High strength and ductility in a dual-phase hetero-structured AlCoCrFeNi <sub>2.1</sub> eutectic high-entropy alloy by powder metallurgy
Siyuan Peng, Shuai Feng, Zhenfei Jiang, Jie Ren, Shengbiao Zhang, Yanfang Liu, Liang Zhang, Wenyi He, Zhongqiang Liu, Shuai Guan, Zhiyu Xiao, Wen Chen
Abstract
We used powder hot extrusion followed by annealing to fabricate a dual-phase AlCoCrFeNi2.1 eutectic high-entropy alloy consisting of both non-recrystallized and recrystallized grains with dense nano-sized precipitates arranged in heterogeneous structures. The resulting alloy exhibits superior tensile properties with a yield strength of ∼1.2 GPa, an ultimate tensile strength of ∼1.5 GPa, and a uniform elongation of ∼18%. Such multiscale microstructure results in exceptional strain hardening of the AlCoCrFeNi2.1 alloy by activating remarkable hetero-deformation induced (HDI) stresses. Our study provides an effective approach to fabricating high-performance structural materials via dual-phase heterogeneous microstructure design.