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Question 3 of 6 5.55 / 11.1 TII Current Attempt in Progress Your answer is partially correct. Using the Tabulation of Diffusion Data, answer the following: (a) Calculate the diffusion coefficient for Cu in Al at 520C. 7.15E-14 m2/s (Use scientific notation.) (b) What time (in h) will be required at 640C to produce the same diffusion result (in terms of concentration at a specific point) as for 12 h at 520C? i 0.863 Diffusing Species Fe Tabulation of Diffusion Data 1 Host Metal D. (m/s) a-Fe 2.8 x 10-4 (BCC) y-Fe 5.0 x 10-5 (FCC) a-Fe 6.2 x 10-7 Activation Energy Od kJ/mol eV/atom 251 2.60 Fe 284 2.94 80 0.83 7-Fe 2.3 x 10-5 148 1.53 Calculated Values T(C) D(m/s) 500 3.0 x 10-21 900 1.8 X 10-15 900 1.1 x 10-17 1100 7.8 x 10-16 500 2.4 x 10-12 900 1.7 x 10-10 900 5.9 x 10-12 1100 5.3 X 10-11 500 4.2 x 10-19 500 4.0 x 10-18 500 4.2 x 10-14 500 4.1 x 10-14 500 1.9 X 10-13 500 1.3 x 10-22 Cu Zn 7 7 7 Z Cu Cu Ni 7.8 x 10-5 2.4 x 10-5 2.3 x 10-4 6.5 x 10-5 1.2 x 10-4 2.7 x 10-5 211 189 144 136 131 256 2.19 1.96 1.49 1.41 1.35 2.65 Cu Mg Cu