Using the Tabulation of Diffusion Data, answer the following: (a) Calculate the diffusion coefficient for Cu in Ni at 550°C. m²/s (Use scientific notation.) (b) What time (in h) will be required at 610°C to produce the same diffusion result (in terms of concentration at a specific point) as for 12 h at 550°C? Diffusing Species Fe Fe C C 85 2820 Mg Tabulation of Diffusion Data Host Metal a-Fe (BCC) y-Fe (FCC) a-Fe -Fe Cu Al Al Al Ni D.(m²/s) 2.8 x 10-4 5.0 x 10-5 6.2 x 10-7 23 x 10-5 7.8 x 10-5 24 x 10-³ 2.3 x 10-4 6.5 x 10-5 1.2 x 10- 2.7 x 10-5 Activation Energy Q kJ/mol 251 284 80 148 211 189 144 136 131 256 eV/atom 2.60 2.94 0.83 1.53 2.19 1.96 1.49 1.41 1.35 2.65 Calculated Values T(°C) 500 900 900 1100 500 900 900 1100 500 500 500 500 500 500 D(m²/s) 3.0 x 10-21 1.8 x 10-15 1.1 x 10-17 7.8 x 10-16 2.4 x 10-12 1.7 x 10-10 5.9 x 10-12 5.3 x 10-11 4.2 x 10-19 4.0 x 10-1 4.2 x 10-14 4.1 x 10-14 1.9 x 10-¹ 1.3 x 10-22 Cu Source: E. A. Brandes and G. B. Brook (Editors), Smithells Metals Reference Book, 7th edition, Butterworth- Heinemann, Oxford, 1992.
Using the Tabulation of Diffusion Data, answer the following: (a) Calculate the diffusion coefficient for Cu in Ni at 550°C. m²/s (Use scientific notation.) (b) What time (in h) will be required at 610°C to produce the same diffusion result (in terms of concentration at a specific point) as for 12 h at 550°C? Diffusing Species Fe Fe C C 85 2820 Mg Tabulation of Diffusion Data Host Metal a-Fe (BCC) y-Fe (FCC) a-Fe -Fe Cu Al Al Al Ni D.(m²/s) 2.8 x 10-4 5.0 x 10-5 6.2 x 10-7 23 x 10-5 7.8 x 10-5 24 x 10-³ 2.3 x 10-4 6.5 x 10-5 1.2 x 10- 2.7 x 10-5 Activation Energy Q kJ/mol 251 284 80 148 211 189 144 136 131 256 eV/atom 2.60 2.94 0.83 1.53 2.19 1.96 1.49 1.41 1.35 2.65 Calculated Values T(°C) 500 900 900 1100 500 900 900 1100 500 500 500 500 500 500 D(m²/s) 3.0 x 10-21 1.8 x 10-15 1.1 x 10-17 7.8 x 10-16 2.4 x 10-12 1.7 x 10-10 5.9 x 10-12 5.3 x 10-11 4.2 x 10-19 4.0 x 10-1 4.2 x 10-14 4.1 x 10-14 1.9 x 10-¹ 1.3 x 10-22 Cu Source: E. A. Brandes and G. B. Brook (Editors), Smithells Metals Reference Book, 7th edition, Butterworth- Heinemann, Oxford, 1992.
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Transcribed Image Text:erm 1
Question 12 of 14
Using the Tabulation of Diffusion Data, answer the following:
(a) Calculate the diffusion coefficient for Cu in Niat 550°C.
m²/s (Use scientific notation.)
Diffusing
Species
Fe
Fe
(b) What time (in h) will be required at 610°C to produce the same diffusion result (in terms of concentration at a specific point) as
for 12 h at 550°C?
C
< >
C
Cu
Zn
Al
Cu
Mg
Cu
Tabulation of Diffusion Data
Host
Metal
a-Fe
(BCC)
y-Fe
(FCC)
a-Fe
y-Fe
ठठ
h
Al
Al
Al
Ni
Do(m²/s)
2.8 x 10-4
5.0 × 10-5
6.2 x 10-7
2.3 x 10-5
7.8 x 10-5
2.4 x 10-
2.3 x 10-4
6.5 x 10-5
1.2 x 10-
2.7 x 10-5
Activation Energy Qa
eV/atom
2.60
kJ/mol
251
284
80
148
211
189
144
136
131
256
2.94
0.83
1.53
2.19
1.96
1.49
1.41
1.35
2.65
Calculated Values
T(°C)
500
900
900
1100
500
900
900
1100
500
500
-/15 E
500
500
500
500
D(m²/s)
3.0 x 10-21
1.8 x 10-15
1.1 x 10-17
7.8 x 10-16
2.4 x 10-12
1.7 x 10-10
5.9 x 10-12
5.3 x 10-11
4.2 x 10-19
4.0 x 10-IN
4.2 x 10-14
4.1 x 10-14
1.9 x 10-1
1.3 x 10-22
***
Source: E. A. Brandes and G. B. Brook (Editors), Smithells Metals Reference Book, 7th edition, Butterworth-
Heinemann, Oxford, 1992.
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