Atomic-scale insight into mechanical properties and deformation behavior of crystalline/amorphous dual-phase high entropy alloys

Abstract

The effect of amorphous phase thickness, crystal grain size and element content on the deformation mechanism and mechanical properties of the crystalline/amorphous dual-phase high entropy alloys (HEAs) are investigated by molecular dynamics simulation. The results indicate that with the increase of amorphous phase thickness or the decrease of grain size, the plastic deformation mode of the HEA gradually changes from dislocation slip in crystalline phase to the movement of shear band dominated by amorphous phase. The results also show that changing the component content of the crystalline phase can not only increase the strength of the HEA, but also improve its plasticity to a certain extent, so as to obtain the HEA with high strength and good plasticity.