Applied Physics and Mathematics Annotation << Back MODEL OF FORMATION OF NANOCOMPOSITE LAYERS ON METAL SURFACES WHEN ELECTRO-EXPLOSIVE ALLOYING A.V. IONINA The paper presents a new mechanism for the formation of a nanostructured layer in the near-surface doping zone during pulsed plasma treatment of metals. The mechanism is based on the Kelvin-Helmholtz instability (KG), which occurs at the interface between the plasma and the melt. The instability of the KG leads to the formation of waves at the interface, which then disintegrate into small droplets. These droplets solidify to form a nanostructured layer. The proposed mechanism allows us to explain: the penetration of alloying elements into the depth of the alloying zone; more uniform alloying compared with traditional methods. To quantify the mechanism, a dispersion equation for the KG problem is obtained, taking into account viscous and capillary stresses in the melt. The dependence of the increment on the wavelength of surface disturbances is analyzed. It is shown that the increment has a maximum in the nanometer range at a relative plasma and melt velocity in the range of 100–1000 m/s, achieved under processing conditions. A model is proposed to explain the undulating nature of the interface between the zone of electroexplosive alloying (EVL) and the metal base. The model is based on: the development of instability of KG at the melt-plasma interface; resonant interaction of KG waves with inhomogeneities of the interface. Numerical calculations have been carried out, which confirm the proposed mechanism. The dependence of the amplitude of the boundary oscillations on time is obtained. The process of blurring the boundary due to percolation mixing is described Keywords: alloying, pulse processing, melt, hardening mechanisms, plasma, Kelvin-Helmholtz instability, nanostructured layer DOI: 10.25791/pfi m.02.2024.1290 Pp. 03-13.