Investigation of Corrosion Behavior in AlCoCrFeNix Alloys Produced by Spark Plasma Sintering

Yılmaz Güler F. B., Atapek Ş. H., Erbay Y. E., Güler İ.

Second International Conference on Bioactive, Organic and Inorganic Advanced Materials and Clean Technologies, Sofija, Bulgaria, 27 - 29 April 2026, pp.93, (Summary Text)

  • Publication Type: Conference Paper / Summary Text
  • City: Sofija
  • Country: Bulgaria
  • Page Numbers: pp.93
  • Kocaeli University Affiliated: Yes

Abstract

High-entropy alloys have become a widely studied category of advanced materials due to the increased mixing entropy and phase stability provided by multi-component alloy design [1]. The controllability of their microstructural components allows precise regulation of mechanical, thermal, and electrochemical properties [2]; such a capability inevitably makes the chemical composition and phase constitution decisive factors in designing many material-specific structural properties. [3]. In this study, equimolar AlCoCrFeNi and AlCoCrFeNi1.5 alloys were produced by spark plasma sintering (SPS) and systematically examined in terms of microstructure and corrosion performance. As shown in Figure 1, XRD patterns confirmed the presence of BCC + FCC solid solution structures, while SEM/EDS analyses revealed distinct microstructural differences, with AlCoCrFeNi1.5 exhibiting a higher fraction of the FCC phase. Electrochemical tests in 3.5 wt.% NaCl demonstrated that AlCoCrFeNi1.5 possesses superior corrosion resistance, attributed to a more stable, chromium-enriched passive film. These results clearly establish the structure–property relationship and highlight the corrosion advantages of FCC-rich AlCoCrFeNi1.5 alloys produced by SPS.