Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 8.15, Problem 32AAP
For an alloy of Cu–70 wt% Pb (Fig. 8.24), determine the amounts and compositions in weight percent of the phases present at (a) 955°C + ΔT, (b) 955°C − ΔT, and (c) 200°C.
Figure 8.24
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Calculate the amounts and compositions of phases at 726oC in a Fe-0.6% C alloy cooled under equilibrium conditions. Disregard the amounts of proeutectoid phases.
A.
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91.3% α, 8.7% Fe3C; C in α = 0.05% and C in Fe3C = 8.4%
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Sıcaklık (C)
800
700
600
500
400
300
200
100
0
10
1
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M(başlama)
M(% 50)
M(% 90)
10
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-Otektoid Sıcaklık
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Zaman (s)
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BI (a) Figure BI below shows the equilibrium phase diagram of hypothetical A - B alloy system.
Answer the following questions.
What are technical names of Line A and Line B? What do they signify?
(i)
(ii) With the aid sketches, portray the microstructures and phases that are present for the
20wt%A-80wt%B alloy (Alloy A) at the temperatures of 780 °C, 670 °C, 652 °C, and 500
°C, respectively.
(iii) Assume an A - B alloy (Alloy B) has 60wt%a - 40wt%L, in terms of weight, at a
temperature of 652 °C. Determine the overall composition of Alloy B.
(o) emai
700
8 600
500
400
800
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A
760 °C
Line B
W
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Line A
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650 °C
40
Liquid (L)
wt%B
Figure B1
52.5
a + ß
60
B+L
80
93.7 B
100
B
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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