High corrosion resistance duplex fcc + hcp cobalt based entropic alloys: An experimental and theoretical investigation
نویسندگان
چکیده
• A series of duplex fcc + hcp Co-based entropic alloys are discovered as a new category with outstanding mechanical properties. CALPHAD-based thermodynamic calculations were performed to facilitate alloy design and understand corrosion behaviors. The kinetics the electrochemical for designed in typical aggressive anion Cl - was investigated by tests. theoretical good agreement experimental observations, this provides solution an efficient designing resistance alloys. being properties, especially overcome trade-off between strength ductility. In work, (CALculation PHAse Diagram) tests, including open circuit potential (OCP), polarization cyclic curves, impedance spectroscopy (EIS). valence state surface morphologies passive films X-ray photoelectron (XPS) atomic force microscope (AFM). High materials high ductility performances present work. Except Ni-oxides, various spinel compounds many other oxides Co 2 O 3 , Cr Fe MnO, MoO CoCr 4 FeCr CoFe CoMoO observed films. adsorbed penetrated corrosive will be prone breakdown less form pitting (also include localized corrosion, such intergranular crevice corrosion). microstructure martensite matrix has played important role propagation anodic dissolution cleavage quasi-cleavage. observations. This paper paves way future development high-performance served some harsh environments.
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ژورنال
عنوان ژورنال: Materials & Design
سال: 2022
ISSN: ['1873-4197', '0264-1275']
DOI: https://doi.org/10.1016/j.matdes.2022.111166