The projection of the liquidus surface of the ternary system A-B-C is shown in figure. Heavy lines are phase boundaries and dashed lines are the isotherms. (a) Label the primary crystallization areas

The projection of the liquidus surface of the ternary system A-B-C is shown in figure. Heavy lines are phase boundaries and dashed lines are the isotherms. 

(a) Label the primary crystallization areas. 

(b) Identify invariant points and estimate their temperatures.

 (c) Show directions of falling temperatures along boundaries inside the ternary and along the edges of the composition triangle. (d) What are the solidus and liquidus temperatures of the alloy designated as T,U,X,W,Y,Z. 

(e) Trace on the diagram, the crystallization (cooling) paths for alloys X, Y,W,T. 

(f) Which phases are present in the alloy T when it is kept at 900 C. What are the relative quantities and the compositions of the phases.

 (g) Which phases will be present in the alloy W at room temperature and what are the relative quantities of these phases? 

(h) Draw the isothermal sections at 900 C and 1000 C