Large-size high-strength and high-ductility AlCoCrFeNi_2.1 eutectic high-entropy alloy produced by hot-rolling and subsequent aging

Improving the strength and ductility of small-size AlCoCrFeNi_2.1 eutectic high-entropy alloy by thermo-mechanical processing has been successfully achieved; whereas, its feasibility for large-size AlCoCrFeNi_2.1 has not been evaluated yet. The current study demonstrates that both cold-rolling and warm-rolling cannot severely deform large-size AlCoCrFeNi_2.1 probably due to large intrinsic deformation resistance and increased casting defects. Instead, hot-rolling successfully deforms large-size AlCoCrFeNi_2.1 and achieves outstanding tensile properties comparable to the cold-rolling. This finding paves the way for engineering application of AlCoCrFeNi_2.1.