Abstract
The utilization of conventional Fe–Co soft magnetic materials (SMMs) as essential materials in electric motors and electromagnets is well-established, however, their mechanical properties cannot be further improved. In order to achieve an excellent balance between mechanical and soft magnetic properties, a novel FeCoNi-based medium entropy composite (MEC) reinforced with in-situ synthesized TiC was designed and prepared via mechanical alloying (MA) and spark plasma sintering (SPS). After the SPS process, the developed MEC exhibited a heterogeneous microstructure consisting of ultra-fine face-centered cubic (FCC) grains, micron-sized FCC grains and in-situ nanosized particles. This resulted in exceptional mechanical properties, with a high tensile yield strength of 910 MPa, combined with a total elongation of 10.9%. The superior mechanical properties of the MEC were attributed to dispersion strengthening, hetero-deformation induced (HDI) strengthening and solid solution strengthening. Additionally, the TiC/FeNiCo MEC also exhibited excellent soft magnetic properties, displaying a high saturation magnetization of 141 emu/g and low coercivity of 619 A/m. Therefore, these results demonstrate the potential of the developed MEC to serve as a promising soft magnetic material (SMM) for future applications.
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