Abstract
The oxidation behavior of the FeCoNiAlCrB and FeCoNiAlCrBY0.1 alloys was compared by investigating the effects of Y0.1 addition on the growth rate, microstructure, and chemical composition of the oxide layer. The results showed that the oxidation rate constant of FeCoNiAlCrB HEA at 1000 °C decreased significantly by 2-orders of magnitude from 0.94 × 102 μm2/h to 2.11 × 10−1 μm2/h due to the doping of Y0.1. The high oxidation rate of FeCoCrAlNiB alloy was mainly attributed to the dissolution of the protective network borides, and the greatly improved oxidation resistance of the Y0.1-doped alloy could result from the continuously progressive formation of protective dense α-Al2O3 layer.
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