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NiAl Oxidation Reaction Processes Studied In Situ Using MEMS-Based Closed-Cell Gas Reaction Transmission Electron Microscopy

Journal Article · · Oxidation of Metals
The nanoscale oxidation mechanisms and kinetics of a model β-NiAl system were investigated using in situ closed-cell gas reaction scanning transmission electron microscopy (STEM). Here, we directly visualize the dynamic structural and chemical changes that occur during high-temperature oxidation at a high spatial resolution of 50.3Ni–49.7Al (at.%) nanoparticles under static air conditions at 730 Torr with heating up to 750 °C at 5 °C/s. A MEMS-based gas cell system, with microfabricated heater devices and a gas delivery system, was used to reveal site-specific oxidation initiation sites. Through time-resolved annular dark-field STEM imaging, we tracked the nanoscale oxidation kinetics of Al2O3. After oxidation at 750 °C, nucleation of voids at the Ni/Al2O3 interface was observed along a NiAl grain boundary, followed by the formation of faceted NiO crystals. Small faceted cubic crystals of NiO were formed at the initial stage of oxidation at high PO2 due to the outward self-diffusion of Ni2+ ions, followed by the formation of a mixture of metastable and stable α-Al2O3 at the oxide/metal interface that is attributed to a PO2 decrease with oxidation time, which agreed with thermodynamic modeling calculations. Furthermore, the results from these in situ oxidation experiments in the β-NiAl system are in agreement with the established oxidation mechanisms; however, with in situ closed-cell gas microscopy it is now feasible to investigate nanoscale oxidation mechanisms and kinetics in real time and at high spatial resolution and can be broadly applied to understand the basic high-temperature oxidation mechanisms for a wide range of alloy compositions.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1394581
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

References (21)

Segregation studies of oxidized Y and Zr doped NiAl journal April 1995
The effect of Y and Zr on the Oxidation of NiAl journal November 1996
High Temperature Materials Based on the Intermetallic Compound NiAl Reinforced by Refractory Metals for Advanced Energy Conversion Technologies journal July 2008
18O/SIMS characterization of the growth mechanism of doped and undoped ?-Al2O3 journal April 1993
TEM studies of oxidized NiAl and Ni3Al cross sections journal June 1989
On the formation of interfacial and internal voids inα-Al2O3 scales journal October 1997
The effect of various oxide dispersions on the phase composition and morphology of Al2O3 scales grown on β-NiAl journal February 1997
Transient oxidation of Single-Crystal β-NiAl journal March 1989
Characterization of alumina interfaces in TBC systems journal April 2009
The oxidation behaviour of NiAl-I. Phase transformations in the alumina scale during oxidation of NiAl and NiAl-Cr alloys journal November 1992
The oxidation of NiAl-III. Internal and intergranular oxidation journal January 1994
Z-contrast stem for materials science journal June 1989
Transient oxidation of Ni-base alloys journal July 1970
Oxidation of NiAl and FeAl journal October 1999
Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope journal April 2014
Novel MEMS-Based Gas-Cell/Heating Specimen Holder Provides Advanced Imaging Capabilities for In Situ Reaction Studies journal July 2012
Controlled In Situ Gas Reaction Studies of Catalysts at High Temperature and Pressure with Atomic Resolution journal August 2014
Computer-Controlled In Situ Gas Reactions via a MEMS-based Closed-Cell System journal August 2015
Direct in Situ TEM Observation of Modification of Oxidation by the Injected Vacancies for Ni–4Al Alloy Using a Microfabricated Nanopost journal July 2015
Oxidation induced lifetime limits of thin walled, iron based, alumina forming, oxide dispersion strengthened alloy components journal February 1994
Oxidation induced lifetime limits of thin walled, iron based, alumina forming, oxide dispersion strengthened alloy components journal February 1994

Cited By (2)

In Situ S/TEM Reduction Reaction of Ni-Mo2C Catalyst for Biomass Conversion journal August 2018
Thermally Introduced Bismuth Clustering in Ga(P,Bi) Layers under Group V Stabilised Conditions Investigated by Atomic Resolution In Situ (S)TEM journal June 2018

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