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Effects of Ta content on microstructure and oxidation behavior of AlCoCrFeNiYTax high entropy alloy

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The oxidation behavior of the AlCoCrFeNiY-Tax high entropy alloy(HEA)doped with different Ta contents at 1100 ℃ is investigated.In this study,different reasons for the spallation of the oxide scales of HEAs without/with excessive Ta addition after 1000 h of oxida-tion are discussed,and the most suitable Ta doping content for this HEA is explored,in which the HEA exhibits both an exceptionally low oxidation rate,and the formation of oxide scales composed of intact α-Al2O3.Meanwhile,it is found that the addition of Ta can effectively inhibit the phase transition of β phase,which makes the surface of the oxide scale smoother.By combining our experimental results with Wagner-Hauffe theory,the influence of Ta drag effect on oxide scale growth is explained,which provides some theoretical guidance for the subsequent design of AlCoCrFeNi HEAs,and can lead to the devel-opment of thermal barrier coatings at higher service temperature.

High-entropy alloyAl2O3 scalesOxidationElements diffusion

Cang Gu、Jun-Hao Hu、Jian-Bo Song、Cheng Xu、Ming-Yu Hu、Yu-Xuan Zhang、Jiang Tian、Chao Li、Jing Feng

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Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

Department of Physics,Hong Kong Baptist University,Hong Kong 999077,China

Yunan Major Scientific and Technological Projects grantNational Natural Science Foundation of ChinaYunnan Province Science Fund for Distinguished Young ScholarsRare and Precious Metals Material Genetic Engineering Project of Yunnan Province

202302AG050010919601032019FJ006202102AB080019-1

2024

10.1007/s12598-024-02706-9

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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