Question: 13. Consider a 35 wt% Sn-65 wt% Pb alloy. Composition (at% Sn) 20 40 60 327C Temperature (C) 300 200 a + L 100 183C

13. Consider a 35 wt% Sn-65 wt% Pb alloy. Composition (at%

13. Consider a 35 wt% Sn-65 wt% Pb alloy. Composition (at% Sn) 20 40 60 327C Temperature (C) 300 200 a + L 100 183C Liquid a + p 61.9 80 B+L 232C 97.8 100 sl 600 500 18.3 20 40 60 80 100 (Pb) Composition (wt% Sn) (Sn) (a) [4 pts] Is the alloy hypoeutectic or hypereutectic? (b) [4 pts] At 182C (Just below the eutectic temperature), what is the weight fraction of B phase? (c) [4 pts] At 182C, what is the weight fraction of primary a? (d) [4 pts] At 182C, what is the weight fraction of eutectic structure? (e) [4 pts] Draw the microstructure at 182 C. Please label each phase clearly. 400 Temperature (F) 300 200 100

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