Tracer diffusion of 60Co and 63Ni in amorphous NiZr alloy

Tracer diffusion of 60Co and 63Ni in the amorphous alloy NiZr near the equiatomic composition has been measured in the temperature range between 486 and 641 K using the ion-beam sputter-sectioning technique for serial sectioning. The temperature dependence for the diffusivities of Co and Ni in a-NiZr exhibit Arrhenius behavior; these can be expressed as follows: D/sup *//sub Co/ = 3.6 x 10-7 exp[-(135 +- 14) kJ mol-1/RT] m2/s and D/sup *//sub Ni/ = 1.7 x 10-7 exp[-(140 +- 9) kJ mol-1/RT] m2/s. The values of D/sup *//sub Ni/ are in good agreement with those measured by the Rutherford backscattering technique. The measured diffusivities were independent of time, indicating that no relaxation took place during diffusion