Recent developments in the research of shape memory alloys

Otsuka, Kazuhiro; Ren, Xiaobing

doi:10.1016/s0966-9795(98)00070-3

Cited by 788 publications

(409 citation statements)

References 78 publications

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“…. Different researchers [115][116][117][118] independently showed that the GBs and other similar defects are favorable places for martensitic nucleation. These conclusions have motivated us to put the multi-variant embryo at GBs.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Phase field modeling of the tetragonal-to-monoclinic phase transformation in zirconia

et al. 2013

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Zirconia based ceramics are strong, hard, inert, and smooth, with low thermal conductivity and good biocompatibility. Such properties made zirconia ceramics an ideal material for different applications form thermal barrier coatings (TBCs) to biomedicine applications like femoral implants and dental bridges. However, this unusual versatility of excellent properties would be mediated by the metastable tetragonal (or cubic) transformation to the stable monoclinic phase after a certain exposure at service temperatures. This transformation from tetragonal to monoclinic, known as LTD (low temperature degradation) in biomedical application, proceeds by propagation of martensite, which corresponds to transformation twinning. As such, tetragonal to monoclinic transformation is highly sensitive to mechanical and chemomechanical stresses. It is known in fact that this transformation is the source of the fracture toughening in stabilized zirconia as it occurs at the stress concentration regions ahead of the crack tip.This dissertation is an attempt to provide a kinetic-based model for tetragonal to monoclinic transformation in zirconia. We used the phase field technique to capture the temporal and spatial evolution of monoclinic phase. In addition to morphological patterns, we were able to calculate the developed internal stresses during tetragonal to monoclinic transformation. The model was started form the two dimensional single crystal then was expanded to the two dimensional polycrystalline and finally to the three dimensional single crystal. The model is able to predict the most physical properties associated with tetragonal to monoclinic transformation in zirconia including: morphological patterns, transformation toughening, shape memory effect, pseudoelasticity, surface uplift, and variants impingement. The model was benched marked with several experimental works. The good agreements between simulation results and experimental data, make the model a reliable tool for predicting tetragonal to monoclinic transformation in the cases we lack experimental observations.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Phase field modeling of the tetragonal-to-monoclinic phase transformation in zirconia

et al. 2013

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“…For Ni- [252,253] while Ni ?3 Ti is the equilibrium precipitate [2]. For Ti-rich NiTi appropriate heat treatments can originate Ti ?2 Ni [254].…”

Section: Post-weld Heat Treatmentsmentioning

confidence: 99%

Welding and Joining of NiTi Shape Memory Alloys: A Review

Oliveira

Miranda

Fernandes

2017

Progress in Materials Science

255

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“…Among all the shape memory alloys (SMAs), the near equiatomic TiNi alloy is one of the most used due to the their excellent properties like corrosion resistance, biocompatibility and its superior mechanical properties such as large deformation and recovery force 1,2 . In addition, TiNi thin films show shape memory effects comparable to those of bulk materials 2,3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Spun Velocities and Composition on the Microstructure and Transformation Temperatures of TiNi Shape Memory Ribbons

et al. 2016

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Ti-50.13Ni and Ti-49.62Ni (at.%) shape memory alloy ribbons were fabricated by melt-spinning method at different circumferential wheel velocities. The effects of wheel velocity, chemical composition and heat treatments on microstructure and Transformation temperature were investigated. Differences in wheel velocity led to differences in cooling rate and sample dimension, as well as in phase transformation temperatures. Two heat treatment conditions were studied, 350°C for 1h and 350°C for 5h. In the samples produced at high wheel velocity and heat-treated at 350°C for 5h, nanosized Ti-rich precipitates were observed in both chemical compositions. Cross-sectional microstructure was studied by optical microscopy; SEM was used to study the nanometric grains and nano precipitation. The transformation temperatures were analyzed by DSC.

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Recent developments in the research of shape memory alloys

Cited by 788 publications

References 78 publications

Phase field modeling of the tetragonal-to-monoclinic phase transformation in zirconia

Phase field modeling of the tetragonal-to-monoclinic phase transformation in zirconia

Welding and Joining of NiTi Shape Memory Alloys: A Review

Effect of Spun Velocities and Composition on the Microstructure and Transformation Temperatures of TiNi Shape Memory Ribbons

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