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First steps of the Ni–20 Cr alloy oxidation studied by Auger electron microprobe
Author(s) -
Schmitt J. F.,
Pacia N.,
Pigeat P.,
Weber B.
Publication year - 1992
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740181202
Subject(s) - electron microprobe , alloy , microprobe , chromium , auger , oxide , auger electron spectroscopy , microanalysis , argon , crystallite , analytical chemistry (journal) , materials science , metallurgy , sputtering , chemistry , scanning electron microscope , electron probe microanalysis , mineralogy , thin film , composite material , nanotechnology , atomic physics , physics , organic chemistry , chromatography , nuclear physics
Polycrystalline 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.