The oxidation of an equimolar FeCoNiAl medium-entropy alloy at 900 °C in various oxygen pressures

Wu Kai; Yi-rong Yang; Wun-jhen Yu; Rong-tan Huang; Shaofei Liu; Ji-jung Kai

doi:10.1016/j.corsci.2023.111560

The oxidation of an equimolar FeCoNiAl medium-entropy alloy at 900 °C in various oxygen pressures

Wu Kai^*
, Yi-rong Yang
, Wun-jhen Yu
, Rong-tan Huang
, Shaofei Liu
, Ji-jung Kai

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

3 Citations (Scopus)

Abstract

The oxidation of an equimolar FeCoNiAl medium-entropy alloy was studied at 900 °C in various O₂-containing atmospheres over the oxygen pressure range of 10–10⁵ Pa. The alloy oxidized parabolically, having its oxidation rates steadily increasing with oxygen pressure. Duplex scales formed on the oxidized substrate, consisting of an outer CoFe₂O₄ layer and an inner α-Al₂O₃ layer. The position of the Pt-marker was located at the outer- and inner-layer boundary, demonstrating that the outward cation diffusion controlled the formation of CoFe₂O₄, while the growth of Al₂O₃ was contributed by the inward oxygen diffusion. © 2023 Elsevier Ltd.

Original language	English
Article number	111560
Journal	Corrosion Science
Volume	224
Online published	27 Sept 2023
DOIs	https://doi.org/10.1016/j.corsci.2023.111560
Publication status	Published - Nov 2023

Research Keywords

A. medium-entropy alloy
B. SEM
B. TEM
C. oxides

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title = "The oxidation of an equimolar FeCoNiAl medium-entropy alloy at 900 °C in various oxygen pressures",

abstract = "The oxidation of an equimolar FeCoNiAl medium-entropy alloy was studied at 900 °C in various O2-containing atmospheres over the oxygen pressure range of 10–105 Pa. The alloy oxidized parabolically, having its oxidation rates steadily increasing with oxygen pressure. Duplex scales formed on the oxidized substrate, consisting of an outer CoFe2O4 layer and an inner α-Al2O3 layer. The position of the Pt-marker was located at the outer- and inner-layer boundary, demonstrating that the outward cation diffusion controlled the formation of CoFe2O4, while the growth of Al2O3 was contributed by the inward oxygen diffusion. {\textcopyright} 2023 Elsevier Ltd.",

keywords = "A. medium-entropy alloy, B. SEM, B. TEM, C. oxides",

author = "Wu Kai and Yi-rong Yang and Wun-jhen Yu and Rong-tan Huang and Shaofei Liu and Ji-jung Kai",

year = "2023",

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doi = "10.1016/j.corsci.2023.111560",

language = "English",

volume = "224",

journal = "Corrosion Science",

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T1 - The oxidation of an equimolar FeCoNiAl medium-entropy alloy at 900 °C in various oxygen pressures

AU - Kai, Wu

AU - Yang, Yi-rong

AU - Yu, Wun-jhen

AU - Huang, Rong-tan

AU - Liu, Shaofei

AU - Kai, Ji-jung

PY - 2023/11

Y1 - 2023/11

N2 - The oxidation of an equimolar FeCoNiAl medium-entropy alloy was studied at 900 °C in various O2-containing atmospheres over the oxygen pressure range of 10–105 Pa. The alloy oxidized parabolically, having its oxidation rates steadily increasing with oxygen pressure. Duplex scales formed on the oxidized substrate, consisting of an outer CoFe2O4 layer and an inner α-Al2O3 layer. The position of the Pt-marker was located at the outer- and inner-layer boundary, demonstrating that the outward cation diffusion controlled the formation of CoFe2O4, while the growth of Al2O3 was contributed by the inward oxygen diffusion. © 2023 Elsevier Ltd.

AB - The oxidation of an equimolar FeCoNiAl medium-entropy alloy was studied at 900 °C in various O2-containing atmospheres over the oxygen pressure range of 10–105 Pa. The alloy oxidized parabolically, having its oxidation rates steadily increasing with oxygen pressure. Duplex scales formed on the oxidized substrate, consisting of an outer CoFe2O4 layer and an inner α-Al2O3 layer. The position of the Pt-marker was located at the outer- and inner-layer boundary, demonstrating that the outward cation diffusion controlled the formation of CoFe2O4, while the growth of Al2O3 was contributed by the inward oxygen diffusion. © 2023 Elsevier Ltd.

KW - A. medium-entropy alloy

KW - B. SEM

KW - B. TEM

KW - C. oxides

UR - https://www.scopus.com/pages/publications/85172282410

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85172282410&origin=recordpage

U2 - 10.1016/j.corsci.2023.111560

DO - 10.1016/j.corsci.2023.111560

M3 - RGC 21 - Publication in refereed journal

SN - 0010-938X

VL - 224

JO - Corrosion Science

JF - Corrosion Science

M1 - 111560

ER -

The oxidation of an equimolar FeCoNiAl medium-entropy alloy at 900 °C in various oxygen pressures

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