Abstract
Present study deals with the oxidation properties of the harmonic structured high-entropy Cantor (CoCrFeMnNi) alloy at 600 °C, 700 °C, and 800 °C in zero-grade air. The microstructure of the Cantor alloy is modified to a harmonic distribution with grain sizes at shell of ∼2 μm and core of ∼20 μm. The oxidation behavior of the harmonic one is compared with its non-harmonic counterpart and as-received 304L stainless steel. Both the high-entropy Cantor alloys show inferior oxidation resistance than the 304L stainless steel in this temperature range. Studies show that an Mn-rich oxide scale forms on the surface of the Cantor alloys, whereas a Cr-rich oxide scale forms on the 304L stainless steel surface. The high Mn content in the Cantor alloys deteriorates their oxidation resistance. However, the harmonic structure improves the oxidation resistance in the Cantor alloy due to the preferential oxidation of the shell region and the formation of a more compact oxide scale than its non-harmonic counterpart.
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