A strategy for improving the mechanical properties of crystalline/ amorphous high-entropy alloys

T Ye and SL Li and WB Yang and JM Chen and MR An and CX Wang, MATERIALS TODAY COMMUNICATIONS, 47, 113113 (2025).

DOI: 10.1016/j.mtcomm.2025.113113

The mechanical properties and plastic deformation mechanism in a CoCrFeMnNi high-entropy alloy (HEA) with a variable volume fraction ((3) of face-centered-cube phases, as well as the amorphous layer thickness (d), are investigated using atomistic simulations. The results suggest the dependence of mechanical properties and plastic deformation mechanisms on both the (3 value and d. The effect of (3 on the mechanical properties of CoCrFeMnNi HEA is negligible when the d is large, attributed to the proliferation of the shear transformation zones and the formation of uniform shear bands in the amorphous phase. However, the effect of (3 on the mechanical properties of CoCrFeMnNi HEA is obvious in polycrystalline counterpart. Besides, the introduction of amorphous boundary with d= 1 nm is an effective strategy for improving Young's modulus and flow behavior of polycrystalline HEAs, attributing to the synergy of crystalline and amorphous phases.

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