Oxidation Behavior of Pack-Cemented Refractory High-Entropy Alloy
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https://doi.org/10.1007/s11837-020-04439-3 Ó 2020 The Minerals, Metals & Materials Society
SURFACE ENGINEERING: APPLICATIONS FOR ADVANCED MANUFACTURING
Oxidation Behavior of Pack-Cemented Refractory High-Entropy Alloy WON JUNE CHOI,1 CHUN WOONG PARK,1 YONGWOOK SONG,2 HYUNJOO CHOI,2 JONGMIN BYUN ,3,5 and YOUNG DO KIM1,4,6 1.—Department of Materials Science and Engineering, Hanyang University, 222 Wangsimniro, Seongdong-gu, Seoul 04763, Republic of Korea. 2.—School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea. 3.—Department of Materials Science and Engineering, Seoul National University of Science and Technology, 232 Gongneungro, Nowon-gu, Seoul 01811, Republic of Korea. 4.—The Research Institute of Industrial Science, Hanyang University, Seoul 04763, Republic of Korea. 5.—e-mail: [email protected]. 6.—e-mail: [email protected]
In this study, Al pack cementation was conducted on a high-entropy alloy (HEA), and the oxidation behavior of the pack-cemented HEA was investigated. The alloy was fabricated via powder metallurgy (PM). Al pack cementation was performed at 500°C and 800°C for up to 5 h. The microstructure was analyzed after the pack cementation process, and the phase identification was conducted. The oxidation test was conducted at 1000°C for 3 h under air atmosphere, and the detailed microstructure was investigated using various analyses. The specimen that was pack-cemented at 800°C for 5 h exhibited improved oxidation resistance, whereas the specimen that was not subjected to pack cementation and the one that was pack-cemented at 500°C for 5 h demonstrated poor oxidation resistances. Microstructure and phase analyses were used to examine the diffusion of atoms and determine the oxidation behavior with regard to atomic diffusion.
INTRODUCTION High-entropy alloys (HEAs), which exhibit high entropies compared to other commercialized alloys, were first developed by Yeh et al.1 HEAs are composed of five atoms or more, which have similar atomic radii and structure. Owing to their high entropies, these alloys comprise a single-phase solid solution rather than intermetallic phases.2 HEAs are known to exhibit superior mechanical properties, such as ductility at low temperature, wear resistance, and resistance to corrosion. These properties arise from various phenomena, such as the high-entropy effect and the lattice-distortion effect.3–6 Owing to their peculiar behavior, extensive research has been conducted on HEAs.5,7–10 Industrial exploitation of HEAs is foreseen, for instance, in the aerospace industry, in which materials with excellent reliability and durability at high temperature are sought. HEAs can be classified into
(Received June 20, 2020; accepted October 5, 2020)
FCC (face-centered cubic)- and BCC (body-centered cubic)-based HEAs according to their crystal structure. These two types of HEAs exhibit different behaviors in terms of ductility and strength. Recently, refractory high-entropy alloys (RHEAs) based on refractory metals with high melting poi
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