期刊
SCRIPTA MATERIALIA
卷 68, 期 11, 页码 909-912出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.02.025
关键词
Ni-based superalloy; Metal oxides; Spinel; Transmission electron microscopy; Atom-probe tomography
类别
资金
- NSF-MRI [DMR-0420532]
- ONR-DURIP [N00014-0400798, N00014-0610539, N00014-0910781]
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)(2)O-4, 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)(2)O-4 -> Al2O3. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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