Unveiling the Oxidation Mechanisms of High‐entropy Carbides Through Atomic‐scale Dynamic Observation

(Me = metallic elements, Ta, Ti, Cr, and Nb) high-entropy oxides above 800 °C, accompanied with the reduction in atomic defects. This result is further confirmed by theoretical calculations that these observed high-entropy oxide phases are thermodynamically preferable to generate above 830 °C. The study provides direct evidence of the ordered-disordered-ordered structural transition of HECs during oxidation.