Ultrafine-Grained AlCoCrFeNi2.1 Eutectic High-Entropy Alloy

By I. S. Wani, T. Bhattacharjee, S. Sheikh, Yiping Lu, Subhradeep Chatterjee, P. Bhattacharjee, Sheng Guo, N. Tsuji. 2016

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The development of microstructure and mechanical properties was investigated in a heavily cold-rolled and annealed AlCoCrFeNi2.1 high-entropy alloy. The as-cast alloy having a eutectic morphology consisting of alternate bands of ordered L12 and B2 phases was 90% cold-rolled. The deformed microstructure showed profuse shear banding and disordering of the L12, but no transformation of the B2 phase. A duplex microstructure consisting of ultrafine equiaxed grains (∼0.60 µm) of disordered face centered cubic and B2 was observed after annealing at 800°C. The annealed material showed remarkable strength–ductility combination having ultimate tensile strength ∼1.2 GPa and elongation to failure ∼12%. Impact Statement: AlCoCrFeNi2.1 eutectic HEA with ordered L12 and B2 phases can be thermo-mechanically processed to achieve ultrafine structure and remarkable strength-ductility properties. GRAPHICAL ABSTRACT

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/344911728f1ef9dbee7de19a62ee96c8d615b51d