In-situ transmission electron microscopy study of surface oxidation for Ni-10Cr and Ni-20Cr alloys

SCRIPTA MATERIALIA

卷:114

Article

Luo, Langli¹  Zou, Lianfeng^2,3  Schreiber, Daniel K.⁴  Baer, Donald R.¹  Bruemmer, Stephen M.⁴  Zhou, Guangwen^2,3  Wang, Chong-Min¹ 

[1] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA

[2] SUNY Binghamton, Dept Mech Engn, Binghamton, NY 13902 USA

[3] SUNY Binghamton, Multidisciplinary Program Mat Sci & Engn, Binghamton, NY 13902 USA

[4] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA

关键词: Ni-Cr;    Oxidation;    Oxidation kinetics;    Environmental TEM;   

DOI  :  10.1016/j.scriptamat.2015.11.031

来源: Elsevier

【 摘 要 】

The early-stage oxidation of Ni (001) thin films alloyed with 10 or 20 at.% Cr at 700 degrees C has been directly visualized using in-situ TEM. Independent of Cr concentration, the oxidation initiates via nucleation of surface NiO islands and subsurface Cr2O3. The NiO grows and transitions into a continuous film, followed by the nucleation and growth of NiCr2O4 islands. For Ni-20 at.% Cr, a continuous Cr2O3 was developed, but not for Ni-10 at.% Cr. NiO whiskers are observed to preferentially nucleate/grow from the NiCr2O4 islands through a short-circuit diffusion of Ni along the NiCr2O4 interfaces in Ni-10 at.% Cr. (C) 2015 Scripta Materialia. Published by ELSEVIER Ltd. All rights reserved.

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