V. S. Kovivchak

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.

Fracture of the surface layers of soda-lime glass under high-power ion beam irradiation

The fracture of the surface layers of soda-lime glass under irradiation with a high-power ion beam of nanosecond duration is investigated. Features of the fracture surface morphology and the depth of spall crack localization in glass are defined. The depth was 10 ± 2 μm after one-time irradiation with a current density of 100 A/cm2. With the use of X-ray diffraction analysis the change in the residual tensile stresses in the surface layers of glass after irradiation is evaluated. The possible mechanisms of the observed fractures are discussed.

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.

Formation of preferred orientations in aluminum, copper, and nickel irradiated with intense ion beams

The formation of preferred orientations in metal targets under exposure to intense ion beams was studied using x-ray diffraction. The formation of axial textures with [111] and [100] axes, observed in aluminum, copper, and nickel samples, depends on both the ion current density and thermal characteristics of the target material. In the case of rapid propagation of the thermal front to the material depth, the texture is apparently formed by the dislocation mechanism, which occurs in copper samples having the highest thermal conductivity. For aluminum and nickel, the most probable are recrystallization and regrowth mechanisms, respectively. An analysis of inverse pole figures showed that the main direction of heat sink in textured samples corresponds to the normal to the (111) atomic plane.

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.

Microstructure of metals and alloys in the heat-affected zone produced by a high-power ion beam

The microstructure of heat-affected zones produced by high-power ion beams in Al, Cu, Ni, and AD1 and Monel alloys are investigated by optical and scanning electron microscopy and X-ray diffraction analysis. It is ascertained that the microstructure is divided into characteristic layers differing in terms of grain sizes and phase components. It is shown that the formation of the structural-phase states of each layer occurs in both solid and liquid phases under pulsed ion-beam treatment and depends on the irradiation parameters and the thermophysical characteristics of a target.

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.