Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 8.15, Problem 26AAP
A Pb–Sn alloy (Fig. 8.12) contains 40 wt% β and 60 wt% α at 50°C. What is the average composition of Pb and Sn in this alloy?
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For 5.7 kg of a magnesium–lead alloy of composition 50 wt% Pb–50 wt% Mg, is it possible, at equilibrium, to have α and Mg2Pb phases with respective masses of 5.13 and 0.57 kg? If so, what will be the approximate temperature of the alloy? If such an alloy is not possible, then explain why.
For a Pb-30% Sn alloy, determine the phases
400
present, their amounts, and their compositions
at 300°C, 200°C, and 0°C
Hypoeutectic
Hypereutectic
----- L
L.
300
Liquidus
Solidus
Liquidus
L+B
a+L
-Solidus
200
19
183°
97.5
Solvus
Eutectic
Solvus-
100
(E)
a+ B
a + E
E+B
Pb
20
40
60
80
Sn
Temperature ("C)
An alloy system consists of two metals
A&B which are soluble in each other in
all proportions in the liquid state, but
completely insoluble in the solid state.
The melting point of metal A is 425°C
and B is 375°C. The lowest melting point
(Eutectic) is 230°C at 40%B.
For a 40 wt% B alloy at 450°C, the
phases weight are
0 kg A, 0 kg B and 1 kg Liquid
0 kg Liquid and 1 kg A
0.5 kg B& 0.5 kg A
O 0.35 kg A and 0.65 kg B
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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