Abstract
Recent studies have shown that equiatomic CoCrFeMnNi high-entropy alloy (HEA) has excellent mechanical properties and irradiation resistance. However, upon neutron irradiation, He is always generated as a byproduct. In this study, the irradiation resistance of thin-film CoCrFeMnNi HEA samples irradiated by He ions at 773 K was compared with that of stainless steel 304 (SS304), which as the same crystal structure. Although the formation of He bubbles was observed during irradiation in both alloys, the He bubble density of the CoCrFeMnNi HEA was lower than that of SS304 under the same exposure conditions. The simulation of the effect of He on the formation of vacancy clusters in the CoCrFeMnNi HEA was carried out based on first-principles calculations. The results show that the He atom significantly improved the stability of the vacancy clusters in the CoCrFeMnNi HEA. Thus, even in the CoCrFeMnNi HEA, irradiation formed stable He-vacancy clusters that decreased the irradiation resistance compared with irradiation without He.
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