Персона: Шеляков, Александр Васильевич
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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.
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- ПубликацияТолько метаданныеStrain variation during the isothermal martensitic transformation in Ti40.7Hf9.5Ni44.8Cu5 alloy(2019) Demidova, E.; Belyaev, S.; Resnina, N.; Shelyakov, A.; Шеляков, Александр Васильевич© 2019The aim of the paper was to study the strain variation during the isothermal B2 → B19′ transformation in NiTi-based alloy. It was found that isothermal holding of the Ti40.7Hf9.5Ni44.8Cu5 alloy under a stress of 235 MPa at constant temperatures, which were close to the start temperature of the B2 → B19′ transition, was accompanied by an additional strain variation. This strain was completely reversible on further heating and depended on the position of the holding temperature compared to the start temperature of the forward transformation. The maximum of isothermal strain of 2.9% was observed during holding at a temperature of 50 °C.
- 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 метаданныеSimulation of local laser annealing of amorphous TiNiCu alloy to create nanostructured functional material(2019) Borodako, K.; Koledov, V.; Shelyakov, A.; Шеляков, Александр Васильевич© 2019 IEEE.Present work considers simulation via Comsol Multiphysics software of local laser annealing of amorphous TiNiCu thin ribbon to create a layered nanostructured crystalline-amorphous functional material with the two-way shape memory effect, which is intended for manufacturing of the nanoactuator. Several simulations were performed with different parameters of laser radiation, such as pulse duration and power density. Laser treatment was simplified as a boundary heat source at sample surface.
- ПубликацияТолько метаданныеAmorphous-crystalline TiNiCu melt-spun ribbons for micromechanical applications(2019) Sitnikov, N. N.; Shelyakov, A. V.; Шеляков, Александр Васильевич
- ПубликацияТолько метаданныеInfluence of copper content and thermal treatment on shape memory effect in rapidly quenched TiNiCu alloys(2021) Borodako, K. A.; Shelyakov, A. V.; Sitnikov, N. N.; Zaletova, I. A.; Sevryukov, O. N.; Бородако, Кирилл Анатольевич; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Севрюков, Олег Николаевич© 2021 Institute of Physics Publishing. All rights reserved.Amorphous alloys of the TiNi - TiCu system with a copper content of 25 to 40 at.% were prepared by planar flow casting at a melt cooling rate of 106 K/s. Crystallization of the alloys was carried out by isothermal annealing and by action of single electric pulse with a duration of 5 ms. Shape memory behavior and structure of the alloys was investigated by means of bending tests and X-ray phase analysis. It was found that increasing the copper content to above 30 at.% considerably reduces the plasticity and shape memory effect of the alloys. However, abrupt decreasing the annealing duration significantly improves the shape memory performance due to prevention of the formation of brittle Ti-Cu phases in the alloys structure.
- ПубликацияТолько метаданныеLocal atomic and crystal structure of rapidly quenched TiNiCu shape memory alloys with high copper content(2021) Veligzhanin, A.; Sundeev, R.; Chernysheva, O.; Shelyakov, A.; Sitnikov, N.; Borodako, K.; Чернышева, Ольга Викторовна; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Бородако, Кирилл Анатольевич© 2020 Elsevier B.V.This study aims to reveal features of the local crystal structure and environment in the quasi-binary TiNi–TiCu alloys containing 25–40 at.% Cu, by X-ray diffraction and EXAFS spectroscopy. The alloys were produced in an amorphous state by the melt-spinning technique and then crystallised by isothermal and electropulsing treatment. It was shown that Ni local structure is more disordered in comparison with Cu local environment, which is closer to the conventional crystallographic structure. An increase in the Cu content resulted in the magnification of the disordering in the nearest local environment, around both the Ni and Cu atoms, consisting of Ti atoms. No noticeable effect of the annealing rate on the local structure was found.
- ПубликацияТолько метаданныеShape memory behavior of rapidly quenched high-copper tinicu alloys(2021) Shelyakov, A.; Sitnikov, N.; Khabibullina, I.; Borodako, K.; Sevryukov, O.; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Бородако, Кирилл Анатольевич; Севрюков, Олег Николаевич© 2021, Universidade do Porto - Faculdade de Engenharia. All rights reserved.Rapidly quenched quasibinary TiNi–TiCu system alloys with high copper contents (above 20 at.%) exhibit excellent shape memory effect and have considerably narrower hysteresis as compared with the TiNi binary alloy, this advantage being of special importance for cyclic load applications, e.g. for microelectromechanics (MEMS). The aim of this work is to study the effect of annealing parameters and copper content on the shape memory effect in TiNiCu alloys. Thin amorphous ribbons of TiNi-TiCu alloys with copper contents of 25 to 40 at.% were produced by planar flow casting at a melt cooling rate of about 106 K/s. The alloys were crystallized by isothermal annealing with variable duration and by exposing specimens to a short (10 ms) electric pulse. Increasing the copper content to above 30 at.% considerably reduces the plasticity and shape memory effect of the alloys. However, significant reduction of annealing duration greatly improves the shape memory performance due to prevention of the formation of brittle Ti-Cu phases in the alloys structure.
- ПубликацияТолько метаданныеEffect of Boric Acid on the Structure and Properties of Borosiloxanes(2021) Mashchenko, V. I.; Khabibullina, I. A.; Chausov, D. N.; Spiridonov, V. V.; Sitnikov, N. N.; Shelyakov, A. V.; Ситников, Николай Николаевич; Шеляков, Александр Васильевич© 2021, Pleiades Publishing, Ltd.Abstract: Borosiloxane materials obtained by mixing and thermostatting of hydroxyl-terminated polydimethylsiloxane and boric acid are studied. Samples synthesized at room temperature and at a temperature above 220°С are nontransparent rubberlike masses. Washing of boric acid yields single-phase transparent borosiloxanes demonstrating the rubberlike behavior. Studies are carried out using elemental analysis, dynamic light scattering, synchronous thermal analysis, and polarization optical microscopy. The viscoelastic properties of the samples are characterized by rheological methods and the ability of polymer ball-like samples to spread and rebound. It is shown that in initial states they contain boric acid microcrystalline inclusions that scatter visible light. An increase in the synthesis temperature and the presence of unreacted boric acid improve the elasticity of the materials and decrease their thermal stability. The content of boron in borosiloxane obtained at an increased temperature is an order of magnitude higher than that in borosiloxane synthesized at room temperature, whereas the radius of the effective hydrodynamic sphere is smaller by a factor of 5 than that in the high-temperature borosiloxane. The rheological properties of the tested samples are different. These materials show promise as components of multilayer self-healing and shock-absorbing composites and materials with controlled tackiness.
- 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 метаданныеEffect of Electric Pulse Treatment under Tensile Stress on the Properties of Rapidly Quenched Ti50Ni20Cu30 Alloy(2021) Shelyakov, A. V.; Sitnikov, N. N.; Zaletova, I. A.; Borodako, K. A.; Шеляков, Александр Васильевич; Ситников, Николай Николаевич; Бородако, Кирилл Анатольевич© 2021, Allerton Press, Inc.Abstract: Amorphous ribbons from a rapidly quenched alloy of the TiNi–TiCu quasi-binary system with copper content of 30 at % are crystallized via electric pulse treatment with variable durations of impact in the range of 1 to 100 ms at external tensile stress of up to 250 MPa. It is shown that the formed bimorph structure of columnar and coarse crystals is characterized by considerable differences when compared to a rapidly quenched alloy with 25 at % copper. An increase in tensile stress does not affect the phase composition or microstructure of the alloy, but it does lower the critical temperatures of martensitic transformation.