article · Materials science forum
Face-centered cubic (FCC) medium-entropy alloys (MEAs) are known for their excellent ductility and fracture toughness, but they suffer from relatively low mechanical strength. Alloying elements are added in FCC MEA matrix to promote the formation of hard secondary phase or intermetallic compounds that improve the mechanical performance of the alloys. In this study, the effect of chromium (Cr) and niobium (Nb) additions on the microstructural and corrosion characteristics of the CoNiV MEA matrix was investigated. A scanning electron microscope coupled with energy dispersive spectroscopy was used to analyse the microstructure and composition of the developed alloys. The corrosion properties of the alloys were evaluated using linear polarization. The alloys exhibited a dendritic microstructure with the presence of secondary phases, which is consistent with slow cooling associated with arc melting and the presence of elements with large atomic radii that upset the crystal lattice. Alloy containing Cr possessed better anti-corrosive properties than its Nb counterpart, signalling formation of a more stable Cr 2 O 3 passive film. This layer creates a boundary between the corrosive medium and the alloy substrate to prevent further interaction.
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DOI: 10.4028/p-y5bkjq
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