Abstract
Radiation-enhanced diffusion and ion-beam mixing in Ni/Zr diffusion couples were investigated. The Kirkendall geometry was employed for this experiment to determine the radiation-enhanced diffusivities of both Ni and Zr in the amorphous (a-) NiZr interdiffusion zone. W, Au, and Hf were employed as markers. The activation enthalpy for radiation-enhanced interdiffusion was determined to be ≊0.4 eV, and Ni was found to be the faster moving species. The dose-rate dependence of the interdiffusion coefficient in the a-NiZr was typical of that of crystalline materials and suggests a point-defect-like diffusion mechanism in irradiated metallic glasses.
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