Characterization of <i>α</i>-Al<sub>2</sub>O<sub>3</sub> in Structural Isomers of Alumina Formed by Oxidation of Fe–Cr–Al Alloys
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- Imashuku Susumu
- Institute for Materials Research, Tohoku University
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- Fukumoto Michihisa
- Graduate School of Engineering Science, Akita University
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- Nakajima Kano
- Graduate School of Engineering Science, Akita University
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- Suzuki Shigeru
- Micro System Integration Center, in MaSC, Tohoku University
Abstract
<p>To understand the formation of structural isomers of alumina (Al2O3) on the surfaces of Fe–Cr–Al alloys, cathodoluminescence (CL), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were used. The alloys were annealed under oxygen at a low partial pressure to focus on the initial formation of Al2O3. XRD revealed that corundum (α-Al2O3) was predominantly formed on the alloy surfaces after annealing at approximately 1100°C, whereas γ-Al2O3 and θ-Al2O3 were formed at 1000°C. CL peaks around 700 nm, which originated from Cr3+ ions in Al2O3, was drastically increases by rising the annealing temperatures from 1000 to 1100°C because of the increase of the chromium content in the Al2O3 scales that was revealed by XPS. EPMA revealed that the surficial α-Al2O3 had striped patterns, which were similar to those observed using CL imaging, indicating that CL can be conveniently used for imaging α-Al2O3 and analyzing the inhomogeneous distribution of α-Al2O3 on the alloys.</p>
Journal
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- ISIJ International
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ISIJ International 62 (9), 1881-1886, 2022-09-15
The Iron and Steel Institute of Japan
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Details 詳細情報について
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- CRID
- 1390856384290337536
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- ISSN
- 13475460
- 09151559
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
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- Abstract License Flag
- Disallowed