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dc.contributor.authorBazioti, Kalliopi
dc.contributor.authorLøvvik, Ole Martin
dc.contributor.authorPoulia, Anthoula
dc.contributor.authorAlmeida Carvalho, Patricia
dc.contributor.authorS. Azar, Amin
dc.contributor.authorMikheenko, Pavlo
dc.contributor.authorDiplas, Spyridon
dc.contributor.authorGunnæs, Anette Eleonora
dc.identifier.citationJournal of Alloys and Compounds. 2022, 910 1-12.en_US
dc.description.abstractWe report the first nanoscale investigation of FeCoNi(AlMn)x high-entropy alloys (HEAs) processed by laser metal deposition. The structural evolution of the alloy upon chemical composition variation (0.2 ≤ x ≤ 1.5) was investigated by combining imaging and spectroscopies in (scanning) transmission electron microscopy (S)TEM with density functional theory (DFT). A gradual change from a face-centered cubic (FCC) towards an ordered full-Heusler (L21) phase by increasing the Al and Mn contents was observed. Direct imaging and atomic-scale calculations revealed a nanoscale interplay between B2 and L21 ordered structures for x = 1.5, wherein the latter, Al and Mn occupy two different Wyckoff sites. By decreasing x, the FCC phase dominates exhibiting intense phase separation tendency, ordering phenomena, and nano-precipitation. Although not chemically discriminated, plasmon-peak splitting in low-loss electron energy loss spectra revealed the presence of two valence electron densities within the FCC phase. Lorentz TEM showed that the ordered nano-precipitates and nano-sized grains with a structure based on a tripled FCC unit cell are pinning-sites for magnetic domain walls and dislocations. All alloy compositions exhibited soft-magnetic behavior with coercivity (Hc) values< 1000 A/m. The FeCoNi(AlMn)1.5 alloy with L21/B2 nanostructure showed the highest magnetization (Ms) with relatively low Hc, attributed to the large magnetic moment of Mn and the synergistic effect of Mn-Al according to DFT, whilst ordering does not impose a negative effect. Phase separation trends within the FCC phase seem to decrease the Ms however, the overall impact on the magnetic behavior is not intense, opening up for new avenues for tuning FeCoNiAlMn properties through chemically-designed phase decomposition regimes.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectPreferential site orderingen_US
dc.subjectPhase separationen_US
dc.subjectMagnetic propertiesen_US
dc.subjectDFT calculationsen_US
dc.subjectTransmission electron microscopyen_US
dc.subjectHigh-entropy alloysen_US
dc.titleProbing the structural evolution and its impact on magnetic properties of FeCoNi(AlMn)x high-entropy alloy at the nanoscaleen_US
dc.title.alternativeProbing the structural evolution and its impact on magnetic properties of FeCoNi(AlMn)x high-entropy alloy at the nanoscaleen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2022 The Author(s). Published by Elsevier B.Ven_US
dc.source.journalJournal of Alloys and Compoundsen_US
dc.relation.projectNorges forskningsråd: nn2615ken_US
dc.relation.projectNorges forskningsråd: 197405en_US
dc.relation.projectNorges forskningsråd: 287979en_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal