Print Email Facebook Twitter Effects of Cr/Ni ratio on physical properties of Cr-Mn-Fe-Co-Ni high-entropy alloys Title Effects of Cr/Ni ratio on physical properties of Cr-Mn-Fe-Co-Ni high-entropy alloys Author Wagner, Christian (Ruhr-Universität Bochum) Ferrari, A. (TU Delft Team Marcel Sluiter) Schreuer, Jürgen (Ruhr-Universität Bochum) Couzinié, Jean Philippe (Université Paris-Est Créteil) Ikeda, Yuji (University of Stuttgart; Max-Planck-Institut für Eisenforschung) Körmann, F.H.W. (TU Delft Team Marcel Sluiter; Max-Planck-Institut für Eisenforschung) Eggeler, Gunther (Ruhr-Universität Bochum) George, Easo P. (Oak Ridge National Laboratory; The University of Tennessee Knoxville) Laplanche, Guillaume (Ruhr-Universität Bochum) Date 2022 Abstract Physical properties of ten single-phase FCC CrxMn20Fe20Co20Ni40-x high-entropy alloys (HEAs) were investigated for 0 ≤ x ≤ 26 at%. The lattice parameters of these alloys were nearly independent of composition while solidus temperatures increased linearly by ∼30 K as x increased from 0 to 26 at.%. For x ≥ 10 at.%, the alloys are not ferromagnetic between 100 and 673 K and the temperature dependencies of their coefficients of thermal expansion and elastic moduli are independent of composition. Magnetic transitions and associated magnetostriction were detected below ∼200 K and ∼440 K in Cr5Mn20Fe20Co20Ni35 and Mn20Fe20Co20Ni40, respectively. These composition and temperature dependencies could be qualitatively reproduced by ab initio simulations that took into account a ferrimagnetic ↔ paramagnetic transition. Transmission electron microscopy revealed that plastic deformation occurs initially by the glide of perfect dislocations dissociated into Shockley partials on {111} planes. From their separations, the stacking fault energy (SFE) was determined, which decreases linearly from 69 to 23 mJ·m−2 as x increases from 14 to 26 at.%. Ab initio simulations were performed to calculate stable and unstable SFEs and estimate the partial separation distances using the Peierls-Nabarro model. While the compositional trends were reasonably well reproduced, the calculated intrinsic SFEs were systematically lower than the experimental ones. Our ab initio simulations show that, individually, atomic relaxations, finite temperatures, and magnetism strongly increase the intrinsic SFE. If these factors can be simultaneously included in future computations, calculated SFEs will likely better match experimentally determined SFEs. Subject CoCrFeMnNiCoefficient of thermal expansionCurie temperatureElastic constantsGeneralized stacking fault energyStacking fault energy To reference this document use: http://resolver.tudelft.nl/uuid:b94a2546-2066-4a43-b5b5-a751552839b9 DOI https://doi.org/10.1016/j.actamat.2022.117693 ISSN 1359-6454 Source Acta Materialia, 227 Part of collection Institutional Repository Document type journal article Rights © 2022 Christian Wagner, A. Ferrari, Jürgen Schreuer, Jean Philippe Couzinié, Yuji Ikeda, F.H.W. Körmann, Gunther Eggeler, Easo P. George, Guillaume Laplanche Files PDF 1_s2.0_S1359645422000805_main.pdf 4.79 MB Close viewer /islandora/object/uuid:b94a2546-2066-4a43-b5b5-a751552839b9/datastream/OBJ/view