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Title: Grain boundary depletion and migration during selective oxidation of Cr in a Ni-5Cr binary alloy exposed to high-temperature hydrogenated water

High-resolution microscopy of a high-purity Ni-5Cr alloy exposed to 360°C hydrogenated water reveals intergranular selective oxidation of Cr accompanied by local Cr depletion and diffusion-induced grain boundary migration (DIGM). The corrosion-product oxide consists of a porous, interconnected network of Cr2O3 platelets with no further O ingress into the metal ahead. Extensive grain boundary depletion of Cr (to <0.05at.%) is observed typically 20–100 nm wide as a result of DIGM and reaching depths of many micrometers beyond the oxidation front.
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Publication Date:
OSTI Identifier:
Report Number(s):
47700; 48207; KC0202040
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Scripta Materialia, 89:41-44
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
Country of Publication:
United States
NICKEL ALLOYS; CORROSION; OXIDATION; nickel alloys; corrosion; oxidation; grain boundary diffusion; diffusion-induced grain boundary migration (DIGM); atom probe tomography (APT); transmission electron microscopy (TEM); Environmental Molecular Sciences Laboratory