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<p>Fe<sub>50</sub>Co<sub>40</sub>Ni<sub>10</sub> nanocrystalline powders were synthesized by mechanical alloying (MA) for various durations, in order to investigate the evolution of their structural, morphological, magnetic and thermal properties as a function of milling time. A comprehensive characterization of the synthesized powders was performed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) with Rietveld refinement, vibrating sample magnetometry (VSM) and differential scanning calorimetry (DSC). SEM analysis revealed significant morphological evolution, transitioning from coarse, irregular particles to near-spherical agglomerates with increasing milling time. XRD and EDS confirmed the formation of a solid solution within the body-centered cubic (bcc) Fe matrix. Rietveld refinements indicated a gradual decrease in lattice parameter from 0.2866 to 0.2855 nm, a crystallite size reduction to ~ 8 nm and an increase in lattice strain to ~ 0.6% after 48&#xa0;h of milling. Magnetic measurements demonstrated a peak coercivity (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({H}_{\text{C}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>H</mi> <mtext>C</mtext> </msub> </math></EquationSource> </InlineEquation>) of ~ 82 Oe and a saturation magnetization <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({(M}_{\text{S}})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mi>M</mi> </mrow> <mtext>S</mtext> </msub> <mrow> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> of ~ 160 A·m<sup>2</sup>/kg, highlighting the role of microstructural refinement in enhancing the soft magnetic behavior of the nanocrystalline alloy. DSC analysis identified exothermic peaks at 300&#xa0;°C and 450-500 °C, corresponding to residual stress relaxation, allotropic phase transformation, oxidation and atomic reordering, providing insights into the thermal stability of prepared nanocrystalline alloy.</p>

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Structural Evolution, Magnetic Behavior and Thermal Stability of Mechanically Alloyed Fe50Co40Ni10 Nanocrystalline Powders

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • T. Gouasmia,
  • N. Loudjani,
  • M. Bououdina

摘要

Fe50Co40Ni10 nanocrystalline powders were synthesized by mechanical alloying (MA) for various durations, in order to investigate the evolution of their structural, morphological, magnetic and thermal properties as a function of milling time. A comprehensive characterization of the synthesized powders was performed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) with Rietveld refinement, vibrating sample magnetometry (VSM) and differential scanning calorimetry (DSC). SEM analysis revealed significant morphological evolution, transitioning from coarse, irregular particles to near-spherical agglomerates with increasing milling time. XRD and EDS confirmed the formation of a solid solution within the body-centered cubic (bcc) Fe matrix. Rietveld refinements indicated a gradual decrease in lattice parameter from 0.2866 to 0.2855 nm, a crystallite size reduction to ~ 8 nm and an increase in lattice strain to ~ 0.6% after 48 h of milling. Magnetic measurements demonstrated a peak coercivity ( \({H}_{\text{C}}\) H C ) of ~ 82 Oe and a saturation magnetization \({(M}_{\text{S}})\) ( M S ) of ~ 160 A·m2/kg, highlighting the role of microstructural refinement in enhancing the soft magnetic behavior of the nanocrystalline alloy. DSC analysis identified exothermic peaks at 300 °C and 450-500 °C, corresponding to residual stress relaxation, allotropic phase transformation, oxidation and atomic reordering, providing insights into the thermal stability of prepared nanocrystalline alloy.