QUESTION 1 Use the Pb-Sn diagram below to answer the following questions. 350 327°C Liquid, L 300 250 232°C Pb-rich 200 solid (Pb) Sn-rich 183°C solid (Sn) 18.3% 61.9% 97.8% 3 150 100 50 Two phase: (Sn) + (Pb) 10 20 30 40 50 60 70 80 90 100 Pb Sn wt.% Sn (a) What are the values of the state variables (composition and temperature) at constitution point 1? (b) Mark the constitution points for Pb-60wt% Sn and Pb-20wt% Sn alloys at 2500C. What phases are present in each case? (c) The alloy at constitution point 1 is cooled very slowly to room temperature, maintaining equilibrium. At which temperatures do changes in the number or type of phases occur? What phases are present at constitution points 2 and 3? (d) The alloy at constitution point 4 is cooled slowly to room temperature. Identify the following: (i) the initial composition, temperature and phase(s); (ii) the temperature at which a phase change occurs, and the final phase(s). Temperature, T (°C)

QUESTION 1 Use the Pb-Sn diagram below to answer the following questions. 350 327°C Liquid, L 300 250 232°C Pb-rich 200 solid (Pb) Sn-rich 183°C solid (Sn) 18.3% 61.9% 97.8% 3 150 100 50 Two phase: (Sn) + (Pb) 10 20 30 40 50 60 70 80 90 100 Pb Sn wt.% Sn (a) What are the values of the state variables (composition and temperature) at constitution point 1? (b) Mark the constitution points for Pb-60wt% Sn and Pb-20wt% Sn alloys at 2500C. What phases are present in each case? (c) The alloy at constitution point 1 is cooled very slowly to room temperature, maintaining equilibrium. At which temperatures do changes in the number or type of phases occur? What phases are present at constitution points 2 and 3? (d) The alloy at constitution point 4 is cooled slowly to room temperature. Identify the following: (i) the initial composition, temperature and phase(s); (ii) the temperature at which a phase change occurs, and the final phase(s). Temperature, T (°C)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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