Effects of Tungsten-Carbide Particle Addition on Friction-Stir-Processed Fe50(CoCrMnNi)50 Medium-Entropy Alloy
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The Fe50(CoCrMnNi)50 medium-entropy alloy can be considered a bridging alloy between the multicomponent medium- and high-entropy alloys and conventional steels. In this study, the combined effect of friction stir processing (FSP) and addition of WC-rich particles on the microstructure and mechanical properties of Fe50(CoCrMnNi)50 was investigated. The parameters of tool rotation speed and stir speed of the FSP were fixed at 400 rpm and 0.3 mm/s, respectively. In the stir zone, formation of ultrafine grains was observed, owing to the interrelated combination of dynamic recrystallization by the FSP, particle-stimulated nucleation, and grain-coarsening inhibition by the WC-rich particles. The combined utilization of FSP and WC-rich particles significantly improved the mechanical properties of Fe50(CoCrMnNi)50, owing to the Hall–Petch grain boundary and particle hardening.
This study was supported by the National Research Foundation of Korea funded by the Korean government [Ministry of Science, ICT and Future Planning, MSIP; NRF-2015R1C1A1A01052856].
Conflict of Interest
The authors declare no conflict of interest.
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