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[en] The mechanical behaviors of CoCrFeNiAlx (x = 0, 0.3) high-entropy alloys are investigated under quasi-static loading. Evolution of phases and microstructures is analyzed by using the x-ray diffraction, scanning electron microscope and transmission electron microscopy. A constitutive model based on the crystal plasticity theory is presented and an explicit algorithm is constructed for calculation. A dislocation-density-based description of hardening model is used to describe the strain hardening behaviors. Constitutive model validation is performed by comparing numerical results with experimental data. Evolution of dislocation density with various slip systems during plastic deformation is established to reveal the effect of Al addition on the CoCrFeNi based HEAs. (paper)
[en] Highlights: • Wear rate of nitrided HEAs was lower than that of as-cast HEAs in the same condition. • The wear mechanism of as-cast alloys in air was abrasive wear of oxide particles. • The wear mechanism of the nitrided HEAs in air was adhesive wear and abrasive wear. • The wear mechanism of HEAs in acid rain was abrasive, oxidative and corrosive wear. • The lubrication action of deionized water and acid rain led to the lower wear rate.