Tuning the near room temperature oxidation behavior of high-entropy alloy nanoparticles

Abstract

Understanding the oxidation behavior of high-entropy alloys (HEAs) is essential to their practical applications. Here we conducted in situ environmental transmission electron microscopy (E-TEM) observations of dynamic oxidation processes in CrMnFeCoNi and CrFeCoNiPd nanoparticles (NPs) near room temperature. During the oxidation of CrMnFeCoNi NPs, a favorable oxidation product was MnCr 2 O 4 with the spinel structure. The surface nanoislands of MnCr 2 O 4 underwent dynamic reconstruction, resulting in the thickened oxide layer with less crystallinity. In CrFeCoNiPd NPs, the reactive element Mn was replaced by the inert element Pd. As a result, a favorable oxide product was CrO 2 with the rutile structure. CrO 2 formed on the NP surface and was a result of Cr outward diffusion through the oxide layer. In addition, FeO nanocrystals formed at the oxide/metal interface and were a result of O inward diffusion through the oxide layer. We also performed first principles calculations to provide insights into the energetics and diffusion rates related to oxide formation. These results reveal the non-equilibrium processes of oxidation in HEA NPs that can be strongly influenced by small particle sizes and large surface areas. This work underscores the high tunability of oxidation behavior in nanoscale HEAs by changing their constituent alloying elements.

Minimizing the diffusivity difference between vacancies and interstitials in multi-principal element alloys

“…6 D . The Pd exhibits considerably larger mobility than the small atom, when migrating via vacancies, which is generally consistent with the previous work ( 33 ). It is perhaps unexpected that the large Pd atom facilitates vacancy migration, to the extent that the jump rate of Pd becomes manyfold faster than the base elements.…”