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A combinatorial approach for the synthesis and analysis of AlxCryMozNbTiZr high-entropy alloys: Oxidation behavior

Published online by Cambridge University Press:  26 July 2018

Owais Ahmed Waseem ,
Ulanbek Auyeskhan ,
Hyuck Mo Lee  and
Ho Jin Ryu Open the ORCID record for Ho Jin Ryu [Opens in a new window]
Owais Ahmed Waseem*
Affiliation:
Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
Ulanbek Auyeskhan*
Affiliation:
Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
Hyuck Mo Lee
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
Ho Jin Ryu*
Affiliation:
Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
*
a)Address all correspondence to this author. e-mail: hojinryu@kaist.ac.kr
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Abstract

To overcome the limited feasibility of various refractory high-entropy alloys (HEAs) due to the presence of (i) very dense elements (W and Ta), (ii) costly elements (Hf and Ta), and (iii) oxidation prone elements (V) in them, AlxCryMozNbTiZr HEAs were prepared via arc-melting. Considering the critical nature of oxidation resistance in high-temperature applications, HEAs were characterized to form a combinatorial library of microstructural and oxidation behavior. AlxCryMozNbTiZr HEAs revealed multiphase microstructures consisting of intermetallic phases along with BCC matrices. Mass loss and porous microstructures were obtained in Mo-rich HEAs after oxidation at 1000 °C for 1 h. The presence of Al enhanced the oxidation resistance and developed a protective oxide layer on the HEAs. Al30Cr10-NTZ exhibited promising potential for use in high temperature applications, as it showed an oxidation time exponent of ∼0.5 and a dense and continuous oxide layer.

Keywords

microstructurealloyoxidation
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3226 - 3234
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

b)

These authors contributed equally to this work.

References

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