Effect of oxygen pressure on the oxidation behavior of NiCoCr medium-entropy alloy at 800 °C

W. Kai; H. C. Lin; F. P. Cheng; H. H. Hsieh; W. T. Lin; D. Chen; J. J. Kai

doi:10.1016/j.corsci.2021.109411

Effect of oxygen pressure on the oxidation behavior of NiCoCr medium-entropy alloy at 800 °C

W. Kai^*, H. C. Lin, F. P. Cheng, H. H. Hsieh, W. T. Lin, D. Chen, 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

9 Citations (Scopus)

Abstract

The oxidation behavior of NiCoCr medium-entropy alloy was investigated at 800 °C in various oxygen pressures from 10 to 10⁵ Pa. The results showed that the oxidation kinetics of NiCoCr followed the parabolic rate law, regardless of oxygen pressure. The oxidation rate constants of the alloy steadily increased with increasing oxygen pressure. The oxidation mechanism of the MEA was mainly controlled by outward cation diffusion to form an exclusive Cr₂O₃ layer although minor amounts of Co- or Ni-Cr spinels were observed at PO₂ = 10⁵ Pa under TEM analyses. The main diffusing species were doubly- and triply-ionized cation vacancies.

Original language	English
Article number	109411
Journal	Corrosion Science
Volume	185
Online published	19 Mar 2021
DOIs	https://doi.org/10.1016/j.corsci.2021.109411
Publication status	Published - Jun 2021

Research Keywords

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

Access Output

10.1016/j.corsci.2021.109411

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@article{ef240a7cfcbf45bc85484a0a6ebd41c6,

title = "Effect of oxygen pressure on the oxidation behavior of NiCoCr medium-entropy alloy at 800 °C",

abstract = "The oxidation behavior of NiCoCr medium-entropy alloy was investigated at 800 °C in various oxygen pressures from 10 to 105 Pa. The results showed that the oxidation kinetics of NiCoCr followed the parabolic rate law, regardless of oxygen pressure. The oxidation rate constants of the alloy steadily increased with increasing oxygen pressure. The oxidation mechanism of the MEA was mainly controlled by outward cation diffusion to form an exclusive Cr2O3 layer although minor amounts of Co- or Ni-Cr spinels were observed at PO2 = 105 Pa under TEM analyses. The main diffusing species were doubly- and triply-ionized cation vacancies.",

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

author = "W. Kai and Lin, {H. C.} and Cheng, {F. P.} and Hsieh, {H. H.} and Lin, {W. T.} and D. Chen and Kai, {J. J.}",

year = "2021",

month = jun,

doi = "10.1016/j.corsci.2021.109411",

language = "English",

volume = "185",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Effect of oxygen pressure on the oxidation behavior of NiCoCr medium-entropy alloy at 800 °C

AU - Kai, W.

AU - Lin, H. C.

AU - Cheng, F. P.

AU - Hsieh, H. H.

AU - Lin, W. T.

AU - Chen, D.

AU - Kai, J. J.

PY - 2021/6

Y1 - 2021/6

N2 - The oxidation behavior of NiCoCr medium-entropy alloy was investigated at 800 °C in various oxygen pressures from 10 to 105 Pa. The results showed that the oxidation kinetics of NiCoCr followed the parabolic rate law, regardless of oxygen pressure. The oxidation rate constants of the alloy steadily increased with increasing oxygen pressure. The oxidation mechanism of the MEA was mainly controlled by outward cation diffusion to form an exclusive Cr2O3 layer although minor amounts of Co- or Ni-Cr spinels were observed at PO2 = 105 Pa under TEM analyses. The main diffusing species were doubly- and triply-ionized cation vacancies.

AB - The oxidation behavior of NiCoCr medium-entropy alloy was investigated at 800 °C in various oxygen pressures from 10 to 105 Pa. The results showed that the oxidation kinetics of NiCoCr followed the parabolic rate law, regardless of oxygen pressure. The oxidation rate constants of the alloy steadily increased with increasing oxygen pressure. The oxidation mechanism of the MEA was mainly controlled by outward cation diffusion to form an exclusive Cr2O3 layer although minor amounts of Co- or Ni-Cr spinels were observed at PO2 = 105 Pa under TEM analyses. The main diffusing species were doubly- and triply-ionized cation vacancies.

KW - A. Medium-entropy alloy

KW - B. SEM

KW - C. Scales

KW - TEM

UR - http://www.scopus.com/inward/record.url?scp=85103118652&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85103118652&origin=recordpage

U2 - 10.1016/j.corsci.2021.109411

DO - 10.1016/j.corsci.2021.109411

M3 - RGC 21 - Publication in refereed journal

SN - 0010-938X

VL - 185

JO - Corrosion Science

JF - Corrosion Science

M1 - 109411

ER -

Effect of oxygen pressure on the oxidation behavior of NiCoCr medium-entropy alloy at 800 °C

Abstract

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Cite this