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X-ray diffraction (XRD), auger electron spectroscopy (AES), and X-ray photoelectron spectroscopy (XPS) were used tocharacterize the surface properties of the N+-ion-implanted TiNi alloy. There is a high nitrogen content region at the outermost surfaceof the N+-ion-implanted TiNi alloy. The detected nitrogen exists mainly in the form of TiN. Small amounts of Ti3O5 and TiO2 also existon the surface of the N+-ion-implanted TiNi sample. The modified layer of the N+-ion-implanted sample can work as an obstacle layerof the nickel’s dissolution, which obstructs Ni dissolving from the TiNi surface effectively.
X-ray diffraction (XRD), and au-ray electron spectroscopy (AES), and X-ray photoelectron spectroscopy (XPS) were used to characterize the surface properties of the N + -ion- implanted TiNi alloy. There is a high nitrogen content region at the outermost Surface of the N + -ion-implanted TiNi alloy. The detected nitrogen exists mainly in the form of TiN. Small amounts of Ti3O5 and TiO2 also existon the surface of the N + -ion- implanted TiNi sample. The modified layer of the N + -ion- implanted sample can work as an obstacle layer of the nickel's dissolution, which obstructs ni dissolving from the TiNi surface effectively.