Study of the structure and properties of Al-Si alloy irradiated by electron-ion-plasma

The paper describes a two -stage modification of the surface layer of the hypereutectic Al-20 %Si alloy that combines electroexplosive alloying by the Al-Y2O3 system with subsequent irradiation by a pulsed electron beam. It is shown that, irrespective of the modification mode, a multilayer structure is formed consisting of the following layers: the surface layer and the intermediate layer. The surface layer is a multiphase material, the thickness of which varies within 1 i.um. The thickness of the intermediate layer varies within 40 i.um. The two -stage treatment, which combines electroexplosive alloying with subsequent pulsed e -beam irradiation at an electron beam energy density of 25 J / cm(2), is accompanied by an increase in the wear resistance of the modified samples by 7.9 times and a decrease in the friction coefficient by 1.7 times relative to silumin in the initial state. It was found that an increase in the energy density of the electron beam up to 35 J / cm(2 )is accompanied by an increase (relative to the samples modified at E-s = 25 J/cm(2)) in the silumin wear parameter by 2.1 times, friction coefficient by 1.13 times, remaining, however, higher than the indicated characteristics of silumin in the initial state.