Abstract
AbstractPolycrystalline Ni‐20 Cr alloy ribbons were studied after low‐pressure oxidation (3.3 × 10−4 Pa) at 750° C by scanning Auger microanalysis with argon ion sputter profiling. Only chromium oxide is formed under our experimental conditions and a 10% mechanical predeformation (uniaxial deformation) at ambient temperature is found to promote strongly the oxide formation on the alloy surface. In effect, it notably reduces the incubation period that precedes all our oxidations. However, the presented analysis reveals that the chromium oxide distribution is very heterogenous on predeformed oxidized samples at the beginning of the reaction.
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