Abstract
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.
基金项目
Yunan Major Scientific and Technological Projects grant(202302AG050010)
National Natural Science Foundation of China(91960103)
Yunnan Province Science Fund for Distinguished Young Scholars(2019FJ006)
Rare and Precious Metals Material Genetic Engineering Project of Yunnan Province(202102AB080019-1)
NETL
NSTL
万方数据