No abstract available

[en] Vibration spectra of carbon atoms in the α-iron irradiated by high energy electrons are studied by the method of internal friction. Samples have been irradiated by electrons with energy 4 MeV on linear accelerator up to fluences 10¹⁶-5·10¹⁷ sm^-2 at temperature not more 80 deg C. Beam current density is 1 μA/sm². Calculation of temperature dependences of internal friction were carried out by points under stabilized temperature before and after irradiation. It is shown, that form of distribution function of carbon atoms has been dissolved in α-iron by frequency of vibration changes in dependence from electron irradiation dose. The dose dependence of maximum shift of distribution function is nearly to linear one

[en] It is noted, that X-ray-structural researches of phases transformation of metals and alloys have been carrying out in Inst. of Nuclear Physics of National Nuclear Center of Republic of Kazakstan from the beginning of 1970. It were got new data about crystal structure stability of intermetallic compounds with complete regulated lattice of crystallographic classes D 0₃, D 0₁₉, D 8_1-3 under irradiation by neutron within wide range of fluences, protons and alpha-particles. It was made conclusion, that main result of inter-metalloids with D 8_1-3 structure and regulated location of atoms irradiation by cascade-forming particles are both the new phase formation or the phase with distinguish from matrix content of components. Mathematical model of separation of different kind of atoms on cascade and thermal stages of radiation damages is carried out.Generation of collision in the field of cascade is mathematically grounded. It is shown, that samples after special radiation and thermal treatment have high technological plasticity. It known, that it is practically impossible producing of compounds with similarly properties by usual technological ways without use complete power-consuming operations

[en] For pt.I see ibid., p.87-97, 1996. The chemical potential approach, making it possible for one to account for density effects in supersaturated solution of point defects, is applied to consideration of interstitial loop formation kinetics in metals under homogeneous irradiation. Quasi-chemical rate equations are reformulated in terms of chemical potential, rather than in terms of concentrations of species involved in reactions, following a procedure known in the theory of irreversible processes. The extension of rate equations is tested on a simpler model of bimolecular reactions. Then the density effect, such as radiation induced spontaneous clustering of interstitials, is investigated in irradiated metals on the background of interstitial loop formation as described by conventional rate equation solution. The phenomenon, that reveals itself by spontaneous formation of di-interstitials, would be expected to become noticeable at irradiation temperatures about 0.25 to 0.3 of the absolute melting temperature if the rate of defect generation is high enough. For a steady-state solution analyzed, the density effect brings about the higher number density of forming interstitial loops with reduced mean dimensions if compared with conventional based consideration. Possibilities of experimental investigations of the proposed mechanism of interstitial loop formation are discussed. (orig.)

[en] Method of computer simulation was used to study the interaction of accelerated ions with multilayer and multicomponent materials. To provide directional variation of irradiated material properties a software complex is developed. Profiles of radiation defect distribution in a Mo-Si multilayer composite material under ion irradiation are investigated. A study is also made into spatial distribution of energy release under electron irradiation with accounting for electron beam parameters and irradiated objects geometry. 5 refs.; 5 figs

[en] The results of the experiments on aluminium and copper samples for defining of correlation between on the one hand the of fluidity limit and electric conductivity on the other hand the width of electric fields gradients' distribution and the local variable fields intensification around different radiation defect structures. The macro-characteristics (fluidity limit, electrical conductivity, micro-hardness) has been defined by the traditional methods of the mechanical and electro-physic testing. The local fields' parameters was defined from spectrum of nuclear magnetic resonance. The analysis of received data indicates on existence of correlation between the fluidity limit and width of electrical fields gradients distribution, also between concentration and the time of nuclear spin dipole relaxation

[en] A helium concentration in a material is continuously kept to less than a concentration at which material failures are caused, by performing processings of heating the material to which neutrons are irradiated to release gaseous atoms in the material as solute atoms to the outside thereby reducing a helium concentration in the material to less than the concentration at which material failures caused. The procedures are intermittently performed within a time when the concentration is less than the concentration at which material failures are caused during the test period under a neutron irradiation circumstance. In addition, this method of integrally processing neutron-irradiated materials is applied as a pretreatment for welding. Namely, the concentration of helium in the material is continuously kept to less than the concentration at which failures of the material are caused by intermittently repeating the procedures of reducing the helium concentration in the material to lower than that before heating. Since helium concentration in the materials irradiated by neutrons is always kept low, undesired effects of helium to the welding can be suppressed, and integral welding can be performed even if welding is performed just after the welding of materials is required. (N.H.)

[en] Passive films were potentiostatically formed on AISI 304 L stainless steel, in a borate-boric acid solution, pH 9.2. Several temperatures and potentials were chosen for the formation of the films, in order to study their influence on the electronic properties of the oxide. The measurements were made by a.c. impedance, leading to Mott-Schottky plots. The films formed in the range -0.1V to +0.5V (SCE) show two slopes on the Mott-Schottky plots, whereas those formed outside that potential range show only one slope. Apparent donor densities have been determined for all the films. Chemical information relative to the composition of the films was obtained by AES and XPS

[en] The motion of charged particles in the cathode sheath of a glow discharge near the rough surface of a metal target with periodic structural inhomogeneity has been studied. Corrections to the ion current density caused by the emission nonuniformity and the roughness of target surface have been found as well as the amplitude of the equilibrium texture of the target after its sufficiently long treatment in the discharge

[en] An optical study of Ni-ion (60 and 75 MeV) bombarded polished single crystals of Ge ( left angle 111 right angle , Sb-doped, 1 Ω cm) and Si ( left angle 111 right angle , intrinsic) at room temperature with fluence ranging from 1x10¹³ to 1x10¹⁵ ions/cm² has been carried out in the spectral regions of the fundamental optical absorption edge and interband transition. The damage inflicted by the MeV energy ion on the surface and deep inside the bulk of the semiconductors has been monitored by determining the dose dependence of optical constants α, R and n in the spectral range 200-2500 nm. Analysis of the results reveals that electronic energy loss arising out of the inelastic ionising collisions of swift heavy ions, in addition to the nuclear energy loss, influence the surface and the bulk properties of the bombarded semiconductors. Formation of divacancies in the bombarded Si is supported by the appearance of an absorption band at around 0.7 eV. The surface effects of ion-implantation at MeV energy are quite different from those at keV energy. ((orig.))