Enhanced strength and ductility in (CoCrNi) <sub>92</sub> Mo <sub>2</sub> Al <sub>6</sub> medium entropy alloy via dual heterogeneous structures
Tian‐Cheng Li, Haiyang Chen, Yubo Huang, Qiang Hao, Hongchuan Ma, Zaifeng Zhou, Shilei Li, Yandong Wang
Abstract
In the present (CoCrNi)92Mo2Al6 medium entropy alloy (MEA), a dual heterogeneous structure is achieved by regulating the degree of recrystallization of the FCC matrix and σ phase precipitation through incomplete annealing. Compared to the alloys with single-phase FCC structure or uniform precipitation structure, this dual heterostructured MEA has superior mechanical properties by possessing the hetero-deformation-induced (HDI) hardening, precipitation strengthening and twinning-induced plasticity (TWIP) mechanism. Our research contributes to the understanding of the micromechanical behavior of heterogeneous materials and also provides a solution to the problem that precipitation increases strength at the expense of plasticity.