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
-
- Imashuku Susumu
- Institute for Materials Research, Tohoku University
-
- Fukumoto Michihisa
- Graduate School of Engineering Science, Akita University
-
- Nakajima Kano
- Graduate School of Engineering Science, Akita University
-
- Suzuki Shigeru
- Micro System Integration Center, in MaSC, Tohoku University
抄録
<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>
収録刊行物
-
- ISIJ International
-
ISIJ International 62 (9), 1881-1886, 2022-09-15
一般社団法人 日本鉄鋼協会
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390856384290337536
-
- ISSN
- 13475460
- 09151559
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- Crossref
-
- 抄録ライセンスフラグ
- 使用不可