Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 8.15, Problem 22AAP
Consider an alloy containing 70 wt% Ni and 30 wt% Cu (see Fig. 8.5).
- a. At 1350°C, make a phase analysis assuming equilibrium conditions. In the phase analysis, include the following:
- i. What phases are present?
- ii. What is the chemical composition of each phase?
- iii. What amount of each phase is present?
- b. Make a similar phase analysis at 1500°C.
- c. Sketch the microstructure of the alloy at each of these temperatures by using circular microscopic fields.
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5. For 40 wt% Sn – 60 wt% Pb alloy at 150 oC (at point B) as shown in Figure,
ii.
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iii.
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600
300
Liquid
500
a+L
200
400
300
100
200
100
20
60
80
100
(Pb)
(Sn)
Composition (wt% Sn)
Temperature ("C)
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A lead-tin (Pb-Sn) alloy of composition 30 wt % Sn and 70 wt % Pb is slowly heated from a temperature of 140 OC. Refer to the phase diagram provided in Figure 1 and answer the following.
(i) At what temperature does the first liquid phase form?
(ii) What is the composition of this liquid phase?
(iii) At what temperature does complete melting of the alloy occur?
(iv) What is the composition of the last solid remaining prior to complete melting?
A lead-tin (Pb-Sn) alloy of composition 50 wt % Sn and 50 wt % Pb is slowly heated from a temperature of 100 °C. Refer to the phase diagram provided
in Figure 1 and answer the following.
(i) At what temperature does the first liquid phase form?
(ii) What is the composition of this liquid phase?
(iii) At what temperature does complete melting of the alloy occur?
(iv) What is the composition of the last solid remaining prior to complete melting?
Composition (at% Sn)
20
40
60
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100
327°C
600
300
Liquid
500
232°C
a + L
200
B+L
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183°C
18.3
61.9
97.8
300
100
a + B
200
H100
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(Pb)
Composition (wt% Sn)
(Sn)
Figure 1. Lead (Pb) and Tin (Sn) Phase diagram
Temperature (°C)
Temperature (°F)
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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