RT Journal Article
T1 Influence of Al addition on microstructure and electrochemical behaviour of CrMnFeCoNi high-entropy alloy
A1 Armendariz, Lorea
A1 Castrillejo, Lucia
A1 Vicario, Iban
A1 Gordo-Burgoa, Olaia
A1 Guraya, Teresa
AB To develop new corrosion-resistant materials for structural applications, CrMnFeCoNiAlx high-entropy alloys (HEAs) are produced via semi-industrial induction casting. The study aimed to investigate the influence of Al content (x = 0–0.3) on both microstructure evolution and corrosion properties of the alloys. X-ray diffraction and scanning electron microscopy (SEM) analysis revealed that all the alloys exhibited a single-phase face-centered cubic structure, with dendritic (Fe, Co, Cr-rich) and interdendritic (Mn, Ni, Al-rich) regions distinguished by elemental segregations. Furthermore, the incorporation of Al atoms into the solid solution led to an increase in the lattice parameter, indicating alloy strengthening. The corrosion resistance of the CrMnFeCoNiAlx alloy improved with higher Al addition. Electrochemical polarisation tests demonstrated a slight increase in the corrosion potential (Ecorr) and a significant decrease in the corrosion current density (icorr) upon Al addition. Additionally, slower kinetics for pit nucleation (higher E'corr) were observed, particularly notable for x = 0.3. Analysis of the corroded surfaces revealed a mixed degradation mechanism, involving pitting corrosion and selective dissolution of the interdendritic zone, which decreased as the Al content of the HEA increased. These findings underscore the effectiveness of Al addition in not only enhancing the mechanical properties of the Cantor alloy through solid solution strengthening, but also improving its corrosion resistance.
SN 0254-0584
YR 2024
FD 2024-05-01
LK https://hdl.handle.net/11556/4910
UL https://hdl.handle.net/11556/4910
LA eng
NO Armendariz , L , Castrillejo , L , Vicario , I , Gordo-Burgoa , O & Guraya , T 2024 , ' Influence of Al addition on microstructure and electrochemical behaviour of CrMnFeCoNi high-entropy alloy ' , Materials Chemistry and Physics , vol. 318 , 129316 . https://doi.org/10.1016/j.matchemphys.2024.129316
NO Publisher Copyright: © 2024 The Authors
DS TECNALIA Publications
RD 6 sept 2024