Figure 3.1 shows the binary phase diagram of lead-tin (Pb-Sn) alloy. Consider 900 g of the Pb-Sn alloy is cooled to 150 C. (a) Sketch and label the microstructure of Pb-Sn alloy formed at the eutectic composition (CE) of 61.9 wt% and the eutectic temperature (Te) of 183 C. (3 Marks) (b) Sketch and label the hypereutectic microstructure of Pb-Sn alloy formed in region Z at temperature of 150 C. (4 Marks) (c) If the total weight fraction of f(w) is 84.7% and the weight fraction of pro-eutectic Bis 45.8%, calculate the mass of eutectic formed in region Z at 150 C. (8 Marks) (d) If the weight fraction of pro-eutectic B in region Z is same with the weight fraction of the pro-eutectic pin region Y, calculate the composition of Sn (Co) at 200 C in region Y. (7 Marks) (C) Predict the microstructure of Pb-Sn alloy formed using an appropriate sketch and label in region Y at the point of intersection between 200C and Co calculated in (c). (3 Marks) 100 3270 600 300 ( La) 500 32c Region X) G 200 IE 1816 4400 ) 97.8 . 61.9 Temperature 300 100 Rei 200 100 0 10 20 30 100 40 60 Composition will IPO Figure 3.1: Binary Phase Diagram of Pb-Sn