In situ observation of stress-induced martensitic transformation and plastic deformation in TiNi alloy

Jiang, Xiangping; Hida, Moritaka; Takemoto, Yoshito; Sakakibara, Akira; Yasuda, Hidehiro; Mori, Hirotarô

doi:10.1016/s0921-5093(97)00422-x

Cited by 28 publications

(16 citation statements)

References 3 publications

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“…How the dislocation slip activity upon cycling is related to the microstructure of NiTi wires [7]? Does the incremental slip occur during the forward or reverse transformations [14]? Does the slip occur in the austenite or in the martensite phase [14,28]?…”

Section: Introductionmentioning

confidence: 99%

Instability of cyclic superelastic deformation of NiTi investigated by synchrotron X-ray diffraction

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Instability of cyclic superelastic deformation of NiTi investigated by synchrotron X-ray diffraction

et al. 2015

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“…Studies (Perkins and Sponholz 1984;Humbeeck et al 1990;Humbeeck 1991;Stalmans et al 1991;Jiang et al 1997;Liu et al 1999) have shown that the RD results in the material because of two major factors: (a) irreversible plastic deformation in the austenite phase, and (b) stabilization of the martensite/austenite phase. The irreversible plastic deformation in the austenite phase is believed to be due to generation of defects/ dislocations in the microstructure during TMC (Perkins and Sponholz 1984;Stalmans et al 1991;Jiang et al 1997;Liu et al 1999;Rong et al 2001;Otsuka and Ren 2005). These defects/dislocations in turn are responsible for stabilization of certain volume fraction of martensite/austenite phase in the material that does not take part in transformation during TMC.…”

Section: Discussionmentioning

confidence: 99%

“…The ΔG nc is essentially the elastic and irreversible energies that are built up during martensitic transformation and generation of defects in the structure (Perkins 1975;Jiang et al 1997). The increase in the TTs observed (figures 12-13) during TMC in the martensite phase is due to increase in ΔG nc as a result of introduction of dislocations in the material (Stachowiak and McCormick 1988).…”

Section: Discussionmentioning

confidence: 99%

“…Studies (Perkin and Sponholz 1984;Stachowiak and McCormick 1988;Humbeeck 1991;Eggeler et al 2004;Saikrishna et al 2006;Ramaiah et al 2008;Bhaumik et al 2008) have shown that the functional properties of the SMA such as the transformation temperatures, transformation hysteresis, and strain response etc change continuously upon TMC. This unstable behaviour is attributed to the generation of defects in the microstructure during TMC (Perkin and Sponholz 1984;Stalmans et al 1991;Jiang et al 1997;Liu et al 1999;Bhagyaraj et al 2009). The response of the NiTi SMA upon TMC largely depends on the thermomechanical processing history and the stress-strain regime of TMC, and is directly related to the defects density in the material (Erbstoeszer et al 2000;Bhaumik et al 2008;Ramaiah et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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On stability of NiTi wire during thermo-mechanical cycling

et al. 2009

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The use of NiTi wire as thermal actuator involves repeated thermal cycling through the transformation range under a constant or fluctuating load. The stability of the material under such conditions has been a concern for the past many years. Experimental results show that for a given alloy composition, the repetitive functional behaviour of NiTi wire is largely dependent on the processing schedule/parameters and the stress-strain regime of thermo-mechanical cycling (TMC). Among the various processing parameters, retained cold work in the material and the shape memory annealing temperature/time have significant influence. It has been shown in the present study that for a stable functional behaviour, the material needs to be tailored through judicious selection of these parameters. Study also shows that, after processing, the material requires an additional stabilization treatment for ensuring minimal variation in the repetitive functional response upon TMC.

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“…Transformation bands, plastic deformation and the accumulation of remnant martensite during superelastic cycling have been investigated by numerous researchers using light microscopy [13,14]. One underlying deformation process is identified as the movement of dislocations that is investigated by in situ strain transmission electron microscopy (TEM) [15]. If high functional stability is required dislocation movement has to be hindered effectively without impeding the transformation [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of crystallographic compatibility and grain size on the functional fatigue of sputtered TiNiCuCo thin films

Chluba

Dankwort

et al. 2016

Phil. Trans. R. Soc. A.

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The positive influence of crystallographic compatibility on the thermal transformation stability has been already investigated extensively in the literature. However, its influence on the stability of the shape memory effect or superelasticity used in actual applications is still unresolved. In this investigation sputtered films of a highly compatible TiNiCuCo composition with a transformation matrix middle eigenvalue of 1±0.01 are exposed to thermal as well as to superelastic cycling. In agreement with previous results the thermal transformation of this alloy is with a temperature shift of less than 0.1 K for 40 cycles very stable; on the other hand, superelastic degradation behaviour was found to depend strongly on heat treatment parameters. To reveal the transformation dissimilarities between the differently heat-treated samples, the microstructure has been analysed by transmission electron microscopy, in situ stress polarization microscopy and synchrotron analysis. It is found that good crystallographic stability is not a sufficient criterion to avoid defect generation which guarantees high superelastic stability. For the investigated alloy, a small grain size was identified as the determining factor which increases the yield strength of the composition and decreases the functional degradation during superelastic cycling. This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

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In situ observation of stress-induced martensitic transformation and plastic deformation in TiNi alloy

Cited by 28 publications

References 3 publications

Instability of cyclic superelastic deformation of NiTi investigated by synchrotron X-ray diffraction

Instability of cyclic superelastic deformation of NiTi investigated by synchrotron X-ray diffraction

On stability of NiTi wire during thermo-mechanical cycling

Effect of crystallographic compatibility and grain size on the functional fatigue of sputtered TiNiCuCo thin films

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