Kinetics of dislocation ensembles in deformable irradiated materials

The development of plastic instability in the initial deformation stages of irradiated materials is studied. The dependence of the fraction of dislocations which overcome obstacles in the dynamic regime (dislocation ‘‘channeling’’) on the degree of radiation hardening (irradiation dose) and the dislocation velocity is analyzed. It is shown that this effect plays a role in radiation embrittlement of reactor materialsyesBelgorod State Universit

Role of internal stresses in the localization of plastic flow of irradiated materials

The collective behavior of dislocations in irradiated materials is studied using the kinetic equation for the dislocation density, taking account of a Burgers-type nonlinearity. It is shown that the degree of dislocation localization in slip bands is higher in the irradiated materials than in the unirradiated materialsyesBelgorod State Universit

Kinetics of variation of electrical resistance and yield strength in technically pure nickel due to loading in the elastic range at 300-77 K

Results of a study of the variation in yield strength and electrical resistance of technically pure nickel in different initial structural states as a function of the test temperature and applied stress are presented. Possible mechanisms affecting the physical and mechanical properties of the studied nickel are explainedyesBelgorod State Universit

Effect of pulse flows of charged particles on the structure and mechanical properties of metals

We investigate the effect of pulse flows of hydrogen, helium, and hydrogen-helium plasma of a specific power of 20-30 GW/m² on the surface structure and mechanical properties of vanadium, niobium, and Kh16N15M3B and Kh18N10T austenitic stainless steelsyesBelgorod State Universit

Accelerators simulation of structure-phase evolution and radiation resistance of materials for nuclear reactors

At this presentation activity of KIPT which during many years was involved into the field of simulation and investigation of Radiation Damage in reactor materials, is described. Well known that charge particle accelerators are widely used for the purpose of obtaining express information on radiation resistance and investigating physical nature of the radiation. During irradiation with charged particle beams one could reproduce and examine under well-controlled conditions practically all the known radiation effects and investigate physical nature of these effects in more detail. Simulation experiments together with results of reactor investigation much contribute to radiation physics phenomena, radiation and ion-beam technologies as well as solving problems of creation low-activated materials with good radiation resistance. Modern status of simulation experiments in investigation of structure-phase transformations in reactor materials during irradiation is discussed.В представленій роботі описано діяльність ХФТІ протягом багатьох років в галузі імітації та дослідженні радіаційного пошкодження реакторних матеріалів. Добре відомо, що прискорювачі заряджених часток широко використовуються з метою отримання експрес-інформації щодо радіаційної стійкості і для вивчення фізичної природи випромінювання. У процесі опромінення пучком заряджених часток можна відтворити та дослідити в добре контрольованих умовах практично всі відомі радіаційні ефекти, а також дослідити фізичну природу цих ефектів більш докладно. Імітаційні експерименти нарівні з реакторними випробуваннями вносять вагомий вклад в явища радіаційної фізики, радіаційні та іонні технології, а також в рішення проблем слабкоактивуємих матеріалів з високою радіаційною стійкістю. Обговорюється сучасний статус імітаційних експериментів в дослідженні структурно-фазових перетворень в реакторних матеріалах під опроміненням.В предлагаемой работе приводится описание деятельности ХФТИ на протяжении многих лет в области имитации и исследования радиационного повреждения реакторных материалов. Хорошо известно, что ускорители заряженных частиц широко применяются с целью получения экспресс-информации о радиационной стойкости и для исследования физической природы излучения. В процессе облучения пучком заряженных частиц можно воспроизвести и исследовать в хорошо контролируемых условиях практически все известные радиационные эффекты, а также исследовать физическую природу этих эффектов более подробно. Имитационные эксперименты наряду с реакторными испытаниями вносят весомый вклад в явления радиационной физики, радиационные и ионные технологии, а также в решение проблем создания слабоактивируемых материалов с высокой радиационной стойкостью. Обсуждается современный статус имитационных экспериментов в исследовании структурно-фазовых превращений в реакторных материалах под облучением

Programmed strengthening of crystalline materials using copper and aluminum as an example

Fundamental propositions of the well-known method of programmed strengthening of crystalline solids are described. It is shown that when mechanical (deformation) and thermal (tempering, annealing, and aging) actions are combined, the loading rate is determined by the rate of diffusion and microshear processes of relaxation of internal stresses in regions of defect accumulation and by the formation of stable complexes as a result of directional diffusion of point defectsyesBelgorod State Universit

Influence of the inert and active ion bombardment on structure of the transition metal thin films

The results of the experimental research of the inert (He, Ne, Ar, Kr, Xe) and active (O, N) ion impact on the transition metal structure are presentedyesBelgorod State Universit

On the Solvation Behavior of Graphene Oxide in Ethylene Glycol/Water Mixtures

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The self-association and solvation pattern of graphene oxide (GO) in water, ethylene glycol (EG), and their mixtures were analyzed by means of UV/Vis spectrophotometry. A careful analysis of the absorbance dependencies vs. the GO concentration shows that self-association of the GO sheets in EG occurs at higher concentration compared to that in water. It was established that depending on the mixed solvent composition, two different types of the GO solvates are formed. The results of quantum chemical calculations allow one to suggest that in the water-rich compositions, the GO oxygen-containing groups are in direct contact with water molecules while in the glycol-rich media the EG molecules fully substitute water in the GO's first solvation layer

On athermic mechanism of materials radiation embrittlement

To elucidate the mehanisms of radiation embrittlement of materials the temperature dependence of mechanical properties of irradiated materials has been studiedyesBelgorod State Universit

Effect of strain aging on physical and mechanical properties of austenitic chromium-nickel steel

The processes occurring in chromium-nickel steel 08Kh18N10T due to strain aging are studied. The tensile mechanical properties are determined. Relaxation tests and metallographic and x-ray diffraction analyses are performed. The internal energy state of the steel is estimated with the help of acoustic emissionyesBelgorod State Universit