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Some high-entropy alloys, which contain two or more component phases with highly different properties, can achieve an outstanding combination of high strength and high ductility, and even break in the strength-ductility trade-off. However, a detailed atomic-scale mechanism of the dynamic continuous microstructural evolution has not hitherto been performed, to limit the achievement of bulk dual-phase high-entropy alloys with the improved strength and toughness. Here we report the deformation and plasticity as well as strength in the dual-phase nanocrystalline high-entropy alloys with a variable volume fraction of face-centered-cube (FCC) and hexagonal closed-packed (HCP) phases using atomistic simulations during the tensile-straining tests. The results show that the amplitudes of additional interaction stresses and strains rely on such factors as the differences in the mechanical property and volume fraction of …