Abstract
The microstructural changes and flow behavior under hot compression at a temperature of 1173 K were examined for a six-component (CoCrFeMnNi)92Al8 high-entropy alloy. The homogenized alloy, which was a single-phase solid solution with a face-centered cubic (fcc) structure, possessed a deformation microstructure with shear bands after hot compression and exhibited steady-state flow over a wide strain range. In contrast, the thermomechanically processed alloy, which was composed of an unrecrystallized fcc matrix and second phases (bcc and σ), comprised fully recrystallized matrix grains of 0.8 µm diameter after hot compression and displayed gradual strain softening from the early stages of deformation. The results demonstrated that the dense dispersion of the second phases in the thermomechanically processed alloy was quite effective for attaining fine grains by dynamic recrystallization upon hot deformation.
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