DIFFUSION OF Ni63 IN IRON, COBALT, NICKEL, AND TWO IRON–NICKEL ALLOYS

The self-diffusion of nickel and the diffusion of Ni 63 into iron, cobalt, and two iron–nickel alloys was studied using the technique of decrease in surface activity, The nickel self-diffusion results are compared to previously reported values. Nickel is found to diffuse more slowly than iron in the iron-rich portion of the iron–nickel system. The rate of nickel diffusion increases with increasing nickel content. A comparison is made between the present results for diffusion of Ni 63 into iron, cobalt, and nickel with reported values for diffusion of Co 60 and Fe 59 in the same metals. In each solvent, the magnitudes of the activation energies, Q, are such that Q Ni > Q Co > Q Fe .