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Question 7) (15 points) It is known that the kinetics of recrystallization for some alloy obey the Avrami equation and that the value of n in the exponential is 2.5. If, at some temperature, the fraction recrystallized is 0.50 after 200 min, determine the rate of recrystallization at this termperature. Composition (at% Ag) 20 40 60 80 0 1200 100 2200 2000 -Liquidus 1000 Liquid Solidus 1800 F Q+L 1600 800 779C (Te) B+L E B 8.0 (Cae 71.9 G B 1400 Temperature (C) (CE) 91.2 (CBE) Temperature (F) 1200 600 Solvus 1000 Q+B 800 400 c 600 H 200 0 20 40 60 400 100 80 (Cu) Composition (wt% Ag) (Ag) Composition (at% Sn) 0 20 40 60 80 100 327C 600 300 Liquid 500 232C a + L 200 CY 183C B + L 400 Temperature (C) Temperature (F) 18.3 61.9 97.8 300 100 +B 200 100 0 20 40 60 80 100 (Pb) Composition (wt% Sn) (Sn) Composition (at Pol D 5 10 30 40 70 100 20 | 700 1.200 600 a #L MAPA 1000 500 800 400 Temperature (C) + I + ME Pb Temperature (F) 600 300 400 200 + Me PB 100 + Me Pb 200 ME.PL 1 0 0 20 40 50 80 100 Mg) Composition (wt% PU (Pb) Composition (at % Zn) 0 1200 20 40 60 80 100 2200 2000 a Liquid 1000 1800 8+L 1600 800 1400 B Temperature (0) Temperature (F) B 7 8 + L 1200 B 8 600 Y 6 + e 1 +L 1000 + 7 B' E 800 JE 400 ye + B F + 7 600 200 0 20 40 60 80 400 100 (Zn) (Cu) Composition (wt% Zn)