Thermomechanical aspects of NiTi

Shaw, John A.; Kyriakides, Stelios

doi:10.1016/0022-5096(95)00024-d

Cited by 861 publications

(610 citation statements)

References 28 publications

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“…This was confirmed analytically in [13] for the case of low initial energy. The finite scale of phase layering also agrees with experimental results [32], [33].…”

Section: Introductionsupporting

confidence: 87%

“…Observe also that the end load drops during nucleation. This is a common characteristic of experimentally observed nucleation events [32]. However, the load drop is quite severe and the phase boundary, once formed, proceeds at almost zero load.…”

Section: The Case With Interfacial Energymentioning

confidence: 53%

“…Materials undergoing stress-induced martensitic phase transformations often form a variety of finely layered microstructures and exhibit hysteretic behavior, e.g., [9], [31], [32], [33].…”

Section: Introductionmentioning

confidence: 99%

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Hysteresis and Stick-Slip Motion of Phase Boundaries in Dynamic Models of Phase Transitions

Vainchtein

Rosakis

1999

J. Nonlinear Sci.

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Summary. We investigate hysteretic behavior in two dynamic models for solid-solid phase transitions. An elastic bar with a nonconvex double-well elastic energy density is subjected to time-dependent displacement boundary conditions. Both models include inertia and a viscous stress term that provides energy dissipation. The first model involves a strain-gradient term that models interfacial energy. In the second model this term is omitted. Numerical simulations combined with analytical results predict hysteretic behavior in the overall end-load versus end-displacement diagram for both models. The hysteresis is largely due to metastability and nucleation; it persists even for very slow loading when viscous dissipation is quite small. In the model with interfacial energy, phase interfaces move smoothly. When this term is omitted, hysteresis is much more pronounced. In addition, phase boundaries move in an irregular, stick-slip fashion. The corresponding load-elongation curve exhibits serrations, in qualitative agreement with certain experimental observations in shape-memory alloys.

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“…This was confirmed analytically in [13] for the case of low initial energy. The finite scale of phase layering also agrees with experimental results [32], [33].…”

Section: Introductionsupporting

confidence: 87%

Section: The Case With Interfacial Energymentioning

confidence: 53%

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Hysteresis and Stick-Slip Motion of Phase Boundaries in Dynamic Models of Phase Transitions

Vainchtein

Rosakis

1999

J. Nonlinear Sci.

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“…However, there are not many reports [2,3] of stress-induced martensite texture measurements using hard X-rays on superelastic NiTi tensile specimens upon uniaxial loading. Shaw and Kyriakides [4][5][6] demonstrated that the deformation causing the superelastic plateau in the stress-strain curve of flat tensile-test specimens is localized in Lüders-band-like transformation shear bands (TSB). The phase contents and lattice strains in the TSB have been imaged by synchrotron diffraction experiments [7].…”

Section: Introductionmentioning

confidence: 99%

Hard X-ray studies of stress-induced phase transformations of superelastic NiTi shape memory alloys under uniaxial load

Hasan

Schmahl

Hackl

et al. 2008

Materials Science and Engineering: A

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We examined the texture evolution in a superelastic Ni 50.7 Ti 49.3 (numbers indicate at.%) alloy under applied uniaxial stress using high-energy synchrotron X-ray diffraction in transmission geometry. Texture information is identified from the intensity variations along Debye-Scherrer rings recorded on area detector diffraction images. The 1 1 0 A austenite plane normals are aligned in the rolling direction and 2 0 0 A is in the transverse direction. Due to the B2-B19 lattice correspondence, the 1 1 0 A peak splits into four martensite peaks 0 2 0 M ,1 1 1 M , 0 0 2 M and 1 1 1 M . The stress-induced martensite is strongly textured from twin variant selection in the stress field with 0 2 0 M aligned in the loading direction while the maxima corresponding to1 1 1 M , 0 0 2 M and 1 1 1 M are at 60 • , 67 • and 75 • from the loading direction. (B19 unit cell setting: a = 2.87Å, b = 4.59Å, c = 4.1Å, ␥ = 96.2 • ). A comparison between the experimental and recalculated distribution densities for the polycrystalline NiTi shows a reasonable agreement. In addition, we compare our experimental results with a micromechanical model which is based on total energy minimization. In this case, we also observe an overall agreement.

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“…[12][13][14][15][16][17][18] The characteristic transformation temperatures for the austenite-to-martensite phase transformation as well as the mechanical response can be modified to meet application requirements through (i) thermo-mechanical processing, [19][20][21] (ii) slight variation from the equi-atomic NiTi chemical composition, [22,23] or (iii) addition of alloying elements. [24][25][26][27][28] This phase transformation generally involves an austenitic cubic B2 structure transforming to and from either a martensitic monoclinic B19 or orthorhombic B19¢ structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Qiu

Young

Nie

2015

Metall Mater Trans A

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Shape memory alloys (SMAs) exhibit high damping capacity in both austenitic and martensitic phases, due to either a stress-induced martensite phase transformation or a stress-induced martensite variant reorientation, making them ideal candidates for vibration suppression devices to protect structural components from damage due to external forces. In this study, both quasi-static and dynamic compression was conducted on a martensitic NiTi SMA using a mechanical loading frame and on a Kolsky compression bar, respectively, to examine the relationship between microstructure and phase transformation characteristics of martensitic NiTi SMAs. Both endothermic and exothermic peaks disappear completely after experiencing deformation at a strain rate of 10 3 s À1 and to a strain of about 10 pct. The phase transformation peaks reappear after the deformed specimens were annealed at 873 K (600°C) for 30 minutes. As compared to samples from quasi-static loading, where a large amount of twinning is observed with a small amount of grain distortion and fracture, samples from dynamic loading show much less twinning with a larger amount of grain distortion and fracture.

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Thermomechanical aspects of NiTi

Cited by 861 publications

References 28 publications

Hysteresis and Stick-Slip Motion of Phase Boundaries in Dynamic Models of Phase Transitions

Hysteresis and Stick-Slip Motion of Phase Boundaries in Dynamic Models of Phase Transitions

Hard X-ray studies of stress-induced phase transformations of superelastic NiTi shape memory alloys under uniaxial load

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

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