TY - JOUR
T1 - Elemental effects on the oxidation of refractory compositionally complex alloys
AU - Lo, Kai Chi
AU - Murakami, Hideyuki
AU - Glatzel, Uwe
AU - Yeh, Jien Wei
AU - Gorsse, Stéphane
AU - Yeh, An Chou
N1 - Funding Information:
This work was financially supported by the “ High Entropy Materials Centre ” from The Featured Areas Research Centre Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and from the Project MOST107-2923-E-007-010-MY3 , MOST109-2221-E-007-057 , MOST110-2634-F-007-024 , MOST110-2224-E-007-001 , MOST110-2221-E-007-020-MY3 by Ministry of Science and Technology (MOST) in Taiwan. UG gratefully acknowledge the support by the Deutsche Forschungsgemeinschaft through the Priority Programme SPP 2006 “Compositionally Complex Alloys - High Entropy Alloys (CCA - HEA)”. SG gratefully acknowledge the support by the CNRS through the 80 PRIME programme.
Publisher Copyright:
© 2022
PY - 2022/11
Y1 - 2022/11
N2 - The oxidation of refractory compositionally complex alloys (RCCAs) is one of the most critical subjects for their high temperature applications. In this work, several RCCAs were systematically designed and isothermally oxidised at 1000 °C for up to 24 h; the elemental effects of Al, Cr, Mo, Nb Ta, Ti, V, and Zr on the oxidation of the RCCAs were studied. It was found that Al, Cr, Ti could enhance the oxidation resistance of the RCCAs by promoting the formation of rutile-type AlTaO4, CrTaO4, and their related oxides, while Zr and V formed non-protective oxides such as Nb2Zr6O17, Ta2Zr6O17, ZrTiO4, and VTa9O25, resulting in severe internal oxidation. Mo appeared to be effective in suppressing internal oxidation, but it could form non-protective MoTiTa8O25. Ta was slightly more beneficial than Nb for reducing the oxidation mass gain. This study provides insights on the elemental effects on the oxidation and guidelines for improving the oxidation resistance of RCCAs.
AB - The oxidation of refractory compositionally complex alloys (RCCAs) is one of the most critical subjects for their high temperature applications. In this work, several RCCAs were systematically designed and isothermally oxidised at 1000 °C for up to 24 h; the elemental effects of Al, Cr, Mo, Nb Ta, Ti, V, and Zr on the oxidation of the RCCAs were studied. It was found that Al, Cr, Ti could enhance the oxidation resistance of the RCCAs by promoting the formation of rutile-type AlTaO4, CrTaO4, and their related oxides, while Zr and V formed non-protective oxides such as Nb2Zr6O17, Ta2Zr6O17, ZrTiO4, and VTa9O25, resulting in severe internal oxidation. Mo appeared to be effective in suppressing internal oxidation, but it could form non-protective MoTiTa8O25. Ta was slightly more beneficial than Nb for reducing the oxidation mass gain. This study provides insights on the elemental effects on the oxidation and guidelines for improving the oxidation resistance of RCCAs.
KW - Compositionally complex alloys
KW - Oxidation
KW - Refractory alloys
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U2 - 10.1016/j.ijrmhm.2022.105918
DO - 10.1016/j.ijrmhm.2022.105918
M3 - Article
AN - SCOPUS:85132518901
SN - 0263-4368
VL - 108
JO - International Journal of Refractory Metals and Hard Materials
JF - International Journal of Refractory Metals and Hard Materials
M1 - 105918
ER -