On the microstructure, corrosion behavior and surface films of the multi-principal element alloy CrNiTiV

A multi-principal element alloy consisting of equi-atomic concentrations of Cr, Ni, Ti, and V, was produced by arc melting. The CrNiTiV alloy was characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and scanning transmission electron spectroscopy...

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Published inElectrochimica acta Vol. 505; p. 144959
Main Authors O'Brien, S.P., Darwish, A.A., DelVecchio, E., Mehta, R.M., Birbilis, N., Gupta, R.K.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 20.11.2024
Subjects
Corrosion
High-entropy alloy (HEA)
Multi-principal element alloy (MPEA)
Passivity
Surface film
High-entropy alloy (HEA)
Surface film
Corrosion
Multi-principal element alloy (MPEA)
Passivity
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Summary:A multi-principal element alloy consisting of equi-atomic concentrations of Cr, Ni, Ti, and V, was produced by arc melting. The CrNiTiV alloy was characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and scanning transmission electron spectroscopy (STEM), revealing a complex microstructure containing five phases. The corrosion performance of the alloy was evaluated with cyclic potentiodynamic polarization tests, indicating a low corrosion current density, a high breakdown potential and high repassivation potential. X-ray photoelectron spectroscopy and STEM were carried out after constant immersion in 0.6 M NaCl solution, revealing the passive (surface) film for each of the five phases. The Cr and V dominant phase consisted of an oxidized Cr/V-rich surface film, while the remaining four Ti-containing phases were predominantly TiO2-rich surface films. Ni enrichment and Ti deficiency were observed at the metal/oxide interface in certain Ti-containing phases.
ISSN:0013-4686
DOI:10.1016/j.electacta.2024.144959