Abstract
This study aimed to improve the mechanical and soft magnetic properties of HEAs with core–shell structure. Core-shell structured SiO2 particles and interparticle insulative SiO2/FeCoNiSi0.25 soft cores were prepared by in situ chemical deposition combined with the following spark plasma sintering (SPS) process. The structure of the high-entropy alloy (HEA) formed was a single face-centered-cubic solid-solution phase. The Ms and Hc of FeCoNiSi0.25 HEA powders without and with SiO2 shell were 103.41 emu/g and 85.96 emu/g, and 177.60 Oe and 184.12 Oe, respectively. On the contrary, the Ms and Hc of the bulk FeCoNiSi0.25HEAs (SPS-ed) without and with SiO2 shell were 135.92 emu/g and 142.8 emu/g, and 5.92 Oe and 167.83Oe, respectively. The magnetic properties of SiO2/FeCoNiSi0.25 HEAs (SPS-ed) were significantly stronger than those of SiO2-free FeCoNiSi0.25, indicating that the coupling phenomenon between magnetic crystals existed.
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