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QUESTION 12
The microstructure of a Pb-Sn alloy at 183°C (361.4°F) consists of a and B structures. If the composition of the alloy is 61.9 wt% Sn, what is
the relative mass fraction of each phase?
Composition (at% Sn)
20
40
60
80
100
327°C
600
300
Liquid
500
232°C
a + L
200
ß + L
400
183°C
18.3
61.9
97.8
300
100
a + B
200
100
20
40
60
80
100
(Pb)
Composition (wt% Sn)
(Sn)
Temperature (°C)
Temperature (°F)

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