Alloys, Volume 5, Issue 2
2026 June - 5 articles
Cover Story: The CoCrFeNi medium-entropy alloy (MEA) transitions from a single-phase face-centered cubic (FCC) structure to a duplex FCC + body-centered cubic (BCC) microstructure upon the addition of 15 and 20 at.% Gallium (Ga). This compositional shift increases the Ga-rich BCC phase fraction from 18–22% to 31–34%, altering the matrix uniformity. Electrochemical testing (EFM, CPP, EIS) reveals that Ga inclusion degrades overall corrosion resistance. Charge transfer resistance (Rct) decreases from 22,620 Ω (Ga0) to 10,060 Ω (Ga20), while corrosion current density (Icorr) increases. Although Ga induces rapid initial passivation and grain refinement, the accompanying reduction in Chromium (Cr) content and the presence of phase boundaries ultimately accelerate long-term dissolution and pitting susceptibility. View this paper
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Alloys - ISSN 2674-063X