Correlative atom-probe tomography and transmission electron microscope study of a chemical transition in a spinel on an oxidized nickel-based superalloy

Complex thermally grown oxides (TGOs) are formed on a single-crystal Ni-based superalloy due to a large fraction of alloying elements. Combining atom-probe tomography and transmission electron microscopy analyses, the three-dimensional elemental distributions of metal oxides of the spinel and refrac...

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Bibliographic Details
Published in:Scripta materialia 2013-06, Vol.68 (11), p.909-912
Main Authors: Baik, Sung-Il, Yin, Xin, Seidman, David N.
Format: Article
Language:English
Subjects:
Atom-probe tomography
Metal oxides
Ni-based superalloy
Nickel
Oxides
Spinel
Superalloys
Tantalum oxides
Three dimensional
Tomography
Transmission electron microscopy
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Summary:Complex thermally grown oxides (TGOs) are formed on a single-crystal Ni-based superalloy due to a large fraction of alloying elements. Combining atom-probe tomography and transmission electron microscopy analyses, the three-dimensional elemental distributions of metal oxides of the spinel and refractory metal-oxide regions are presented. A spinel-type oxide, Ni(Cr,Al)2O4, is formed with a crystallographic orientation relationship with the alloy substrate, which decomposes into other oxides. The sequence of oxides observed in the TGO are NiO→Cr2O3→Ta2O5→NiTaO4, NiTa2O6→Ni(Cr,Al)2O4→Al2O3.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2013.02.025