High-temperature air-oxidation of NiCoCrAlx medium-entropy alloys

W. Kai; Z. Y. Jiang; G. T. Chen; I. H. Lee; H. J. Lin; H. H. Hsieh; W. T. Lin; J. J. Kai

doi:10.1016/j.corsci.2021.109858

High-temperature air-oxidation of NiCoCrAl_x medium-entropy alloys

W. Kai^*
, Z. Y. Jiang
, G. T. Chen
, I. H. Lee
, H. J. Lin
, H. H. Hsieh
, W. T. Lin
, J. J. Kai

^*Corresponding author for this work

Department of Mechanical Engineering

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

28 Citations (Scopus)

Abstract

The oxidation behaviour of four NiCoCrAl_x medium-entropy alloys (x = 0, 0.1, 0.3, or 0.5 mol.) was investigated in dry air at 600–900 °C. The oxidation kinetics of all the alloys followed the parabolic rate law at T> 700 °C, and the oxidation rates increased with an increase in temperature and a decrease in Al content. Discontinuous oxide granules were formed on all the alloys at 600 °C, while complex scales were detected, strongly depending on the Al content and temperature. Internal attack of AlN precipitates was also observed for Al-containing alloys at T> 700 °C.

Original language	English
Article number	109858
Journal	Corrosion Science
Volume	192
Online published	24 Sept 2021
DOIs	https://doi.org/10.1016/j.corsci.2021.109858
Publication status	Published - Nov 2021

Research Keywords

A. Medium-entropy alloy
B. SEM
C. Scales
TEM

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@article{6d5259e2bf234055898278acec2571fa,

title = "High-temperature air-oxidation of NiCoCrAlx medium-entropy alloys",

abstract = "The oxidation behaviour of four NiCoCrAlx medium-entropy alloys (x = 0, 0.1, 0.3, or 0.5 mol.) was investigated in dry air at 600–900 °C. The oxidation kinetics of all the alloys followed the parabolic rate law at T> 700 °C, and the oxidation rates increased with an increase in temperature and a decrease in Al content. Discontinuous oxide granules were formed on all the alloys at 600 °C, while complex scales were detected, strongly depending on the Al content and temperature. Internal attack of AlN precipitates was also observed for Al-containing alloys at T> 700 °C.",

keywords = "A. Medium-entropy alloy, B. SEM, C. Scales, TEM",

author = "W. Kai and Jiang, \{Z. Y.\} and Chen, \{G. T.\} and Lee, \{I. H.\} and Lin, \{H. J.\} and Hsieh, \{H. H.\} and Lin, \{W. T.\} and Kai, \{J. J.\}",

year = "2021",

month = nov,

doi = "10.1016/j.corsci.2021.109858",

language = "English",

volume = "192",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - High-temperature air-oxidation of NiCoCrAlx medium-entropy alloys

AU - Kai, W.

AU - Jiang, Z. Y.

AU - Chen, G. T.

AU - Lee, I. H.

AU - Lin, H. J.

AU - Hsieh, H. H.

AU - Lin, W. T.

AU - Kai, J. J.

PY - 2021/11

Y1 - 2021/11

N2 - The oxidation behaviour of four NiCoCrAlx medium-entropy alloys (x = 0, 0.1, 0.3, or 0.5 mol.) was investigated in dry air at 600–900 °C. The oxidation kinetics of all the alloys followed the parabolic rate law at T> 700 °C, and the oxidation rates increased with an increase in temperature and a decrease in Al content. Discontinuous oxide granules were formed on all the alloys at 600 °C, while complex scales were detected, strongly depending on the Al content and temperature. Internal attack of AlN precipitates was also observed for Al-containing alloys at T> 700 °C.

AB - The oxidation behaviour of four NiCoCrAlx medium-entropy alloys (x = 0, 0.1, 0.3, or 0.5 mol.) was investigated in dry air at 600–900 °C. The oxidation kinetics of all the alloys followed the parabolic rate law at T> 700 °C, and the oxidation rates increased with an increase in temperature and a decrease in Al content. Discontinuous oxide granules were formed on all the alloys at 600 °C, while complex scales were detected, strongly depending on the Al content and temperature. Internal attack of AlN precipitates was also observed for Al-containing alloys at T> 700 °C.

KW - A. Medium-entropy alloy

KW - B. SEM

KW - C. Scales

KW - TEM

UR - https://www.scopus.com/pages/publications/85115951283

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85115951283&origin=recordpage

U2 - 10.1016/j.corsci.2021.109858

DO - 10.1016/j.corsci.2021.109858

M3 - RGC 21 - Publication in refereed journal

SN - 0010-938X

VL - 192

JO - Corrosion Science

JF - Corrosion Science

M1 - 109858

ER -