Analysis of the state of the surface layer of the SAP-2 composite alloy after irradiation with a high power ion beam

Abstract

The effect of high-power ion beam of nanosecond duration on the phase composition and morphology of the surface of aluminum composite material SAP-2 has been studied. It was found that after irradiation with a high-power ion beam under all irradiation modes used in the experiments no changes in the phase composition are observed. However, the observed shifts and broadening of diffraction peaks from irradiated samples indicate the formation of residual stresses and transformation of the initial dislocation structure. The observed decrease in dislocation density resulted in a decrease in the microhardness of SAP-2 irradiated at current densities of 50 and 100 A/cm2. It is shown that the increase in the ion current density leads to an increase in the oxygen fraction in the surface layer of SAP-2, which is apparently associated with partial evaporation of aluminum and an increase in the concentration of inclusions of Al2O3, which is part of the material. A nonlinear character of the dependence of the average ratio of oxygen content to aluminum on the ion current density of the beam is observed, the maximum value of which was recorded at irradiation with a beam current density of 100 A/cm2. Intense heating of the SAP-2 surface under ion beam irradiation leads to changes in the dispersion of Al2O3 inclusions on the irradiated surface. The maximum coagulation of Al2O3 particles was found at irradiation by a powerful ion beam with a current density of 100 A/cm2.