Composition (at% Sn) 60 O 20 40 80 100 327C 600 300 Liquid 500 232C A 200 400 183C Temperature (C) a 18.3 61.9 97.8 Temperature (F) 300 100 +B 200 100 20 60 80 100 40 Composition (wt% Sn) (Pb) (Sn) 10 From the above alloy phase diagram, (1) What phases are present at point A? (2) What are wt% Sn and Pb at eutectic invariant point? (3) What is eutectic temperature? (4) For eutectic composition, at what temperature does complete melting of this alloy occur