Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 5.7, Problem 40SEP
To determine
The melt temperatures of copper and aluminum are 1083°C and 657°C respectively. Compare the diffusivities of copper in copper and copper in aluminum at 500°C (use Table 5.2). Can you explain why a drastic difference exists.
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A 1.5-kg specimen of a 88 wt% Pb-12 wt% Sn alloy (Animated Figure 9.8) is heated to 220°C; at this temperature it is entirely an a-
phase solid solution. The alloy is to be melted to the extent that 50% of the specimen is liquid, the remainder being the a phase. This
may be accomplished either by heating the alloy or changing its composition while holding the temperature constant.
(a) To what temperature must the specimen be heated?
i
°C
(b) How much tin must be added to the 1.5-kg specimen at 220°C to achieve this state?
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kg
Question-3
If 500 g of a 40 wt % Ag - 60 wt % Cu alloy is slowly cooled from 1000°C to just below 780°C:
(a) How many grams of liquid and proeutectic alpha are present at 850°C?
(b) How many grams of liquid and proeutectic alpha are present at 780°C + AT ?
(c) How many grams of alpha are present in the eutectic structure at 780°C - AT ?
(d) How many grams of beta are present in the eutectic structure at 780°C - AT ?
Atomic percent silver
°C
°F
10
20
30
40
50
60
70
80 90
1100
1084.5
1900
1000
961.93
1700
900
L+a
1600
L+B
800
780
1400
7.9
719
91.2
700
1200
600
a+B
1000
500
850
400
Cu
10
30
40
50
60
70
80
90
Ag
Weight percent silver
20
A 50%Ni-50%Cu alloy is slowly cooled from 1400°C to 1200°C. Determine: At 1300°C, estimate the weight fractions of the solid and liquid.
Chapter 5 Solutions
Foundations of Materials Science and Engineering
Ch. 5.7 - Prob. 1KCPCh. 5.7 - Write an equation for the number of vacancies...Ch. 5.7 - Prob. 3KCPCh. 5.7 - Prob. 4KCPCh. 5.7 - Describe the substitutional and interstitial...Ch. 5.7 - Prob. 6KCPCh. 5.7 - What factors affect the diffusion rate in solid...Ch. 5.7 - Write the equation for Ficks second law of...Ch. 5.7 - Prob. 9KCPCh. 5.7 - Prob. 10KCP
Ch. 5.7 - (a) Calculate the equilibrium concentration of...Ch. 5.7 - Prob. 12AAPCh. 5.7 - Determine the diffusion flux of zinc atoms in a...Ch. 5.7 - The diffusion flux of copper solute atoms in...Ch. 5.7 - Prob. 15AAPCh. 5.7 - Prob. 16AAPCh. 5.7 - Prob. 17AAPCh. 5.7 - A gear made of 1020 steel (0.20 wt% C) is to be...Ch. 5.7 - Prob. 19AAPCh. 5.7 - The surface of a steel gear made of 1020 steel...Ch. 5.7 - Prob. 21AAPCh. 5.7 - If boron is diffused into a thick slice of silicon...Ch. 5.7 - Prob. 23AAPCh. 5.7 - Prob. 24AAPCh. 5.7 - Prob. 25AAPCh. 5.7 - Prob. 26AAPCh. 5.7 - Prob. 27AAPCh. 5.7 - Prob. 28AAPCh. 5.7 - Prob. 29AAPCh. 5.7 - Prob. 30AAPCh. 5.7 - The diffusivity of copper atoms in the aluminum...Ch. 5.7 - Prob. 32AAPCh. 5.7 - Prob. 33SEPCh. 5.7 - Prob. 34SEPCh. 5.7 - Prob. 37SEPCh. 5.7 - Prob. 38SEPCh. 5.7 - The activation energy of nickel atoms in FCC iron...Ch. 5.7 - Prob. 40SEPCh. 5.7 - The self-diffusion of iron atoms in BCC iron is...Ch. 5.7 - Would you expect the diffusion rate of copper...Ch. 5.7 - Would you expect the diffusion rate of copper...Ch. 5.7 - Prob. 44SEPCh. 5.7 - Prob. 45SEPCh. 5.7 - Prob. 46SEPCh. 5.7 - Prob. 47SEPCh. 5.7 - Prob. 48SEPCh. 5.7 - Prob. 49SEPCh. 5.7 - Prob. 50SEP
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