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Publications (165)
Phase-mix, phase transformations and crystallographic texture of amorphous/nanostructure melt-spun ribbons of Ti2NiCu were studied using X-ray diffraction and nano-indentation. Their peak two-way shape-memory effect occurs when most of the austenite (cubic, B2) phase has converted to martensite (orthorhombic, B19), but before grain growth takes pla...
The study of the effect of electropulse treatment with a variable duration on the crystallization processes and the structure of a amorphous TiNiCu alloy with 25 at.% Cu in comparison with isothermal annealing and heating at a constant speed was carried out. The alloy was fabricated by rapid-quenching from the liquid state (melt spinning technique)...
Strain variation on holding under a constant stress was studied in the Ti 40,7 Hf 9,5 Ni 41,8 Cu 8 alloy. It was found, that on holding under stress, the isothermal strain rose up to saturation, which value depended on holding temperature and stress. It was found that the dependencies of the isothermal strain on the holding temperature and stress w...
The effect of a tensile stress during electric pulse heat treatment on crystal structure formation in amorphous rapidly hardened Ti50Ni25Cu25 alloys is studied. Amorphous ribbons are subjected to a 10-msec electric pulse treatment in a free condition and under a tensile stress of 5.9 and 29.7 MPa. Specimen structure is studied by optical and scanni...
The efficiency of shape memory alloys for the MEMS technology has been recently demonstrated. Quasibinary intermetallic TiNi-TiCu alloys produced by rapid quenching from liquid phase in the form of thin (about 40 um) ribbons are an attractive material for the fabrication of micro-actuators due to their narrow temperature hysteresis of the shape mem...
Thin materials exhibiting the shape memory effect, with a narrow temperature hysteresis, are required to create miniature and high-speed devices. Quasi-binary intermetallic TiNi-TiCu alloys with high copper contents (more than 10 at %) demonstrate the reversible martensitic transformation with a small (4-6 K) hysteresis. Alloys of the TiNi–TiCu sys...
The work is devoted to the study of processes of structural changes leading to the realization of the two-way shape memory effect (TWSME) in the rapid quenched amorphous-crystalline alloy Ti 50 Ni 25 Cu 25 . The object of the study was a rapid quenched laminated amorphous-crystalline Ti 50 Ni 25 Cu 25 alloy ribbon with a thickness of about 39 um an...
The rapidly quenched alloys of the quasibinary intermetallic TiNi-TiCu system with a high copper content (more than 25 at.%) are of great interest as shape memory materials due to the possibility of a significant decrease in the temperature and deformation hysteresis in comparison with the binary TiNi alloy. To obtain alloys with a copper content o...
The aim of the present work is to study the influence of the vibration temperature, frequency and amplitude on the structure of amorphous NiTi-based shape memory alloys. The Ti40.7Hf9.5Ni44.8Cu5, Ti40.7Hf9.5Ni41.8Cu8 and Ti50Ni25Cu25 melt-spun amorphous thin ribbons were subjected to low-frequency mechanical vibrations in a Dynamical Mechanical Ana...
The room-temperature high-pressure torsion (HPT) behavior of a natural layered amorphous-crystalline composite with the precursor phases of the same chemical composition, but differing in structure has been studied by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and the measurements of indentati...
The influence of the low-frequency vibrations at room temperature on the structure of an amorphous Ti40.7Hf9.5Ni41.8Cu8 thin ribbon was studied by X-ray diffraction and high-resolution transmission electron microscopy. It was found that mechanical vibrations for 1 h led to the formation of crystalline clusters that were several nanometres in size....
This work is devoted to the study of the influence of electric pulse heat treatment of rapid-quenched Ti 50 Ni 25 Cu 25 alloy ribbons (at. %) with a surface crystal layer. The object of the study was a rapid-quenched layered amorphous-crystal ribbon with a thickness of about 30 µm and a width of about 1.5 mm, in which a thin surface crystal layer (...
The work deals with application of laser radiation for creation of metamaterial – layered structural composite based on rapidly quenched TiNiCu thin ribbon. Structural properties of the composite were examined by transmission and scanning electron microscopy. Considerable two-way shape memory effect was achieved and studied.
Recent progress in the development of the new functional materials opens up exciting possibilities for designing reconfigurable micro- and nano-structures and for operating mechanical nanotools which are controlled by external fields or heat. The nanotools such as nanotweezers with an active layer thickness of about several tenths of nm, and whose...
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...
The 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...
The influence of neutron irradiation on the amorphous Ti 40.7 Hf 9.5 Ni 44.8 Cu 5 and Ti 50 Ni 25 Cu 25 thin ribbons, their crystallization behaviour and martensitic transformations that occur after crystallization have been studied. The critical fluence value of 1⋅10 ¹⁹ cm ⁻² was found. If the fluence was 1⋅10 ¹⁹ cm ⁻² or less, the crystallization...
Using an original approach, a pronounced two-way shape memory effect is created for the first time in rapidly quenched alloys of the quasibinary TiNi–TiCu system with copper contents of up to 38 at %. The technique includes the combined effect of the dynamic crystallization of the amorphous state by application of a single pulse of electric current...
Amorphous TiNiCu alloys with copper contents of 28 to 38 at % are fabricated via melt spinning. The isothermal crystallization of alloys is conducted at 500°C with variable durations of the heat treatment (100 to 300 s). It is shown that shortening the duration of crystallization prevents the formation of brittle phases of the Ti–Cu system and cont...
The aim of the present work is to fabricate and to research microgrippers (microtweezers) on the basis of the two-way shape memory effect. Ti50Ni25Cu25 alloy (at.%) produced by melt-spinning technique in the form of layered amorphous-crystalline ribbons at around 40 µm of thickness was used as the base material. The obtained structural composites w...
The pulse response of the actuator based on rapidly quenched Ti2NiCu alloy with a thermoelastic martensitic transformation and the shape memory effect is studied experimentally. The mechanical response of the actuator cooled by running water is preserved when the duration of the excitation (activating) electric pulses decreases to 2 ms. High-speed...
Samples of microactuators are made of a bimorph composite of Ti2NiCu alloy with a thermoelastic martensitic transition and the shape memory effect, and their response rate is investigated. The active layer of the composite actuator is a layer of the rapidly quenched Ti2NiCu alloy, pseudoplastically prestretched, and an amorphous layer of the same a...
Thin ribbons 30–50 μm thick of the Ti50Ni50–xCux
(x = 25, 26, 28, 30, 32, 34; 36, 38 at %) alloys are produced by the melt-spinning technique at a cooling rate of approximately 106 K/s. It is revealed that at the content of copper 25 and 26 at % the alloys are in the amorphous-crystalline state, while at the content of copper above 26 at % the allo...
The peculiarities of pulsed laser ablation of MoSe2 targets which caused the formation of a complex plume containing atoms (Mo and Se) and Mo nanoparticles (Mo-NPs) have been studied. Investigations of the composition, structure, and catalytic activity toward the hydrogen evolution reaction (HER) for MoSex/Mo-NPs films prepared by pulsed laser depo...
Miniaturization is the central theme in modern fabrication technology. Many of the components used in modern products are becoming smaller and smaller. Here it is reported about the frontier nano-assembling and nano-investigations using new practical 3-D nanomanipulation system based on advanced high precision piezoelectric resonance motors, and th...
The properties of nanorods made of high-energy-gap Znx Mg1 – xO semiconductors are experimentally investigated using the new system of 3D manipulation of individual nanospecimens. The technology used to prepare Znx Mg1 – xO nanorods via gas-phase deposition on a substrate, the process whereby individual nanorods are selected by means of nanocomposi...
The paper presents the development of microtweezers on the basis of a shape memory TiNiCu alloy produced by melt-spinning technique in the form of amorphous-crystalline ribbon at around 40 μm of thickness. The ribbon is capable of executing reversible bending deformations in a heating/cooling cycle. Two elements of 400 μm wide were prepared from th...
The ribbons of the Ti50Ni50-xCux (x=25; 26; 28; 30; 34; 36; 38 at.%) alloy were produced by the melt-spinning technique at a cooling rate of approximately 10⁶ °C/s. The samples were characterized by means of scanning electron microscopy, X-ray diffraction, differential scanning calorimetry. It has been revealed that at the content of copper 25-26 a...
The elastocaloric effect (ECE) in fast-quenched Ti2NiCu ribbon under the periodic action of tensile force is studied experimentally. The ECE is measured as a function of relative elongation and the frequency of cycles in the range of 0.2 to 4 Hz. The maximum measured ECE in the alloy is 9.4 K under a mechanical load of 300 MPa at a relative deforma...
The structural and thermomechanical properties of rapidly quenched layered amorphous–crystalline Ti50Ni25Cu25 composite materials with various ratios of amorphous and crystalline phases are studied. These layered composite materials are shown to exhibit the two-way shape memory effect accompanied by bending deformation without additional thermomech...
We report the preparation of MoSx thin films with reactive pulsed laser deposition (RPLD), an original technique that allows us to investigate the correlation between key MoSx properties, such as the composition, morphology, and local structure, and the catalytic performance in the hydrogen evolution reaction (HER). The use of two geometries of nor...
New promising functional materials—amorphous-crystalline fast-quenched Ti2NiCu alloys exhibiting the shape memory effect (SME)—are studied. A method for annealing amorphous alloys by electric current pulses is proposed. This method allows one to obtain the needed degree of crystallinity. It is demonstrated that a microcrystalline structure with sph...
The amorphous Ti40.7Hf9.5Ni44.8Cu5 melt-span ribbon samples were subjected to low-frequency vibrations (20 Hz) with an amplitude of 1 or 4 μm at room temperature to study the influence of the vibrations on the structural relaxation and the crystallization of amorphous alloy. The results obtained showed that the samples retained the amorphous struct...
Composite materials based on Ti2NiCu alloy, exhibiting shape memory effect (SME), have the unique capability of temperature-controlled reversible actuation on micro- and nanoscale. Three approaches to realizing this objective are demonstrated. The first one involves creating an amorphous-crystalline composite by passing accurately controlled electr...
The shape memory effect (SME) in alloys with a thermoelastic martensite transition opens unique opportunities for the creation of miniature mechanical devices. The SME has been studied in layered composite microstructures consisting of a Ti2NiCu alloy and platinum. It occurs upon a decrease in the active layer thickness at least to 80 nm. Some phys...
The new concept of nanotweezers based on bimetallic composite Ti50Ni25Cu25/Pt with shape memory effect have recently demonstrated the ability to manipulate real nanoobjects, such as CNTs, graphene layers, etc., when heated to 40-60 °C by laser radiation. We demonstrate possibility of manipulation of microbiological objects – fibers from the body of...
The work deals with the study of the influence of combined action of thermomechanical and laser treatments of rapidly quenched TiNiCu thin ribbons on the properties of two-way shape memory effect. It was shown that increasing of the energy density of the laser radiation and the external mechanical stress leads to growth of the reversible strain of...
An in situ transmission electron microscopy study of the B2 ↔ B19′ martensitic transformation in Ti40.7Hf9.5Ni44.8Cu5 shape memory alloy was carried out. It was observed that the sequence of the martensite crystals shrinking on heating differed from the sequence of the martensite crystal appearance on previous cooling. This was shown that strain na...
A device for gripping of microand nanoobjects (nanotweezers) with a working body made of bimetal composite (fast-quenched Ti2NiCu alloy with shape memory and platinum layer) is developed and studied. A method for manufacturing of the composite material using local ion etching and ion-stimulated deposition from gas phase is proposed. A structure of...
The introduction of molybdenum nanoparticles in MoSex
thin films formed by pulsed laser deposition led to changes in the film structure. The base planes of the layered atomic packing of the MoSeх
matrix around Mo nanoparticles rotated; as a consequence, the edge sites that formed during the “breaking” of the Se–Mo–Se layered atomic packing came out...
Morphological and fractographic features of change of FeCo-based amorphous alloy surfaces after laser treatment are studied in detail. Regimes of laser treatment that allow various degrees of crystallization of the examined alloys to be obtained, including thin (<1 ∙m) crystal layers on amorphous alloy surfaces, amorphous-crystalline composites, an...
The work deals with the research of the effect of pulsed laser radiation (λ=248nm) on the structure and the manifestation of the shape memory effects (SMEs) in the Ti50Ni25Cu25 alloy, produced by melt spinning technique. It has been revealed that the proposed method of laser treatment leads to the formation of structural amorphous-crystalline compo...
The effect of pulsed laser radiation (λ = 248 nm, τ = 20 ns) on structural properties and shape memory behavior of the rapidly quenched Ti50Ni25Cu25 alloy ribbon was studied. The radiation energy density was varied from 2 to 20 mJ mm-2. The samples were characterized by means of scanning electron microscopy, x-ray diffraction, microhardness measure...
It has recently been proved that, in alloys, e.g., based on the Ti–Ni system, a shape memory effect (SME) is preserved down to the nanoscale sizes of an active alloy layer and demonstrated ultrasmall-sized and fully functional microand nanomechanical devices: actuators and nanotweezers that are fabricated via standard microelectronic technologies r...
Recently, new technology in 3D-nanomanipulation has been proposed based on the properties of Ni based functional alloys that exhibit thermoelastic martensitic transition and shape memory effects (SME) at micro and sub-micrometer dimensions. This report gives a survey of the current state of nano-manipulation and concludes that this new system can b...
The amorphous melt-spun (MS) Ti50Ni25Cu25 alloy is subjected to high-pressure torsion (HPT) at temperatures of 20-150 °C. The bright-field (BF) TEM images of the alloy change as a result of HPT processing, the view of the bright-field image depends on the temperature of HPT processing. HPT processing leads to a decrease in the energy of structural...
Thin ribbons of Ti50Ni25Cu25 (at %) alloy are produced by melt spinning in the amorphous, amorphous–crystalline, and crystalline states, depending on the melt cooling rate. It is shown that laminated amorphous–crystalline composite displays two-way shape memory behavior in bending with no additional thermomechanical treatment. It is established tha...
Isothermal martensitic transformation from cubic B2 phase to monoclinic B19' phase is observed by calorimetric measurement at a constant temperature that is higher than the start temperature of the forward martensitic transformation found during continuous cooling. The dependences of the alloy volume undergone the forward transformation under isoth...
Pre-martensitic phenomena such as abnormal resistivity growth, diffusion scattering, "tweed" contrast and internal friction peak were observed in Ti40.7Hf9.5Ni44.8Cu5 alloy prior to the forward martensitic transformation on cooling. It was shown that all the observed phenomena were due to the formation of quasi-static strain nanodomains in the B2 p...
div class="title">Manipulations of Submicro-fibers of Culex Pipiens with the Help of Nano-tweezers with Shape Memory Effect into Vacuum Chamber of FIB
- Volume 21 Issue S3 - Alexander Kamantsev, Alexey Mashirov, Pavel Mazaev, Victor Koledov, Vladimir Shavrov, Vladimir Dikan, Artemy Irzhak, Alexander Shelyakov
The pseudoelasticity effect was studied in amorphous–crystalline Ti40.7Hf9.5Ni44.8Cu5 shape-memory alloy with different volume fractions of the crystalline phase. Pseudoelastic behaviour was found in the samples with a volume fraction of the crystalline phase of 60% and above. An increase in the volume fraction of the crystalline phase led to a ris...
The two-way shape memory effect (TWSME) has been studied in an amorphous–crystalline thin ribbon of Ti40.7Hf9.5Ni44.8Cu5 shape memory alloy with different volume fractions of the crystalline phase. It is found that an increase in the volume fraction of the crystalline phase results in a non-monotonic variation in the value of the TWSME. A maximum s...
The paper deals with the development of a structural composite material exhibiting two-way shape memory effect. A Ti-Ni-Cu alloy was produced by the melt spinning technique at different cooling rates in the form of a ribbon with a thickness of approximately 40 μm. Layered amorphous-crystalline structure of the ribbon was obtained by varying the all...
Structural transformations in melt-spun Ti2NiCu ribbon are studied by means of X-ray diffraction. The phase composition of a ribbon during crystallization and martensitic transformations is determined
qualitatively and quantitatively. Temperatures of crystallization and the onset and finish of forward and
reverse martensitic transformations are est...
A fiber-optic thermosensor using thin shape memory ribbons of rapidly quenched TiNiCu alloy as thermosensitive element is described. It is shown that the developed thermosensor is optically passive, resistant to corrosion and to radio and electromagnetic noise. Also it has a fast response (less than 1 sec), a high reliability and durability (more t...
the paper reported about new practical system for 3D three dimensional (3D) nano-manipulation. The system consists of advanced high precision nano-manipulators based on piezoelectric resonance motors and end-effectors. The end-effector is the bimetallic composite nanotweezers based on Ti 2 NiCu alloy with shape memory effect. This nano-tweezer is e...
Samples of Ti2NiCu rapidly-quenched alloy with different fractions of crystalline phase were prepared from as-spun amorphous ribbons by two different techniques: applying electric pulse and annealing in differential scanning calorimeter (DSC). The structure and thermomechanical properties of these samples were studied. Spherulites were found in a s...
Phase-mix, phase transformations and crystallographic texture of amorphous/nanostructure melt-spun ribbons of Ti2NiCu were studied using X-ray diffraction and nano-indentation. Their peak two-way shape-memory effect occurs when most of the austenite (cubic, B2) phase has converted to martensite (orthorhombic, B19), but before grain growth takes pla...
The crystallization processes that occur during heating of hydrogen-containing melt-quenched alloys based on the quasi-binary TiNi-TiCu system alloyed with aluminum, iron, hafnium, and zirconium are studied by high-resolution differential scanning calorimetry. The general laws of the transition of the hydrogen-containing alloys from an amorphous in...
A special method for production of amorphous-crystalline TiNi-based thin ribbons were developed on the base of partial isothermal crystallization. It allowed one to prepare TiNi-based (Ti50Ni25Cu25, Ti40.7Hf9.5Ni44.8Cu5 and Ti40.7Hf9.5Ni39.8Cu10) samples with different volume fraction of crystalline phase from 0 to 100 %. It was observed that cryst...
The features of long-range crystal structure and local environment of Ni
and Cu atoms in shape memory alloy
Ti50Ni25Cu25 are investigated using
X-ray diffraction and extended X-ray absorption fine structure
spectroscopy (EXAFS) in the temperature range of direct and reverse
martensitic transformations. According to XRD study, alloy has the B2
type...
Recently we reported on the development of a composite material exhibiting reversible shape memory effect. A Ti–25Ni–25Cu (at.%) alloy was obtained by the melt spinning technique as amorphous–crystalline ribbons with a thickness of approximately 40 μm. The thickness of the amorphous and crystalline layers (dа and dc, respectively) was varied by ele...
The electronic energy structure of Ti-Ni and TiNi-Cu alloys has been studied experimentally by XPS and NEXAFS and theoretically by the full-potential local-orbital minimum-basis code. The study has revealed formation in the valence band of the Ti50Ni50 alloy of a common d-band through hybridization of the d-states of Ti with those of Ni, which is l...
The paper reports on a study of the electronic structure of binary homogeneous alloys Ti55Ni45, Ti50Ni50, and Ti45Ni55 by X-ray photoelectron and near-edge X-ray absorption spectroscopies. The experimental data obtained were used to derive the occupied and unoccupied d-states density redistribution upon formation of the Ti–Ni alloys. The Ti and Ni...
This work gives experimental evidence of a promising method of thermal-to-electric energy conversion by coupling shape memory effect (SME) and direct piezoelectric effect (DPE) for harvesting quasi-static ambient temperature variations. Two original prototypes of thermal energy harvesters have been fabricated and tested experimentally. The first is...
The density of valence-band electronic states of Ti(NiCu) alloys with different crystal structures and elemental compositions has been studied by X-ray photoelectron spectroscopy. It has been established that the change in the crystal state initiated by a martensitic transformation or a transition from the amorphous state to the crystal state does...
An enhanced scheme for a functional bilayered composite material with shape memory effect has been successfully applied on the microscale to fabricate a thermally controlled microactuator. Fabrication of cantilever-type microactuators from melt spun ribbon of TiNiCu shape memory alloy included electro-chemical polishing followed by focused ion beam...
This study reports on the development of a composite material, amorphous–crystalline TiNiCu alloy ribbons , exhibiting reversible shape memory effect. A Ti–25Ni–25Cu (at.%) alloy was fabricated by the melt spinning technique at different cooling rates in the form of a ribbon with a thickness of approximately 40 m. The samples were characterized by...
This study reports on the development of a composite material, amorphous–crystalline TiNiCu alloy ribbons,
exhibiting reversible shape memory effect. A Ti–25Ni–25Cu (at.%) alloy was fabricated by the melt
spinning technique at different cooling rates in the form of a ribbon with a thickness of approximately
40 �m. The samples were characterized by...
The mechanical behavior and functional properties in amorphous-crystalline thin ribbons of Ti40.7Hf9.5Ni44.8Cu5 alloy with a different volume fraction (from 0 to 100%) of crystalline phase were studied. The results obtained showed that a fully amorphous sample was deformed elastically up to 6%. The existence of the crystalline phase in the sample r...
The chemical composition of the surface of TiNi-based alloys in the form of ribbons produced by rapid melt quenching in oxygen-containing
environment has been investigated. It is shown that titanium oxide is formed on the Ti50Ni25Cu25 alloy surface, while on the Ti39.2Ni24.8Cu25Hf11 alloy surface titanium and hafnium oxides are formed. Atomic-force...
The development of micromechanical devices (MEMS and NEMS) on the basis of nanostructured shape memory alloys is reported. A Ti50Ni25Cu25 (at. %) alloy fabricated by the melt spinning technique in the form of a ribbon with a thickness around 40 μm and a width about 1.5 mm was chosen as a starting material. Technological parameters were optimized to...
The present work deals with the investigation of the nanostructured shape memory alloys for the purpose of development of micromechanical devices. The Ti50Ni25Cu25 (at.%) alloy fabricated by the melt spinning technique in the form of a ribbon with a thickness around 40μm and a width about 1.5mm was chosen as a starting material. Technological param...
The extended X-ray absorption fine structure spectroscopy (EXAFS) was applied to investigate the local structure peculiarities of TiNi-based shape memory alloys Ti50Ni25Cu25 and Ti39.2Ni24.8Cu25Hf11. The phase composition of ternary alloy was examined with the additional X-ray diffraction. Our experimental results demonstrate that the most signific...
The features of the structure and chemical composition of composite bimetallic ribbons based on nickel produced by the melt
spinning technique were investigated via methods of transmission and scanning electron microscopy with the use of X-ray spectral
microanalysis. The possibility of production of amorphous and amorphous-nanocrystalline composite...
An enhanced scheme of a functional composite material has been proposed and tested in the model experiments. The composite consists of an element with shape memory effect (SME) in the form of ribbon, film or plate connected rigidly to an element of an elastic material. The novel feature in this scheme is that an SME element should be preliminary gi...
The controllable annealing of amorphous Ti2NiCu ribbons by a pulsed electric current was developed, and samples with different fractions of crystalline phase were obtained. The samples’ structure was studied using high-resolution electron microscopy. Annealing conditions allowing us to obtain an amorphous nanocrystalline structure with grain sizes...
