

D. It separates the liquid + solid (α) and solid (α) + solid (β) regions.

Answer 1

Liquidus line is by definition the line above which only liquid phase exists. Or in other words it separates the region where only liquid phase exists from the region of solid+liquid mixture phase.

therefore option A is correct. Other options B, C and D are incorrect because they are not satisfying the definition of Liquidus Line.

also solidus line is the line which separate pure solid and liquid +solid region.