We present for the first time experimental evidence for solute Ni segregation to the surface in Ni-Cu alloys where it has been generally believed that Cu atoms always segregate to the surface in agreement with various theories. A new insight is needed in surface segregation in order to account for our observation of Ni segregation in Ni_1-x{Cu}ₓ$ alloys where x is in a range 0.84 to 1.0.
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Сакурай et al. (1985) studied this question.