A Cobalt-Free Multi-Principal Elements Alloy with Balanced Mechanical Properties and Exceptional Corrosion Resistance
Jinhong Deng1, Manyu Hua1, Yangyang Zheng2
1College of Mechanical and Vehicle Engineering, Changsha University of Science and Technology, Changsha 410114, China.
Abstract:
This study investigates the mechanical properties and corrosion behavior of a Co-free Fe40Ni30Cr20V8Mo2 (at.%) multi-principal elements alloy (MPEA) designed for potential applications in aggressive environments. The alloy exhibits a balanced combination of strength and ductility, with a yield strength of approximately 258 MPa, an ultimate tensile strength of about 647 MPa, and a fracture elongation of around 52%, of which deformation is primarily governed by dislocation-mediated plasticity. In terms of corrosion performance, the alloy demonstrates excellent resistance in chloride-containing environments. Potentiodynamic polarization tests reveal a wide and stable passive region of approximately 1.28 VSCE and a high pitting potential of about 0.975 VSCE, indicating exceptional stability of the passive film. Electrochemical impedance spectroscopy (EIS) further confirms the high impedance and protective nature of the surface layer. X-ray photoelectron spectroscopy (XPS) analysis reveals that the superior anti-corrosion property is attributed to the formation of a passive film enriched with protective Cr2O3 and V, Mo oxides, which collectively construct an effective barrier against chloride-induced attack by reducing donor density. This work provides valuable insights for the development of alternative alloys to replace Co-containing systems in demanding corrosive applications.
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