Using the Al−Cu phase diagram in (b), what is the amount of θ phase (in %) that would precipitate at the grain boundaries in the equilibrium microstructure after slow cooling shown in (a)? (b)Atomic percentage, copper0 20 80 90 1001,084.871,1002040s01,000L900800700660.45260053.5548.2567s05.6532.7525400300Al40 50 60Weight percentage, copper1020307080 90Cu (a)700100%(95.5% Al, 4.5% Cu)600500400Page 347Slow cool300200e precipitates at]« grain boundaries10090 95 100Timewt % AI

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what is the amount of θ phase

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter26: Welding Metallurgy

Section: Chapter Questions

Problem 12R: What is a eutectic composition?

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Question

Using the Al−Cu phase diagram in (b), what is the amount of θ phase (in %) that would precipitate at the grain boundaries in the equilibrium microstructure after slow cooling shown in (a)?

(b)
Atomic percentage, copper
0 20 80 90 100
1,084.87
1,100
20
40
s0
1,000
L
900
800
700
660.452
600
53.5
548.2
567
s0
5.65
32.7
525
400
300
Al
40 50 60
Weight percentage, copper
10
20
30
70
80 90
Cu

(a)
700
100%
(95.5% Al, 4.5% Cu)
600
500
400
Page 347
Slow cool
300
200
e precipitates at
]« grain boundaries
100
90 95 100
Time
wt % AI

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