In-situ XRD investigations of FeAl intermetallic phase-based alloy oxidation. (March 2020)

• Record Type: Journal Article
• Authors: Cebulski, Janusz; Pasek, Dorota; Bik, Maciej; Świerczek, Konrad; Jeleń, Piotr; Mroczka, Krzysztof; Dąbrowa, Juliusz; Zajusz, Marek; Wyrwa, Jan; Sitarz, Maciej
• Is Part Of: Corrosion science. Volume 164(2020)
• Publication Date: 2020-03
• Subjects: A. Alloy -- B. XRD -- B. SEM -- B. Raman spectroscopy -- C. High temperature oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108344
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The oxidation behaviour of a FeAl intermetallic phase-based alloy was determined. The formation of Fe oxides was noticed at a lower temperature range (400−700 °C). The following γ → θ → α sequence of Al2O3 phase transitions was observed. The partial spallation of the Al2O3 scale was noticed during the in-situ oxidation. Abstract: The oxidation behavior of FeAl-based Fe40Al5Cr0.2TiB alloy is investigated by the high-temperature in-situ X-ray diffraction performed in air, in temperature range of 100−1150 °C. Complex oxidation behavior, with the formation of different Fe oxides and phase transformation of the alloy substrate in 400−700 °C is reported. Oxidation at higher temperatures leads to the formation of Al2 O3 and its subsequent phase transitions (γ → θ → α). Relatively higher thermal expansion of the alloy with respect to the alumina scale results in the spallation of the latter.