Journal
CORROSION SCIENCE
Volume 209, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110798
Keywords
NiAl; Oxidation; Grain boundary; NanoSIMS; APT
Funding
- National Science Foundation (NSF) [DMR-1352157, CMMI-1729166]
- University of Michigan Center for Materials Characterization
- Lawrence Livermore National Laboratory (LLNL) Laboratory Directed Research and Development project [20-SI-04]
- U.S. Department of Energy [DE-AC52-07NA27344]
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The oxidation resistance of Ni-based alloys is typically improved by additions of elements segregating to grain boundaries, contributing to reducing scale growth, and improving scale adherence. Doped alloys exhibited varying reductions in oxidation rates and Al and O fluxes affecting scale grain morphologies, with Ti+Y co-doping further reducing the outward Al and inward O transport compared to doping with Ti or Y alone.
The oxidation resistance of Ni-based alloys is typically improved by additions of elements segregating to grain boundaries, contributing to reducing scale growth, and improving scale adherence. To develop a mechanistic understanding of doping, outward Al and inward O fluxes through the scale formed on beta-NiAl with Ti, Y, and Ti+Y additions were characterized for oxidation at 1200 degrees C and times up to 100 h. Doped alloys exhibited varying reductions in oxidation rates and Al and O fluxes affecting scale grain morphologies. Ti+Y co-doping further reduced the outward Al and inward O transport compared to doping with Ti or Y alone.
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