- 12 Pts C2 This Question Refers To The Pb Sn Phase Diagram Shown Below Composition At Sn 0 20 40 60 80 100 B C 1 (147.28 KiB) Viewed 43 times
[12 Pts] C2. This question refers to the Pb-Sn phase diagram shown below. Composition (at% Sn) 0 20 40 60 80 100 [c] Temperature (°C) 300 200 327°C 100 a + L 183°C Liquid a + ß 61.9 B+L 232°C 97.8 600 500 18.3 20 40 60 80 100 (Pb) Composition (wt% Sn) (Sn) [a] Consider an ingot of a Pb-Sn alloy of an unknown composition cooled from the liquid state down to a temperature just below the eutectic temperature. Analysis of the microstructure revealed that it consists of the microconstituents 80 wt% eutectic and 20 wt% ß'. What is the composition of the alloy (in wt% Sn)? For that same alloy, what phases are present at this temperature? X+ P What are the mass fractions of those phases at this temperature? 400 300 200 100 Temperature (°F)