NiTi shape memory alloy thin film sensor micro-array for detection of infrared radiation

Chan, P.M.; Chung, C.Y.; Ng, K.C.

doi:10.1016/j.jallcom.2006.01.119

Cited by 13 publications

(11 citation statements)

References 3 publications

(3 reference statements)

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“…However the general 3-D case calls for 12 martensite variants. 2-D simulation cells provide a framework for studying the martensitic phase transformation process (evolution and nucleation of different phases) in NiTi thin films, which finds many applications [68][69][70][71][72][73]. Furthermore, previous studies in this field report similar type of microstructure evolution [31,36].…”

Section: Figure-5mentioning

confidence: 97%

Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA

Gur

Frantziskonis

2016

Modelling Simul. Mater. Sci. Eng.

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Martensitic phase transformation in NiTi shape memory alloys (SMA) occurs over a hierarchy of spatial scales, as evidenced from observed multiscale patterns of the martensitic phase fraction, which depend on the material microstructure and on the size of the SMA specimen. This paper presents a methodology for the multiscale tracking of the thermally induced martensitic phase transformation process in NiTi SMA. Fine scale stochastic phase field simulations are coupled to macroscale experimental measurements through the compound wavelet matrix method (CWM). A novel process for obtaining CWM fine scale wavelet coefficients is used that enhances the effectiveness of the method in transferring uncertainties from fine to coarse scales, and also ensures the preservation of spatial correlations in the phase fraction pattern. Size effects, well-documented in the literature, play an important role in designing the multiscale tracking methodology. Molecular dynamics (MD) simulations are employed to verify the phase field simulations in terms of different statistical measures and to demonstrate size effects at the nanometer scale. The effects of thermally induced martensite phase fraction uncertainties on the constitutive response of NiTi SMA is demonstrated.

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Section: Figure-5mentioning

confidence: 97%

Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA

Gur

Frantziskonis

2016

Modelling Simul. Mater. Sci. Eng.

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“…The microstructure or morphology based unique behavior of NiTi at nano-or micrometer length scales makes it an attractive choice in the field of sensors, actuators, composites, or devices for medical and other applications [1,[5][6][7][40][41][42][43], where certain functionalities at certain length scales are required. Several studies address the surface and size effects at the atomic scale in the NiTi phase transformation process, attempting to provide more physics-based material models.…”

Section: Introductionmentioning

confidence: 99%

Atomistic Study on Size Effects in Thermally Induced Martensitic Phase Transformation of NiTi

Gur

Frantziskonis

2016

Smart Materials Research

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The atomistic study shows strong size effects in thermally induced martensitic phase transformation evolution kinetics of equiatomic NiTi shape memory alloys (SMAs). It is shown that size effects are closely related to the presence of free surfaces; thus, NiTi thin films and nanopillars are studied. Quasi-static molecular dynamics simulations for several cell sizes at various (constant) temperatures are performed by employing well-established interatomic potentials for NiTi. The study shows that size plays a crucial role in the evolution of martensite phase fraction and, importantly, can significantly change the phase transformation temperatures, which can be used for the design of NiTi based sensors, actuators, or devices at nano- to microscales. Interestingly, it is found that, at the nanometer scale, Richard’s equation describes very well the martensite phase fraction evolution in NiTi thin films and nanopillars as a function of temperature.

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“…Quite recently the successful use of the SMAs was demonstrated in micro-electro-mechanical systems (MEMS). The ability of the SME alloys to keep their unique characteristics at a micro-size level makes it possible to create on their base most miniature actuating devices: microgrippers, microswitches, microvalves, micropumps, microsensors [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In these units the actuators with reversible SME, manufactured entirely of SMAs as well as of composites based on SMAs, can be used.…”

Section: Introductionmentioning

confidence: 99%

Development of Micromechanical Device on the Base of Two-Way Shape Memory Alloy Ribbon

et al. 2018

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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 were capable of executing reversible bending deformations in a heating/cooling cycle. A series of microtweezers with the gap adjustable in the range from 5 to 120 µm was fabricated. The width of the gripping parts composed was 400-500 µm and their length was from 650 to 1300 µm depending on the gap value. Optical and scanning electron microscopes were used to monitor the operation of the tweezers. It has been revealed that the response speed of the microgrippers essentially depends on the control temperature mode. The optimum control parameters provide the response time about 1 s by the operation both in the environment and in vacuum. The complete process of manipulating (gripping-holding-moving-releasing) the carbon fibers at the diameter 10 to 20 µm with using the fabricated device was demonstrated.

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NiTi shape memory alloy thin film sensor micro-array for detection of infrared radiation

Cited by 13 publications

References 3 publications

Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA

Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA

Atomistic Study on Size Effects in Thermally Induced Martensitic Phase Transformation of NiTi

Development of Micromechanical Device on the Base of Two-Way Shape Memory Alloy Ribbon

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