The oxidation of six Cu-xNi alloys (x = 0.2, 0.6, 1, 2, 3, 4 at.%) was studied at 800 degrees C under 1 atm O-2. All of the binary Cu-Ni alloys underwent an internal oxidation of Ni in the presence of an external scale of Cu2O and CuO, in agreement with the theoretical expectations for a finite range of Ni contents. However, the behavior of internal oxidation deviates significantly from the classical behavior of internal oxidation described by Wagner, in particular for the absence of a well-defined front of internal oxidation.
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