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.

Timothy Alexander Listyawan;Maya Putri Agustianingrum;Young Sang Na;Ka Ram Lim;Nokeun Park

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

材料科学技术（英文版）

[1]Timothy Alexander Listyawan;Maya Putri Agustianingrum;Young Sang Na;Ka Ram Lim;Nokeun Park-.Improving high-temperature oxidation behavior by modifying Al and Co content in Al-Co-Cr-Fe-Ni high-entropy alloy)[J].材料科学技术（英文版）,2022(34):115-126

Equi,AlCrFeNi

Improving,high,oxidation,behavior,by,modifying,content,entropy,Composition,modification,was,introduced,improve,resistance,varying,excluding,from,system,Since,adjusting,composition,shifted,valence,electron,concen,tration,VEC,alloys,dual,structure,expected,more,stable,At,low,temperatures,formed,mixed,oxide,products,increased,only,Cr2O3,Al2O3,dominated,surface,Compared,equiatomic,AlCoCrFeNi,four,component,had,better,due,monocrystalline,formation,Besides,role,maintaining,BCC,B2,phases,within,also,beneficial,supporting

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