Abstract
The equiatomic CoCrFeMnNi high-entropy alloy (HEA) has a face-centered cubic (FCC) single-phase structure with a good balance of yield strength and elongation due to the twinning-induced plasticity (TWIP). In order to increase the usability of FCC-structured HEA, it is necessary to develop its mechanical properties. The hard precipitation of the σ-phase might be a promising strengthening mechanism. Furthermore, developing an advanced manufacturing process is necessary to apply the σ-phase-containing HEAs. This study focused on σ-phase formation during annealing after hot compression of a CoCrFeMnNi HEA. The σ-phase was primarily observed near the high-angle grain boundaries and acted as the obstacle for the boundary migration, resulting in grain growth during annealing. In addition, the development of the σ-phase according to the interface type was investigated. This microstructure increased the hardness of the alloy and may contribute to the further development of high-strength HEAs.
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