Class Problem (Phase Diagram):
Make phase analysis of the equilibrium (ideal) solidification of lead-tin
alloys at the following points in the lead-tin phase diagram.
(a) At the eutectic composition just below 183\deg C (eutectic temperature).
(b) The point c at 40%Sn and 230\deg C.
(c) The point d at 40%Sn and 183\deg C+\Delta T.
(d) The point e at 40%Sn and 183\deg C-\Delta T.