equilibrium diagram for such alloys. The dashed lines on the diagram indicate
the phase that can occur with extremely slow cooling. The structure that
normally occurs with up to about 10 per cent tin is predominantly a solid
solution. Higher percentage tin alloys will invariably include a significant
amount of the δ phase. This is a brittle intermetallic compound, the a phase
being ductile.
Cu
B
1200
1000
800
600
400
200
/
/
a
Liquid
s^liquid ^^^^
1
a
+
ß
1
/ α
+
δ
a
+
ε
vT
a
+
γ
u
o
<υ
a.
E
1200
1000
800
600
400
200
\ Liq
uid
==—c:
a
a + liquid
V
\
<,
V
α
+
γ
?
0
100
5
95
10
90
15
85
20 25% Sn
80
75%
Cu
0
100
2
98
4
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