1. At what temperature will the diffusion coefficient for the diffusion of copper in nickel have a value of 6.5 10-17 m2/s? Use the diffusion data in Table 5.2.

Diffusing Species Q_(J/mol) 87,400 c Nb 148,000 77,000 168,000 NC Fe Fe Cu" Host Metal D (m/s) Interstitial Diffusion Fe (a or BCC) 1.1 x 10-6 Fe (y or FCC)" 2.3 X 10-5 Fe (a or BCC) 5.0 X 107 Fe (y or FCC) 9.1 x 10-5 Self-Diffusion Fe (a or BCC) 2.8 X 10-4 Fe (y or FCC)" 5.0 X 105 Cu (FCC) 2.5 X 105 Al (FCC) 2.3 X 10-4 Mg(HCP) Zn (HCP) 1.5 X 10-5 Mo (BCC) 1.8 X 10-4 Ni (FCC) 1.9 X 104 Interdiffusion (Vacancy) Cu (FCC) 2.4 x 105 Zn (HCP) 2.1 X 10-4 AI (FCC) 6.5 X 10-5 AI (FCC) 1.2 x 104 Ni (FCC) 2.7 x 10-5 Cu (FCC) 1.9 X 10-4 251,000 284,000 200,000 144,000 136,000 94,000 AI Mg Zn 1.5 X 10-4 Mo 461,000 Nid 285,000 Zn Cu Cu Mg Cu Nic 189,000 124,000 136,000 130,000 256,000 230,000