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2. Consider a copper-nickel diffusion couple. Anter a 700 - h heat treatment at 1100C, the concentration of Cu is 2.5wt% at the 3.0 -

2. Consider a copper-nickel diffusion couple. Anter a 700 - h heat treatment at 1100C, the concentration of Cu is 2.5wt% at the 3.0 - mm position within the nickel. At what temperature should the diffusion couple be maintained to produce the same concentration (i.e., 2.5w%Cu) at a 2.0-mm position after 700h ? (10 Marks)

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