2. (a) Label the phases in the phase diagram shown in Figure Q2. (b) For points 1 and 3 marked in the phase diagram determine compositions of the phases present and the relative fractions of the phases (please show work, not just the final result). (c) For an alloy with composition 92 wt.% B and two temperatures marked by points 2 and 3 in the phase diagram shown in the previous page, draw schematically the microstructure formed by a slow cooling from the melt. On your drawing, please list and label all the phases and microconstituents. (d) For point 3, calculate the fractions of the microconstituents, assuming that the composition at the eutectic point is at 90 wt.% B (please show work, not just the final result). T, C 92 wt.% B 68 wt.% B 600 300 0 20 40 60 80 100 A B Weight percent B Figure Q2 Hypothetical alloy of A and B -2 3