K. A. Mikhailov

Modifying the composition of a brass and bronze surface layer under a high power ion beam of a nanosecond duration

The change in the composition of the surface layers of brass LS59-1 and bronze BrOS10-10 under the action of a high power ion beam has been studied. Zinc depletion of the brass surface at a beam current density of j ∼50 A/cm2 is shown; zinc enrichment of the surface layer is observed at j > 150 A/cm2, and a thin zinc layer is found to be formed across the entire surface. For bronze BrOS10-10, tin enrichment of the surface is registered only under a multiple effect of the beam at j >150 A/cm2. Various mechanisms of modifying the elemental composition are considered.

Surface structuring of polycrystalline magnesium under the action of high-power ion beam of nanosecond duration

The formation of periodic structures and micro- and nanoparticles on the surface of polycrystalline magnesium under the action of a high-power proton-carbon ion beam of nanosecond duration have been studied. Spatial parameters of the observed structures and dimensions of particles are determined and possible mechanisms of their formation are considered.

Features of the surface morphology of brass and bronze upon irradiation with a high power ion beam

The change in the morphology and surface composition of copper alloys (brass LS 59-1, bronzes BrOS 10-10 and BrAJ 9-4) upon irradiation with a high power ion beam of nanosecond duration is studied. It is shown that craters are mainly formed at the location of lead or sulfur inclusions. The reverse deposition of zinc onto the surface of brass is found. Possible mechanisms of these phenomena are considered.

Nanostructuring of the surface of aluminum alloys under irradiation by a high-power ion beam

The surface morphology of aluminum alloys under irradiation by a high-power nanosecond ion beam with a low current density is investigated. The possible factors responsible for the change in the surface relief are considered.

Influence of copper alloy microheterogeneities on the formation of surface relief under high power ion beam irradiation

Changes in the morphology and surface composition of copper alloys (L63 brass, VB23NTs bronze, and a Cu-Al alloy) containing components with different degrees of volatility, under the action of a high power ion beam of nanosecond duration, are investigated. It is demonstrated that various alloy components affect the formation of surface craters during ion beam irradiation. The probable mechanisms of the observed phenomena are discussed.

Structural evolution of copper alloys under high-power ion-beam irradiation

Structural and phase transformations in copper and its alloys—brass and bronze, irradiated by a high-power ion beam are investigated by X-ray diffraction and scanning-electron microscopy. It is established that the phase reconstruction in brass is caused by the partial removal of zinc from the surface and its diffusion toward the surface from deeper surface layers. Copper and bronze undergo only structural transformations induced by the growth of stresses of type I, II, and III and dislocation density.

Periodical structure formation on a magnesium and aluminum surface under high power ion beam irradiation of nanosecond duration

AbstractsThe formation of periodical structures, and also, micro- and nanoparticles on a polycrystalline magnesium and aluminum surface under high power proton-carbon beam irradiation has been investigated. The spatial parameters of these structures and particle sizes have been determined. The possible mechanisms for periodical structure formation have been considered.

Effect of preheating on the morphology of an aluminum alloy surface under irradiation with a high-power ion beam

The effect of a high-power ion beam with nanosecond duration and a current density of 150 A/cm2 on the surface of a preliminarily heated D16T aluminum alloy is studied using scanning electron microscopy and X-ray microanalysis. It is shown that, at a temperature of 300°С, the average size of the craters decreases by a factor of 3.6 and the surface density of the craters decreases fourfold. A possible mechanism for the effect of alloy preheating on the formation of the surface morphology under such the action is discussed.

Formation of regular structures on the surface of metals under the effect of a high-power ion beam of nanosecond duration

The formation of regular structures, microparticles on the surface of polycrystalline metals (magnesium, zinc, and aluminum) under the multiple effect of a nanosecond high-power ion beam with a current density from 50 to 150 A/cm2, is investigated. The spatial parameters of the relief, which are in the limits of 8–40 μm for studied metals, are investigated. The size of particles appearing during the formation of this relief is from 0.1 to 1.5 μm. The appearance of regular structures is attributed to the excitation of capillary waves on the melt surface.

Specific features of high-power nanosecond ion beam action on polycrystalline bismuth

Specific features of surface relief formation on a polycrystalline bismuth target under the action of a high-power proton-carbon ion beam of nanosecond duration have been studied. Local melt extrusion from subsurface layers and its crystallization on the surface is observed, which is explained by a significant (3.35%) thermal expansion of bismuth during the transition from liquid to solid state.