Fabrication, microstructure, mechanical, and electrochemical properties of NiMnFeCu high entropy alloy from elemental powders

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dc.contributor.authorKumar, Ashoken_NZ
dc.contributor.authorMucalo, Michael R.en_NZ
dc.contributor.authorBolzoni, Leandroen_NZ
dc.contributor.authorLi, Yimingen_NZ
dc.contributor.authorKong, Fantaoen_NZ
dc.contributor.authorYang, Feien_NZ
dc.date.accessioned2022-01-17T22:05:52Z
dc.date.available2022-01-17T22:05:52Z
dc.date.issued2022en_NZ
dc.description.abstractTransition metal based high entropy alloys (HEAs) are often used in electrocatalytic (water electrolysis) applications due to the synergistic effect operating among its constituent elements and unpaired electrons in d orbitals of the concerned metal. In this study, a low cost NiMnFeCu high entropy alloy was successfully synthesised using the combined techniques of mechanical milling (MA) and vacuum sintering. X‐ray diffraction was used to analyse the phase composition, optical microscopy, and scanning electron microscopy were used to characterise the fabricated material’s microstructure and chemical homogeneity, thermal, and mechanical properties were tested using the differential scanning calorimetry method and a universal testing machine, respectively. Electrochemical workstation was used to carry out preliminary electrochemical studies such as linear sweep voltammetry (LSV), cyclic voltammetry (CV) and chronoamperometry. The results showed that the as‐ sintered NiMnFeCu HEA possessed a single‐ phase FCC structure. The HEA NiMnFeCu sintered at 1050 °C (S4) and 1000 °C (S2) with a holding time of 2 h showed a yield strength of 516.3 MPa and 389.8 MPa, respectively, and the micro‐hardness values were measured to be 233.45 ± 9 HV and 198.7 ± 8 HV, respectively. Preliminary electrochemical studies proved that the alloy sintered at 1000 °C (S2) with a holding time of 2 h exhibited excellent electrocatalytic properties with a measured overpotential of 322 mV at 10 mA cm⁻² at 100 cycles of CV and good stability for 10 h when compared to state‐of‐the‐art electrocatalytic materials IrO₂ and RuO₂ This suggested that the HEA NiMnFeCu fabricated under the condition S2 could potentially be used for industrial‐scale water electrolysis as it possesses permissible mechanical and good electrochemical properties.en_NZ
dc.format.mimetypeapplication/pdf
dc.identifier.doi10.3390/met12010167en_NZ
dc.identifier.issn2075-4701en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/14718
dc.language.isoen
dc.publisherMDPI AGen_NZ
dc.relation.isPartOfMetalsen_NZ
dc.rights© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
dc.subjecthigh entropy alloysen_NZ
dc.subjectpowder metallurgy
dc.subjectvacuum sintering
dc.subjectmicrostructure
dc.subjectoxygen evolution reaction
dc.titleFabrication, microstructure, mechanical, and electrochemical properties of NiMnFeCu high entropy alloy from elemental powdersen_NZ
dc.typeJournal Article
dspace.entity.typePublication
pubs.begin-page167
pubs.end-page167
pubs.issue2022en_NZ
pubs.volume12en_NZ
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