Please answer the following questions. No work needed.

Using the phase diagram shown below, which of the following alloys is most likely to result in the highest concentration of Pb at the grain boundaries relative to the rest of the matrix? T(C) 300 L (liquid) L+ a a 2007 [+BOB 183C 100! a+B 0 20 100 I 40 60 80 C, wt% Sn 90% Pb - 10% Sn 70% Pb - 30% Sn 10% Pb - 90% Sn 2% Pb- 98% Sn 38.1% Pb - 61.9% Sn Using the iron-carbon phase diagram shown below, consider a 2.1 kg of steel alloy containing 1.6 wt% C cooled to below 727 C, the mass content of proeutectoid phase (kg) is: = Composition = 0 wt% Composition = 0 at% Temperature = 0 C Temperature = 32 F Composition (at% C) 10 15 20 25 5 1600 1538 C 1493 C L 1400 2500 1394 C 7+L 1200 1147 C 2.14 4.30 42000 Temperature (C) 7. Austenite 1000 912 C Temperature (F) 7+ Fec 800 1500 727 C 0.76 600 0.022 Feritte 085 C Fe:C Cementite (Fe-C) 1000 400 0 Fe) 1 2 5 6 6.70 3 4 Composition (wt% C) For some metal alloy it is known that the kinetics of recrystallization obey the Avrami equation, and that the value of n in the exponential is 1.2, for time in seconds. If, at some temperature, the rate of recrystallization is 0.0014 s-1, what total time (in seconds) is required for the recrystallization reaction to go to 70% completion? What is the minimum temperature (C) needed to heat up a steel alloy (1.5% C) to start a normalizing process? Composition = 0 wt% Composition = 0 at% Temperature = 0 C Temperature = 32 F Composition (at% C) 10 15 20 25 1600 5 1538 C 1493 C 1400 L 2500 1394 C 7+ 1200 1147 C 2.14 4.30 2000 Temperature (C) 7. Austenite 1000 912 C Temperature (F) 7+ Fec 800 1500 727 C + 0.76 600 0.022 a, Feritte b085 C Fec Cementite (Fe-C) 1000 400 0 1 2 5 6 6.70 3 4 Composition (wt% C)