Tuning the microstructure for superb corrosion resistance in eutectic high entropy alloy

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)197-208
Journal / PublicationJournal of Materials Science and Technology
Online published7 Nov 2021
Publication statusPublished - 20 May 2022


In this work, we demonstrate that the corrosion resistance of the FeCrNiCoNb0.5 eutectic high entropy alloy (EHEA) can be tuned by controlling the size of its eutectic structure. Through microstructure refinement, the EHEA exhibits a superb corrosion resistance in 1  M NaCl in terms of a very low corrosion current density and an ultra-high transpassviation potential, which outperforms a variety of other HEAs and conventional metals and alloys. At the fundamental level, the microstructure refinement results in a rapid formation of a thick and compact passive film with less Cl adsorption on the EHEA, which results in significant enhancement in its corrosion resistance. The outcome of our research provides important insights into the design of corrosion resistant chemically complex alloys.

Research Area(s)

  • Eutectic high entropy alloy, Microstructure size, Passivation, Transpassivation potential