Abstract
High entropy alloys (HEAs) have great potential used for accident-tolerant fuel (ATF) due to their excellent properties. The ATF properties of AlCrCuFeMo x HEAs were systematically investigated. The AlCrCuFeMo x had the typical dendrite morphology and Cu and Al elements segregated in the interdendrite region. After 1200°C water vapour oxidation, compact and continuous α-Al2O3 oxide film formed on the surface and effectively protected the inner from further oxidation. When x = 1, the HEA had the best oxidation resistance (59 mg/dm2 weight gain after 1 h), two orders lower than that of the traditional Zr-1Nb alloy for nuclear fuel cladding. Under normal operation water condition, the performance of the present HEAs is not as good as Zr-1Nb due to the segregation of Cu and dispersed Al2O3 formed on the surface.
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