(a) Fig. Q2(a) shows the equilibrium phase diagram of a Magnesium-Lead (Mg-Pb) eutectic alloy system. The alloy with the composition of 90 wt% Pb is slowly cooled from 600°C. Using the given phase diagram answer the following questions: (i) At which temperature does the first solid phase form? (ii) What is the composition of this solid phase? (iii) What is the composition of the remaining phase? (iv) Sketch and label the microstructure that may form below the eutectic temperature.

Elements Of Electromagnetics
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(a) Fig. Q2(a) shows the equilibrium phase diagram of a Magnesium-Lead (Mg-Pb)
eutectic alloy system. The alloy with the composition of 90 wt% Pb is slowly cooled
from 600°C. Using the given phase diagram answer the following questions:
(i)
At which temperature does the first solid phase form?
(ii)
What is the composition of this solid phase?
(iii)
What is the composition of the remaining phase?
(iv)
Sketch and label the microstructure that may form below the eutectic
temperature.
Composition (at% Pb)
70 100
10
20
30 40
700
1200
600
L.
1000
500
800
400
Mg, Pb
600
300
400
200
Mg Pb
B+
Mg Pb
200
100
Mg, Pb
20
40
60
80
100
(Mg)
Composition (wt% Pb)
(Pb)
Fig.Q2(a): Mg-Pb phase diagram
Temperature ("C)
Temperature ("F)
Transcribed Image Text:(a) Fig. Q2(a) shows the equilibrium phase diagram of a Magnesium-Lead (Mg-Pb) eutectic alloy system. The alloy with the composition of 90 wt% Pb is slowly cooled from 600°C. Using the given phase diagram answer the following questions: (i) At which temperature does the first solid phase form? (ii) What is the composition of this solid phase? (iii) What is the composition of the remaining phase? (iv) Sketch and label the microstructure that may form below the eutectic temperature. Composition (at% Pb) 70 100 10 20 30 40 700 1200 600 L. 1000 500 800 400 Mg, Pb 600 300 400 200 Mg Pb B+ Mg Pb 200 100 Mg, Pb 20 40 60 80 100 (Mg) Composition (wt% Pb) (Pb) Fig.Q2(a): Mg-Pb phase diagram Temperature ("C) Temperature ("F)
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