2. Using the Al-Cu phase diagram shown below, please answer the following questions for each temperature
and composition (Lecture 14.2, Callister 9).
(i) What phases are present, e.g. L, a, ... etc. ?
(ii) What is the composition of each phase, e.g. wt% of Al and wt% of Cu?
(iii) How much of each phase is present, e.g. % L, % a, etc.?
(iv) Draw a sketch of the equilibrium microstructure.
(a) 33.2 wt% Cu at 456 °C
(b) 5 wt% Cu at 600 °C
(c) 2.5 wt% Cu at 400 °C
(d) 45 wt% Cu at 400 °C
(e) 40 wt% Cu at 700 °C
(f) 2.5 wt% Cu at 600 °C
Temperature, °C
700
660°C
L+$\epsilon_2$
L
L+$\eta_1$
600
L+ a
$\alpha$
5.65
548°C
33.2
L+$\theta$
52.5
$\theta$+$\eta_1$
$\theta$
500
$\alpha$ + $\theta$
$\theta$+$\eta_2$
400
300
0
Al
100%
10
20
30
40
50
60
70
Wt % Copper
