Abstract
Suction-cast AlCoCrFeNi equiatomic high entropy alloy rods were prepared, and then the development of microstructure was investigated by the progress of annealing and compression at 1100°C. Both film-type and particle-shape fcc grains were generated at the expense of disordered A2 bcc at the initial stage of annealing. However, prior coarse bcc grains still remained without any sign of lattice rotation, recrystallization, or grain refinement by the progress of annealing. By high-temperature compression at 1100°C, phase transformation, twin boundary generation, and dynamic recrystallization play a significant role in the refinement of both the newly generated fcc and the remained B2 bcc grains. Since brittle and disordered A2 bcc region was replaced by fine, equiaxed, soft and tough fcc phase, multi-phase refining of suction-cast AlCoCrFeNi HEA can be proposed as a promising structural materials having considerable ductility without much expense of strength by means of feasible thermomechanical processing.
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