1) An alloy of 30 wt % Pb and 70 wt % Sn is slowly cooled...

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1) An alloy of 30 wt % Pb and 70 wt % Sn is slowly cooled from 250C to 27C (see Fig. given below). (a) Is this alloy hypoeutectic or hypereutectic? (b) What is the composition of the first solid to form? (c) What are the amounts and compositions of each phase that is present at 183C + AT? (d) What is the amount and composition of each phase that is present at 183C - AT? Temperature (C) 300 200 100 0 0 20 40 Composition (at % Sn) 60 80 100 327C 18.3 a+L 20 40 (Pb) Liquid 600 500 232C 183C B+L 61.9 97.8 a + B T 60 80 100 (Sn) Composition (wt% Sn) 400 300 200 100 Temperature (F) 1) An alloy of 30 wt % Pb and 70 wt % Sn is slowly cooled from 250C to 27C (see Fig. given below). (a) Is this alloy hypoeutectic or hypereutectic? (b) What is the composition of the first solid to form? (c) What are the amounts and compositions of each phase that is present at 183C + AT? (d) What is the amount and composition of each phase that is present at 183C - AT? Temperature (C) 300 200 100 0 0 20 40 Composition (at % Sn) 60 80 100 327C 18.3 a+L 20 40 (Pb) Liquid 600 500 232C 183C B+L 61.9 97.8 a + B T 60 80 100 (Sn) Composition (wt% Sn) 400 300 200 100 Temperature (F)