In the NiTi phase diagram: (a) Find and label all two-phase regions. (b) Find and label all three-phase points; identify the type of "reaction" at each (eutectic, eutectoid, etc.) and write out the reactions. (c) Identify the intermetallic phases. (d) A liquid of initial composition 15wt%Ni is slowly cooled to room temperature. Determine the various phases that appear and disappear, the order of these events and the temperatures at which they happen