(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.

(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

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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Question

(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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