10. Below is shown the led-tin (Pb-Sn) phase diagram. 327C Temperature (C) 300 200 100 (Pb) a + L 18.3 20 183C 40 a + 8 Liquid 61.9 60 Composition (wt% Sn) 80 a) Describe the eutectic reaction: Write the reaction upon cooling. What is the temperature and composition of the eutectic reaction? 8+L 232C 97.8 10 (Sn) b) What is the maximum amount of Pb that can be dissolved in the a (alpha) phase? c) A led-tin alloy consists of 61.9% Sn, 38.1 % Pb. What are the chemical compositions of the individual phases and their weight fractions if it is cooled to T = 185C? d) A led-tin alloy consists of 61.9% Sn, 38.1 % Pb. What are the chemical compositions of the individual phases and their weight fractions if it is cooled to I = 180C?