Journal
OXIDATION OF METALS
Volume 57, Issue 3-4, Pages 217-230Publisher
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/A:1014818117073
Keywords
TEM; Cr2O3; NiO; oxidation; microstructure; grain boundary
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The oxidation behavior of alloy grain boundaries in model Ni-Cr alloys was investigated. Two binary alloys with nominal wt.% compositions of Ni-10Cr and Ni-20Cr were used. Oxidation was performed in air for 50 hr at 1000degreesC. The grain boundaries intersecting the alloy surface in Ni-10Cr did not exhibit oxidation, whereas the alloy formed a thick (approximate to60 mum) oxide layer which formed inwardly. The grain boundaries in this alloy showed a passivating influence at the adjacent regions and retarded oxide formation. An examination of the Ni-20Cr cross section revealed preferential oxidation to a depth of 65 mum at the alloy grain boundaries intersecting its surface, while the oxide at the surface was a few micrometers thick. It is noted that the extent to which the grain-boundary oxidation differs from the alloy surface oxidation depends on the Cr content of the alloy. It is also considered that the grain-boundary oxidation behavior in different Ni-Cr alloys changes as a function of Cr content.
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