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Abstract
The surface and subsurface compositional changes of Cu-Ni alloys with different stoichiometries were studied in situ using 5 keV Ar ion sputtering and X-ray photoelectron spectroscopy. The altered layer formed at room temperature exhibits enrichment of Cu-atoms at the surface due to segregation phenomena and diffusion. The size of the effect depends on the initial composition of the alloy. Additional information on the elemental depth distribution was obtained by varying the photoelectron take-off angle. Modeling of the preferential sputtering of Cu-atoms and of the depth distributions was also carried out. The simulations allowed to distinguish between the temperature and ballistic effects during the ion beam bombardment.
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