Details

Autor(en) / Beteiligte

• Bazioti, C.
• Løvvik, O.M.
• Poulia, A.
• Carvalho, P.A.
• Azar, A.S.
• Mikheenko, P.
• Diplas, S.
• Gunnæs, A.E.

Titel

Probing the structural evolution and its impact on magnetic properties of FeCoNi(AlMn)x high-entropy alloy at the nanoscale

Ist Teil von

• Journal of alloys and compounds, 2022-07, Vol.910, p.164724, Article 164724

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We 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. •First nanoscale investigation of FeCoNi(AlMn)x HEAs processed by LMD, combining advanced (S)TEM and DFT calculations.•Ordering phenomena - nanoscale interplay between B2 and L21, ordered superstructures - and impact on magnetic properties.•Atomic site occupancy resolved by direct imaging and atomic-scale calculations.•Phase separation in FCC opens up avenues for tuning alloy properties through chemically-designed decomposition regimes.•All alloy compositions exhibited soft-magnetic behavior with coercivity values< 1000 A/m.