Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 8.15, Problem 23AAP
Consider the binary eutectic copper–silver phase diagram in Figure P8.23. Make phase analyses of an 88 wt% Ag–12 wt% Cu alloy at the temperatures (a) 1000°C, (b) 800°C, (c) 780°C + ΔT, and (d) 780°C − ΔT. In the phase analyses, include:
- i. The phases present
- ii. The chemical compositions of the phases
- iii. The amounts of each phase
- iv. Sketch the microstructure by using 2-cm-diameter circular fields.
Figure P8.23
The copper–silver phase diagram.
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Consider the binary eutectic copper-silver phase diagram shown below. Make phase analysis of a 80 wt % Ag–20 wt% Cu alloy at the temperatures (a) 900°C, and (b) 780°C-ΔT. In the phase analysis include: (I) phases present, (ii) chemical compositions of phases, (iii) mass fractions of phases, and (iv) sketch of microstructure.
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Composition (at% Sn)
20
40
60
80
100
327°C
600
300
Liquid
500
232°C
a + L
200
B+L
1400
183°C
18.3
61.9
97.8
300
100
a + B
200
H100
20
40
60
80
100
(Pb)
Composition (wt% Sn)
(Sn)
Figure 1. Lead (Pb) and Tin (Sn) Phase diagram
Temperature (°C)
Temperature (°F)
The figure below shows Pb-Sn phase
diagram. What is the composition of Pb and
Sn at point 1?
1200
1000
Liquid
a +L
779 C (Tg)
B+L
6 800
8.0
71.9
G
91.2
600
400
200
20
40
60
80
100
(Pb)
Composition (wt% Sni
(Sn)
Callister Jr., W.D., 2007
O a. 80 wt % Sn and 20 wt % Pb
O b. 10 wt % Sn and 90 wt % Pb
O c. 90 wt % Sn and 10 wt % Pb
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Temperature ("C)
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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