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A bar of pure nickel is coupled with a bar of pure iron (interfaced). The diffusion couple is then heated to a temperature of 1000°C. (a) How long will it take for the concentration of nickel to reach 0.1 wt%, 1.0 μm below the interface? (b) How long will it take for the concentration of nickel to reach 0.1 wt%, 1.0 mm below the interface? (c) What does the comparison of the two answers show?

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