Персона: Шеляков, Александр Васильевич
Загружается...
Email Address
Birth Date
Научные группы
Организационные подразделения
Организационная единица
Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
Статус
Фамилия
Шеляков
Имя
Александр Васильевич
Имя
51 results
Результаты поиска
Теперь показываю 1 - 10 из 51
- ПубликацияТолько метаданныеInfluence of the holding temperature on the kinetics of the isothermal B2 → B19′ transformation in TiNi-based shape memory alloy(2020) Demidova, E.; Belyaev, S.; Resnina, N.; Shelyakov, A.; Шеляков, Александр Васильевич© 2019, Akadémiai Kiadó, Budapest, Hungary.The aim of the present paper was to study the kinetics of the isothermal B2 → B19′ transformation in the quaternary Ti40.7Hf9.5Ni44.8Cu5 shape memory alloy in a wide temperature range to find the common features of this phenomenon in NiTi-based alloys. It was found that the isothermal B2 → B19′ martensitic transformation occurred during holding at a constant temperature both within and outside of the temperature range of the forward transformation. The holding temperature of T* influenced the maximum value of the martensite phase (ΦM) that appeared under isothermal condition and the rate of the martensite volume fraction variation. The maximum ΦM value of 80% was found when holding was at T* = Ms (the start temperature of the forward martensitic transformation on cooling), and it was two times larger than in quenched Ni51Ti49 alloy. An increase in holding temperature larger than Ms decreased the maximum ΦM value and the slope of the ΦM(t) curve. A decrease in the holding temperature less than Ms decreased the ΦM value and hardly influenced the dΦM/dt value. It was found that the variation in volume fraction of the martensite phase that appeared under isothermal holding at different temperatures in the Ti40.7Hf9.5Ni44.8Cu5 shape memory alloy was close to the binary Ni51Ti49 alloy, and hence, it was concluded that the features of the kinetics of the isothermal B2 → B19′ transformation were common for this type of transformation in non-stoichiometric NiTi-based alloys.
- ПубликацияТолько метаданныеStudy of the Structure, Phase Transformations, and Shape Memory Effect in Amorphous-Crystalline TiNiCu Alloy(2025) Shelyakov, A. V.; Sitnikov, N. N.; Khachatrian, D. A.; Zaletova, I. A.; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Хачатрян, Давид Арменович
- ПубликацияТолько метаданныеTwo-Way Shape Memory Effect in Rapidly-Quenched High-Copper TiNiCu Alloys Deformed in the Martensitic State(2020) Shelyakov, A. V.; Sitnikov, N. N.; Borodako, K. A.; Sevryukov, O. N.; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Бородако, Кирилл Анатольевич; Севрюков, Олег Николаевич© 2020, Pleiades Publishing, Ltd.Abstract: The effect of martensitic deformation on the two-way shape-memory effect (SME) of quasi-binary high-copper TiNi–TiCu alloys (with 25–40 at % Cu) is studied. The alloys are prepared by rapid quenching from the melt in an amorphous state in the form of ribbons 30–50 μm in thickness. The alloys crystallize during isothermal annealing, the time of which is varied from 100 to 300 s, and during a single current pulse 10 ms in duration. The relatively low bending strains (1.5–3%) are shown to cause two-way SME in TiNiCu alloys; as the strain of martensite increases, the reversible strain in the martensitic transformation range increases markedly. An increase in the copper content is found to cause a substantial decrease in the value of two-way SME, which is related to the formation of the brittle TiCu phase. At the same time, a decrease in the heat treatment time causes an increase in the reversible strain, which reaches the maximum value (2.35%) for the alloy with 25 at % Cu subjected to high-rate electric pulse treatment.
- ПубликацияОткрытый доступТЕРМОМЕХАНИЧЕСКИЕ СВОЙСТВА БЫСТРОЗАКАЛЁННОГО СПЛАВА TiNiCu С ЭФФЕКТОМ ПАМЯТИ ФОРМЫ ПРИ ЭЛЕКТРОИМПУЛЬСНОЙ КРИСТАЛЛИЗАЦИИ(НИЯУ МИФИ, 2026) ЗИМИН, М. В.; ФРАНЦУЗОВ, Г. В.; ЗАБРОДИН, П. К.; БОРОДАКО, К. А.; ШЕЛЯКОВ, А. В.; СИТНИКОВ, Н. Н.; АБИН, Д. А.; Ситников, Николай Николаевич; Бородако, Кирилл Анатольевич; Шеляков, Александр Васильевич; Абин, Дмитрий АлександровичИсследуется влияние электроимпульсной обработки на термомеханические свойства сплава TiNiCu с эффектом памяти формы. Разработана лабораторная установка для электроимпульсной обработки. Установлено влияние параметров обработки (длительность и энергия импульса) на термомеханические свойства сплава. Показано улучшение характеристики памяти формы и сужение температурного гистерезиса при сокращении времени обработки.
- ПубликацияТолько метаданныеDevelopment of a method of inactivation of individual sensilla of insects using microtool with shape memory effect(2021) Borodako, K.; Koledov, V.; Zhukovskaya, M.; Lunichkin, A.; Shelyakov, A.; Шеляков, Александр Васильевич© 2021 IEEE.Present work considers the study of sensilla, which are sensitive elements of insect sensory systems. Sensilla are believed to be efficient nanobiosensors, the subtle mechanisms of operation of which have not been sufficiently studied. Different types of sensilla allow the insect to receive mechanical stimuli (air currents, sound, touch). To study mechanosensory sensilla, a micromechanical instrument is needed that would allow the capture of sensilla and its deflection in a predetermined manner. The paper proposes a method for recording the activity of a mechanosensory neuron during inactivation of individual sensilla by means of microtweezers based on the shape memory effect.
- ПубликацияТолько метаданныеFunctional Properties of Cold-Rolled Rapidly Quenched Ribbons of Shape Memory TiNiCu Alloy(2024) Borodako, K.; Borodako,K.; Bondarev, N.; Koledov, V.; Бородако, Кирилл Анатольевич; Шеляков, Александр Васильевич
- ПубликацияТолько метаданныеINFLUENCE OF INITIAL STATE AND HEAT TREATMENT CONDITIONS ON THE STRUCTURE OF RAPIDLY-QUENCHED TiNiCu ALLOY(2021) Dyadechko, A. A.; Zaletova, I. A.; Shelyakov, A. V.; Sitnikov, N. N.; Borodako, K. A.; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Бородако, Кирилл Анатольевич© 2021, Pleiades Publishing, Ltd.Abstract: Amorphous-crystalline alloy of the TiNi–TiCu quasi-binary system with 25 at.% copper content is prepared in the form of thin ribbons by rapid quenching from a liquid state. Completely amorphous ribbons are obtained using electrochemical polishing. It is shown that the crystal structure prepared by high-speed electropulsing heat treatment differ significantly from that prepared by isothermal heat treatment. The initial ribbon crystallizes as column-like crystals growing from both surfaces of the ribbon and as large lens-like crystals in the volume of the ribbon. The structure of column-like crystals reproduces the morphology and texture of the original crystalline layer. Reducing the electropulsing time to 1 ms increases the fraction of column-like crystals while their height increases and the width decreases. After the amorphous ribbon is crystallized, the structures of column-like crystals on both surfaces have similar crystallographic orientations.
- ПубликацияТолько метаданныеFeatures of the Formation of the Crystalline Phase in Rapidly Quenched Amorphous Crystalline Ribbons of Ti50Ni25Cu25 Alloy Depending on Energy Input during Electropulse Treatment(2025) Sitnikov, N. N.; Greshnyakova, S. V.; Zaletova, I. A.; Shelyakov, A. V.; Ситников, Николай Николаевич; Шеляков, Александр Васильевич
- ПубликацияТолько метаданные3D nano-manipulation and nano-assembling by the smallest and the fastest shape memory alloy nano-tools(2019) Koledov, V.; Von, Gratowski, S.; Lega, P.; Cotta, M.; Shelyakov, A.; Шеляков, Александр Васильевич© 2019 IEEE.The shape memory alloys (SMAs) have recently been recognized as reliable basement of the technology of mechanical nanotools with still non determined minimal size. Among them the intermetallic alloy Ti(NiCu) give promising possibilities to create the reconfigurable micro- and nanostructures with shape memory effect (SME) capable to produce mechanical work on nanoscale. In the present report the review of the basic physical phenomena, which provide the possibility for the application of nanostructured SMA Ti(NiCu) for creating of micro and nanotools is given. The preliminary strained layered composites of SMAs are discussed which provide the multiple reversible actuation of a SMA based tool. Fundamental studies devoted to search for minimal size, at which martensitic phase transition and controllable actuation of SMA based tools take place are described. The technology of SMAs treatment by FIB-CVD gives the possibility to create different kinds of micro and nanotools, like nano- tweezers, grippers, pinchers, screws etc. These micro-nanotools have active SME layer with the thickness from tenths nm to 1 μm The continuous bending actuation threshold frequency of the SMA based thermally controlled nanoactuator is proved to exceed 8000 Hz. The new mechanical nanotools with SME give possibility to provide 3D nanomanipulation of the real nano-objects such as CNTs, different nanowires, nanowhiskers and also bio-nanoobjects such as DNA, etc. One of very interesting fundamental physical question which arises at nano-manipulation is the restriction due to influence of Casimir and van der Waals forces between the interacting nanotools and objects to be manipulated.
- ПубликацияТолько метаданныеSpecifics of Crystallization of Amorphous TiNiCu Alloys with High Concentrations of Copper(2020) Khabibullina, I. A.; Sundeev, R. V.; Shelyakov, A. V.; Sitnikov, N. N.; Sevryukov, O. N.; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Севрюков, Олег Николаевич© 2020, Pleiades Publishing, Ltd.Abstract: Ribbons of alloys of the quasi-binary TiNi–TiCu system with 25, 30, 35, and 40 at % copper were fabricated by planar flow casting at a cooling rate of 106 K/s. The thickness of the ribbons was 30–50 μm, and their width was 10–20 mm. The structure and phase transformations of alloys were studied using electron microscopy, X-ray diffraction, and differential scanning calorimetry. It was found that the alloys with 25 and 30 at % Cu in the initial state have an amorphous-crystalline structure, which undergoes one-stage polymorphic crystallization of the amorphous state with the formation of austenitic phase B2 under heating in a calorimeter. When cooled to room temperature, phase B2 undergoes a martensitic transformation to orthorhombic phase B19. It was demonstrated that the alloys with 35 and 40 at % Cu become amorphous when quenched and undergo two-stage (primary and eutectic) crystallization under heating. The resulting structure is two-phase (tetragonal phase B11 (TiCu) with a small fraction of phase B2). An increase in the concentration of copper leads to a reduction in the onset temperature of crystallization.