The Lead-Tin phase diagram: a) Show the eutectic three phase reaction on this phase diagram. b)...

 

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The Lead-Tin phase diagram: a) Show the eutectic three phase reaction on this phase diagram. b) A Pb-45% Sn alloy is cooled from 300°C to 100°C. What phases are present for this alloy at this temperature range? What is the composition of the phases? How much of each phase is present? c) Calculate the amount of eutectic mixture for Pb-45% Sn alloy at 100°C. d) What is the alloy composition (Pb-x% Sn), which has a microstructure of 60% Eutectic mixture and 40% ß phase at 100°C. Composition (at% Sn) 60 0 20 40 80 100 1 Temperature (°C) 300 200 100 327°C '0 (Pb) a a + L 18.3 20 183°C a + B Liquid 61.9 40 60 Composition (wt% Sn) 80 B+L 232°C 97.8 600 500 400 300 200 100 100 (Sn) Temperature (°F) The Lead-Tin phase diagram: a) Show the eutectic three phase reaction on this phase diagram. b) A Pb-45% Sn alloy is cooled from 300°C to 100°C. What phases are present for this alloy at this temperature range? What is the composition of the phases? How much of each phase is present? c) Calculate the amount of eutectic mixture for Pb-45% Sn alloy at 100°C. d) What is the alloy composition (Pb-x% Sn), which has a microstructure of 60% Eutectic mixture and 40% ß phase at 100°C. Composition (at% Sn) 60 0 20 40 80 100 1 Temperature (°C) 300 200 100 327°C '0 (Pb) a a + L 18.3 20 183°C a + B Liquid 61.9 40 60 Composition (wt% Sn) 80 B+L 232°C 97.8 600 500 400 300 200 100 100 (Sn) Temperature (°F)

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