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(12) Nickel (Ni) is to be diffused into pure copper at 675C. If the surface concentration is maintained to be 0.2wt%Ni, what will be the

image text in transcribed (12) Nickel (Ni) is to be diffused into pure copper at 675C. If the surface concentration is maintained to be 0.2wt%Ni, what will be the concentration 2mm from the surface after 25h ? The diffusion coefficient for nickel in copper at 675C is 1.91011 m2/s

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