STRESS-STRAIN STATE MODELLING OF THE Al-Co-Cr-Fe-Ni HIGH-ENTROPY ALLOY SYSTEM AFTER ELECTRON BEAM TREATMENT

10.25712/ASTU.1811-1416.2022.03.010

Abstract

In this paper, we carried out finite element modeling of the stress-strain state of a process of uniaxial compression of a high-entropy alloy of the Al-Co-Cr-Fe-Ni system treated with an electron beam with energy densities from 10 to 30 J/cm². The elastic modulus in the cross section of the samples was measured by scanning force probe microscopy at different distances from the treated surface. The obtained values of the elastic modulus were used to set the properties in the finite element model. It was found that with an increase in the electron beam energy density, the modulus of elasticity decreases by 21 % at 10 J/cm², by 30% at 20 J/cm² and by 44 % at 30 J/cm², compared with the initial material. The results of finite element modeling of the stress-strain state of a high-entropy alloy after electron-beam processing demonstrated a decrease in the value of internal stresses in the treated layer that occur during uniaxial compression by up to 32 % at 20 J/cm². The obtained results allow us to conclude that the increase in the strength and plasticity of the investigated high-entropy alloy, established in the previous study, may be due to the presence of a more viscous surface layer.