Answer the following questions based on the PbSn phase diagr

Answer the following questions based on the Pb-Sn phase diagram. For full credit, the phase diagram MUST be clearly marked to communicate your answers. Use a straight edge. Is this a binary diagram? Yes or No. Is this an isomorphous system? Yes or No. How many single phases are there? What are they? What is the melting temperature of pure Sn? What are the phases with 90 wt% Sn and 200 C? Based on your answer in Question 4, what is the composition listed? What is the eutectic temperature? A1 40 wt% Sn, 180 degree C, the composition of alpha phase and beta phase wt% Sn respectively. Calculate the weight percentage of each phase.

Solution

[1] IS THIS A BINARY PHASE DIAGRAM ---- YES (ANSWER)

IS THIS AN ISOMORPHOUS SYSTEM --- YES (ANSWER)

[2] THERE ARE THREE SINGLE PHASES. LIQUID, SN PHASE AND PB PHASE. (ANSWER)

[3] MELTING TEMPERATURE OF PURE SN = 232°C (ANSWER)

[4] PHASE WITH 90%wt SN AND 200°C = L+ (ANSWER)

[5] COMPOSITION OF L = 73% AND THAT OF = 97% (ANSWER)

[6] EUTECTIC TEMPERATURE = 183°C (ANSWER)

[7] 17% OF AND 98% OF   (ANSWER)