Corrosion resistance and magnetostrictive properties of (Tb0.3Dy0.7)Fe2 alloy modified by nitrogen ion implantation

The corrosion resistance and magnetostriction of (Tb0.3Dy0.7)Fe2 alloy were investigated for different nitrogen doses of 5×1015, 5×1016, 5×1017, 1×1018 ions/cm2 and average ion energy of 140 kV. The phase and elements concentration in the implanted layer were examined by X-ray diffraction and auger electron spectroscopy, respectively. The aqueous corrosion studies were carried out in 3.5% NaCl solutions. It was found that corrosion resistance had improved substantially with respect to the untreated substrates. The corrosion resistance was maximum at a dose of 5×1017 ions/cm2, and saturation in corrosion improvement was noticed at a higher dose, 10×1017 ions/cm2. In contrast, the results of magnetostriction tests before and after ion implantation showed that the influence of nitrogen ion implantation on the magnetostrictive properties turned out to be small. Finally, a model was applied to interpret the influ ence of nitrogen implantation on the magnetostriction in the light of the information provided by the experimental results in this study.

XRD patterns of the samples before and after ion implantation of nitrogen ions with different dosesFigure optionsDownload full-size imageDownload as PowerPoint slide