Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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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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For an alloy containing 40% p Sn - 60% p Pb at a temperature of 150°C:
(a) Which phases are gifts?
(b) What is (are) the composition(s) of this (s) phase(s)?
(c) Calculate as quantities relatives of each phase present in terms of the mass fraction.
(image attached below)
5. For 40 wt% Sn – 60 wt% Pb alloy at 150 oC (at point B) as shown in Figure,
ii.
Calculate the composition(s) of the phase(s) present.
iii.
Calculate the amount of each phase present in terms of mass fraction.
600
300
Liquid
500
a+L
200
400
300
100
200
100
20
60
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100
(Pb)
(Sn)
Composition (wt% Sn)
Temperature ("C)
Temperat ure ("F)
According to the following graph, two samples of 1080 steel are cooled from the eutectoid
temperature, one at a cooling rate of 250°C/s and the other at a cooling rate of 7.27x10-8 °C/s.
Specify the phases obtained and explain their formation from thermodynamic and kinetic
perspectives. Also, briefly describe their formation. Draw the microstructure of the phases obtained.
Sıcaklık (C)
800
700
600
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400
300
200
100
0
10
1
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M(başlama)
M(% 50)
M(% 90)
10
M+O
-Otektoid Sıcaklık
10²
Zaman (s)
% 50
10³ 104
105
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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