Improving high-temperature oxidation behavior by modifying Al and Co content in Al-Co-Cr-Fe-Ni high-entropy alloy

Timothy Alexander Listyawan ¹Maya Putri Agustianingrum ¹Young Sang Na ²Ka Ram Lim ²Nokeun Park³

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作者信息

1. School of Materials Science and Engineering,Yeungnam University,280 Daehak-ro,Gyeongbuk 38541,Republic of Korea
2. Advanced Metals Division,Korea Institute of Materials Science(KIMS),797 Changwondaero,Seongsan-gu,Changwon,Gyeongnam 51508,Republic of Korea
3. School of Materials Science and Engineering,Yeungnam University,280 Daehak-ro,Gyeongbuk 38541,Republic of Korea;Institute of Materials Technology,Yeungnam University,280 Daehak-ro,Gyeongsan,Gyeongbuk 38541,Republic of Korea
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Abstract

Composition modification was introduced to improve the oxidation resistance by varying Al and excluding Co from the Al-Co-Cr-Fe-Ni system.Since adjusting the composition shifted the valence electron concen-tration(VEC)of the alloys,the dual-phase structure of the alloys is expected to be more stable.At low temperatures(T＜1273 K),the alloys formed mixed oxide products.As oxidation temperature increased,only Cr2O3 or Al2O3 dominated the alloy's surface.Compared to equiatomic AlCoCrFeNi(5-Equi),non-equiatomic AlCoCrFeNi(5-B 40)and four-component AlCrFeNi(4-B 2013)had better oxidation resistance due to monocrystalline-Al2O3 formation.Besides the role of oxide formation,maintaining BCC and B2 phases within the alloys is also beneficial to supporting the stable Cr2O3 or Al2O3.

Key words

High-entropy alloy/Alloy design/Oxidation/Valence electron concentration/Phase stability/Transmission electron microscope

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基金项目

Ministry of Science,ICT and Future Planning(Republic of Korea)through the"Future Material Discovery Project of the National Rese(NRF-2016M3D1A1023534)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量63

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