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QUESTION 12 Presented below is the aluminium-rich end of the Al-Cu binary phase diagram, which is the basis of many high-strength aluminium alloys. You may assume that all the phase boundaries may be described by straight lines. 700 660 °C L 600 L + ? Temperature (°C) 548 °C 500 5.5 wt% Cu 33 wt.% Cu 400 ? + ? 300 200 100 1 wt% Cu L + ? 0 0 10 20 30 40 50 Composition (wt.% Cu) 0-Al?Cu For an alloy containing 4wt.% Cu, i. Calculate, assuming slow cooling, the volume fraction and composition of the solid at 600°C. [5 marks] ii. Repeat the calculation for rapid cooling conditions (Scheil). [6 marks]

          QUESTION 12
Presented below is the aluminium-rich end of the Al-Cu binary phase diagram, which
is the basis of many high-strength aluminium alloys. You may assume that all the
phase boundaries may be described by straight lines.
700
660 °C
L
600
L + ?
Temperature (°C)
548 °C
500
5.5 wt% Cu
33 wt.% Cu
400
? + ?
300
200
100
1 wt% Cu
L + ?
0
0
10
20
30
40
50
Composition (wt.% Cu)
0-Al?Cu
For an alloy containing 4wt.% Cu,
i.
Calculate, assuming slow cooling, the volume fraction and composition of
the solid at 600°C.  [5 marks]
ii. Repeat the calculation for rapid cooling conditions (Scheil). [6 marks]

$QUESTION 12 Presented below is the aluminium-rich end of the Al-Cu binary phase diagram, which is the basis of many high-strength aluminium alloys. You may assume that all the phase boundaries may be described by straight lines. 700 660 °C L 600 L + ? Temperature (°C) 548 °C 500 5.5 wt% Cu 33 wt.% Cu 400 ? + ? 300 200 100 1 wt% Cu L + ? 0 0 10 20 30 40 50 Composition (wt.% Cu) 0-Al?Cu For an alloy containing 4wt.% Cu, i. Calculate, assuming slow cooling, the volume fraction and composition of the solid at 600°C. [5 marks] ii. Repeat the calculation for rapid cooling conditions (Scheil). [6 marks]$

Added by Mallory S.

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