On the plastic deformation accompanying cyclic martensitic transformation in thermomechanically loaded NiTi

Heller, Luděk; Seiner, Hanuš; Šittner, Petr; Sedlák, Petr; Tyc, Ondřej; Kadeřávek, Lukáš

doi:10.1016/j.ijplas.2018.07.007

Cited by 89 publications

(40 citation statements)

References 32 publications

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“…This proposition does not disregard the role of dislocation slip in cyclic instability, as articulated in Ref. [4].…”

Section: Instability Of Cyclic Superelastic Deformationmentioning

confidence: 97%

“…10d). After the 5th cycle, the observed density of dislocations became considerably higher and even isolated {114} austenite twins were occasionally found (see [4,7,8] for identification and analysis of the {114} austenite twins in deformed microstructures). After the 20th cycle, when the accumulated unrecovered strain approached nearly 7%, {114} austenite twins became common defects in the microstructure of cyclically deformed 16 ms wire.…”

Section: Cyclic Superelastic Testsmentioning

confidence: 99%

“…9a-f, 13a-d). We have recently rationalized these small unrecovered strains and dislocation defects created upon superelastic cycling by incremental dislocation slip taking place during the forward as well as during the reverse martensitic transformation [4]. It was revealed that the unrecovered strain is generated only if the transformation proceeds under external stress and that its magnitude increases with increasing temperature and stress at which the transformation proceeds.…”

Section: Instability Of Cyclic Superelastic Deformationmentioning

confidence: 99%

“…Since that time, they have been spreading into other engineering areas such as e.g., seismic protection in civil engineering, actuation in robotics, or wide range of novel applications in automotive and aerospace sectors [2]. The wires show excellent superelasticity at body temperature 37°C [1,[3][4][5][6] for which they were developed but this does not warrant same performance at different temperatures. Once the test temperature exceeds 50°C [4], the cyclic superelastic stressstrain responses of the commercially available superelastic NiTi wires gradually change and become unstable.…”

Section: Introductionmentioning

confidence: 99%

“…However, the superelastic NiTi wires exhibit instability of cyclic stress-strain response and related functional and structural fatigue, which represents serious problems for many promising engineering applications. It was linked to the transformation-plasticity coupling in the literature [3][4][5][6][7][8][9][10][11]. In this respect, tensile tests until rupture on NiTi wires have become of interest again.…”

Section: Introductionmentioning

confidence: 99%

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Tensile Deformation of Superelastic NiTi Wires in Wide Temperature and Microstructure Ranges

Chen

Tyc

Molnárová

et al. 2018

Shap. Mem. Superelasticity

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Superelastic NiTi wires were prepared from a single cold worked wire by various electropulse heat treatments. The wires having a wide range of virgin microstructures were subjected to tensile tests until rupture and cyclic superelastic tensile testing in a wide temperature range. The results were complemented by TEM observation of lattice defects created by superelastic cycling. It appeared that the yield stress depends significantly on the wire microstructure and less on the test temperature. The upper plateau stress varies with the microstructure through its effect on the Ms temperature and increases with increasing temperature in accord with the Clausius-Clapeyron equation up to a maximum temperature characteristic for each microstructure. The upper plateau strains exhibit pronounced maxima (12-18%) at test temperatures and microstructures (pulse times), at which the upper plateau stress approaches the yield stress. The instability of cyclic superelastic deformation was found to be inversely related to the difference between the yield stress and upper plateau stress. Cyclic deformation introduces dislocation slip in the microstructure of the cycled wire from the 3rd cycle and promotes formation of {114} austenite twins upon later cycling. These observations were explained by the activation of deformation twinning in oriented martensite and the stress induced B2 ) B19 0 ) B2 T martensitic transformation in specific range of microstructures and temperatures. The ductility of the tested wires was observed to vary stepwise with microstructure from * 13 up to * 55% and gradually decreased with temperature increasing above 100°C.

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“…This proposition does not disregard the role of dislocation slip in cyclic instability, as articulated in Ref. [4].…”

Section: Instability Of Cyclic Superelastic Deformationmentioning

confidence: 97%

Section: Cyclic Superelastic Testsmentioning

confidence: 99%

Section: Instability Of Cyclic Superelastic Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tensile Deformation of Superelastic NiTi Wires in Wide Temperature and Microstructure Ranges

Chen

Tyc

Molnárová

et al. 2018

Shap. Mem. Superelasticity

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A general thermodynamical model for finitely-strained continuum with inelasticity and diffusion, its GENERIC derivation in Eulerian formulation, and some application

Mielke,

Roubíček

2024

Z. Angew. Math. Phys.

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A thermodynamically consistent visco-elastodynamical model at finite strains is derived that also allows for inelasticity (like plasticity or creep), thermal coupling, and poroelasticity with diffusion. The theory is developed in the Eulerian framework and is shown to be consistent with the thermodynamic framework given by General Equation for Non-Equilibrium Reversible-Irreversible Coupling (GENERIC). For the latter we use that the transport terms are given in terms of Lie derivatives. Application is illustrated by two examples, namely volumetric phase transitions with dehydration in rocks and martensitic phase transitions in shape-memory alloys. A strategy toward a rigorous mathematical analysis is only very briefly outlined.

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Implementation of SMA wires in ultra-lightweight deployment/deflection mechanisms for aerospace and unmanned aerial vehicles

Zhang,

Chen,

Yang

et al. 2024

Acta Mech

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On the plastic deformation accompanying cyclic martensitic transformation in thermomechanically loaded NiTi

Cited by 89 publications

References 32 publications

Tensile Deformation of Superelastic NiTi Wires in Wide Temperature and Microstructure Ranges

Tensile Deformation of Superelastic NiTi Wires in Wide Temperature and Microstructure Ranges

A general thermodynamical model for finitely-strained continuum with inelasticity and diffusion, its GENERIC derivation in Eulerian formulation, and some application

Implementation of SMA wires in ultra-lightweight deployment/deflection mechanisms for aerospace and unmanned aerial vehicles

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