Grain Boundary Chemistry and Transport Through Alumina Scales on NiAl Alloys

Boll, Torben; Unocic, Kinga A.; Pint, Bruce A.; Mårtensson, Anders; Stiller, Krystyna

doi:10.1007/s11085-016-9697-x

Grain Boundary Chemistry and Transport Through Alumina Scales on NiAl Alloys

Journal Article · Wed Jan 11 23:00:00 EST 2017 · Oxidation of Metals

DOI:https://doi.org/10.1007/s11085-016-9697-x· OSTI ID:1394535

^[1]; ^[2]; ^[2]; Mårtensson, Anders ^[3]; Stiller, Krystyna ^[1]

Chalmers Univ. of Technology,Goteborg (Sweden). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Chalmers Univ. of Technology,Goteborg (Sweden). Dept. of Applied Chemistry

It is widely accepted that the growth of protective α-Al₂O₃ scales on Ni-based alloys is governed by the inward diffusion of oxygen through the oxide grain boundaries (GB). However, there is also some outward diffusion of metal ions to the surface, but it is difficult to quantify. Here in this work we apply atomic force microscopy, scanning electron microscopy and transmission electron microscopy to investigate the outward flux of Al, which manifests as the growth of small ridges along the alumina GBs after the removal of the outermost oxide layer by mechanical polishing or focused ion beam techniques followed by additional oxidation. As a model alumina-former, NiAl with Hf and Zr additions was investigated. In comparison to Zr, Hf was found to reduce the outward Al diffusion. This outward diffusion was six orders of magnitude smaller than the O inward diffusion.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1394535

Journal Information:: Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 3-4 Vol. 88; ISSN 0030-770X

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Effect of Titanium Addition on Alumina Growth Mechanism on Yttria-Containing FeCrAl-Base Alloy Huang, Taihong; Naumenko, Dmitry; Song, Peng Oxidation of Metals, Vol. 90, Issue 5-6 https://doi.org/10.1007/s11085-018-9861-6	journal	August 2018
Microstructural Investigation of the Thermally Grown Oxide on Grain-Refined Overdoped NiAl–Zr White, Rachel; Weaver, Mark Oxidation of Metals, Vol. 92, Issue 3-4 https://doi.org/10.1007/s11085-019-09920-2	journal	July 2019
Transition metal attenuated mechanism for protective alumina formation from first principles Babic, Vedad; Geers, Christine; Panas, Itai RSC Advances, Vol. 8, Issue 72 https://doi.org/10.1039/c8ra08195f	journal	January 2018

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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