In this paper, a new Co₁₀Fe₁₀Mn₃₅Ni₃₅Zn₁₀ high entropy alloy (HEA) is identified as a strong candidate for the single face-centered cubic (FCC) structure screened using the upgraded TCFE2000 thermodynamic CALPHAD database. The Co₁₀Fe₁₀Mn₃₅Ni₃₅Zn₁₀ HEA is fabricated using the mechanical (MA) procedure and pressure-less sintering method. The Co₁₀Fe₁₀Mn₃₅Ni₃₅Zn₁₀ HEA, which consists of elements with a large difference in melting point and atomic size, is successfully fabricated using powder metallurgy techniques. The MA behavior, microstructure, and mechanical properties of the Co₁₀Fe₁₀Mn₃₅Ni₃₅Zn₁₀ HEA are systematically studied to understand the MA behavior and develop advanced techniques for fabricating HEA products. After MA, a single FCC phase is found. After sintering at 900°C, the microstructure has an FCC single phase with an average grain size of 18 μm. Finally, the Co₁₀Fe₁₀Mn₃₅Ni₃₅Zn₁₀ HEA has a compressive yield strength of 302 MPa.

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  Current Applied Physics.2024; 59: 85.     CrossRef
• Fabrication, microstructure and mechanical property of a novel Nb-rich refractory high-entropy alloy strengthened by in-situ formation of dispersoids
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  International Journal of Refractory Metals and Hard Materials.2019; 81: 15.     CrossRef

Harmonic structure materials are materials with a core–shell structure having a shell with a small grain size and a core with a relatively large grain size. They are in the spotlight because their mechanical properties reportedly feature strength similar to that of a sintered powder with a fine grain size and elongation similar to that of a sintered powder with a coarse grain size at the same time. In this study, the tensile properties, microstructure, and stretchflangeability of harmonic structure SUS304L made using powder metallurgy are investigated to check its suitability for automotive applications. The harmonic powders are made by mechanical milling and sintered using a spark plasma sintering method at 1173 K and a pressure of 50 MPa in a cylindrical die. The sintered powders of SUS304L having harmonic structure (harmonic SUS304L) exhibit excellent tensile properties compared with sintered powders of SUS304L having homogeneous microstructure. In addition, the harmonic SUS304L has excellent stretch-flangeability compared with commercial advanced high-strength steels (AHSSs) at a similar strength grade. Thus, the harmonic SUS304L is more suitable for automotive applications than conventional AHSSs because it exhibits both excellent tensile properties and stretch-flangeability.