Shape memory effect in nanosized Ti2NiCu alloy-based composites

Recently, Ti-Ni based intermetallic alloys with shape memory effect (SME) have attracted much attention as promising functional materials for the development of record small nanomechanical tools, such as nanotweezers, for 3D manipulation of the real nano-objects. The problem of the fundamental restrictions on the minimal size of the nanomechanical device with SME for manipulation is connected with size effects which are observed in small samples of Ti-Ni based intermetallic alloys with thermoplastic structural phase transition from austenitic high symmetrical phase to low symmetrical martensitic phase. In the present work, by combining density functional theory and molecular dynamics modelling, austenite has been shown to be more stable than martensite in nanometer-sized TiNi wafers. In this case, the temperature of the martensitic transition asymptotically decreases with a decrease in the plate thickness h, and the complete suppression of the phase transition occurs for a plate with a thickness of 2 nm, which is in qualitative agreement with the experimental data. Moreover, the theoretical values obtained indicate the potential for even greater minimization of nanomechanical devices based on SME in TiNi.

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“…In accordance with Reference [ 51 ], the relative deformation of the actuator

, where

is the deflection, h is the thickness of the TiNi layer. Here for samples prepared we have observed ε = 0.7% and λ = 200 nm.…”

Section: Resultsmentioning

confidence: 65%

Phase Transformation in TiNi Nano-Wafers for Nanomechanical Devices with Shape Memory Effect

et al. 2022

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“…The relative strain that the composite undergoes (~1%) is controlled by heating and the magnitude of strain is similar to that of the alloy in the bulk form. The preparation of Ti2NiCu/Pt composite microtweezers is done by FIB CVD (for more details see [21][22][23][24][25][26][27][28]). The main stages of FIB etching of nanotweezers from the Ti2NiCu ribbon witch amorphous layer are illustrated in Fig 3.…”

Section: Design Thermally-controlled Nanotweezersmentioning

confidence: 99%

Ti2NiCu based composite nanotweezers with a shape memory effect and its use for DNA bunches 3D manipulation

Орлов¹,

Frolov²,

Smolovich³

et al. 2019

AIP Conference Proceedings

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The DNA molecules were controllable deposited on graphene and thin graphite films and visualized using AFM. The mechanical micro-and nanotools, such as nanotweezers with shape memory effect controlled by heating were designed and tested. A technique for fabricating a structure with the inclusion of suspended DNA threads and manipulating those using composite nanotweezers with shape memory effect was suggested.

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“…При нагревании выше температуры A f фазового перехода мартенсит−аустенит происходит сокращение активного слоя актюатора из-за наличия в нем псевдопластической деформации растяжения, при этом длина упругого слоя не изменяется, что приводит к изгибу актюатора, т. е. к его срабатыванию. При охлаждении ниже температуры M f фазового перехода аустенит−мартенсит происходит распрямление актюатора за счет упругого слоя [16].…”

Section: образцы и методыunclassified

Высокоскоростной композитный микроактюатор на основе сплава Ti-=SUB=-2-=/SUB=-NiCu с эффектом памяти формы

Кучин¹,

Лега²,

Орлов³

et al. 2018

Физика Твердого Тела

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Samples of microactuators are made of a bimorph composite of Ti_2NiCu 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 Ti_2NiCu alloy, pseudoplastically prestretched, and an amorphous layer of the same alloy is used as an elastic layer. Typical sizes of the microactuator are 30 × 2 × 2 μm. The controlled amplitude of the displacement of the microactuator tip is approximately 1 μm. The response rate of the microactuator was investigated by scanning electron microscopy. Activation of the microactuator was achieved by heating when electric pulses were passed through it. Full activation of the microactuator at frequencies up to 1 kHz was demonstrated; partial activation was observed at frequencies up to 8 kHz. The possibility of operating the device in a self-oscillating mode at frequencies of the order of 100 kHz is demonstrated.

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Shape memory effect in nanosized Ti2NiCu alloy-based composites

Cited by 18 publications

References 12 publications

Phase Transformation in TiNi Nano-Wafers for Nanomechanical Devices with Shape Memory Effect

Phase Transformation in TiNi Nano-Wafers for Nanomechanical Devices with Shape Memory Effect

Ti2NiCu based composite nanotweezers with a shape memory effect and its use for DNA bunches 3D manipulation

Высокоскоростной композитный микроактюатор на основе сплава Ti-=SUB=-2-=/SUB=-NiCu с эффектом памяти формы

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