2.a) In the Pb-Sn binary equilibrium diagram showing an eutectic reaction, T. (Pb) = 327C, T. (Sn) = 232C, eutectic temperature is 183C and the eutectic point is 38% Pb. Sn dissolves at most 19% in Pb, and the solubility drops to 5% at room temperature. Pb dissolves at most 3% in Sn and the solubility drops to zero at 100C. Draw the phase diagram of this system schematically, show the given values on the diagram and fill in the fields. (34 p.) b) Draw the cooling curves of 100% Pb, 75%n, 23% Sn and 62% Sn alloys? (16 p.)