Hetero-Deformation Induced Hardening in a CoCrFeNiMn High-Entropy Alloy

One of the most important issues in materials science is to overcome strength–ductility trade-off engineering alloys. The formation heterogeneous and complex microstructures a useful approach achieving this purpose. In investigation, CoCrFeNiMn high-entropy alloy was processed via cold rolling followed by post-deformation annealing over temperature range 650–750 °C, which led wide grain sizes. Annealing at 650 °C structure containing recrystallized areas with ultrafine fine grains non-recrystallized an average size ~75 μm. material showed synergy very high strengths ~1 GPa uniform elongations 12%. Different deformation mechanisms such as dislocation slip, twinning hetero-deformation-induced hardening were responsible for mechanical property. Increasing up 700 facilitated acquisition bimodal distributions ~1.5 ~6 μm, eliminated higher temperatures, significant decrease strength.