Variation in kinetics of martensitic transformation during partial thermal cycling of the TiNi alloy

Belyaev, Sergey; Resnina, Natalia; Sibirev, Alexey; Lomakin, Ivan

doi:10.1016/j.tca.2014.03.002

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…Hereafter in this paper it will be referred to as CDF. The temperature T 0 can be approximated by [50,51] where M s (martensite start temperature) is the temperature at which the transformation starts upon cooling and A f (austenite finish) the temperature at which the reverse transformation to austenite is finished upon heating. Literature values for M s and A f , determined from differential scanning calorimetry measurements of NiTi (see [52]…”

Section: Materials and Model Parametersmentioning

confidence: 99%

A new approach predicting the evolution of laminated nanostructures—martensite in NiTi as an example

Petersmann

Antretter

Waitz

et al. 2017

Modelling Simul. Mater. Sci. Eng.

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A model for laminated nanostructures, combining classical energy minimization with full-field finite element calculations in a computationally fully automated manner, is set up and used to quantitatively analyse the interaction of grains via self-accommodation of their transformation strains. The well established B2–B19’ martensitic phase transformation in nanocrystalline NiTi is treated as an exemplary case to demonstrate our new framework. A systematic search for an optimal energy minimizing transformation path is employed within a full-field model, including crystallographic transformation strains and fully anisotropic elastic constants, by using the Python scripting language. The microstructure is updated based on previous calculation results. The underlying incremental free energy minimization criterion naturally reproduces the transformation kinetics. The sequence of grains subjected to transformation as well as the selection of martensitic variants within the grains are obtained yielding the evolution of the total interface energy as well as the strain energy, dominating our approach.

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Section: Materials and Model Parametersmentioning

confidence: 99%

A new approach predicting the evolution of laminated nanostructures—martensite in NiTi as an example

Petersmann

Antretter

Waitz

et al. 2017

Modelling Simul. Mater. Sci. Eng.

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“…It is known that thermal cycling of a TiNi alloy causes an increase in the density of defects [8,9] and leads to a decrease in the characteristic temperatures of the phase transition and a change in the stages of transformations. The characteristic temperatures obtained from DSC curves (Figure 3) showed that starting from the 15 th thermal cycle in the temperature range of the incomplete martensitic transformation the material does not completely transform into the martensitic state, and the direct transition proceeds with the formation of the intermediate martensitic R-phase.…”

mentioning

confidence: 99%

“…However, further thermal cycling during 70 thermal cycles does not significantly affect the kinetics of martensitic transformations. In [9,10], the temperature increase in Ti -50 at.% Ni is found to influence on the defect structure and the parameters of martensitic transitions. The defect structure should change irreversibly at high temperatures, as is observed in conventional alloys.…”

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confidence: 99%

Thermokinetic EMF during a reverse phase transition in titanium nickelide as a way of information recording

Petrova-Burkina

Рубаник

2021

Vescì Akademìì navuk Belarusì. Seryâ fizika-tehničnyh navuk

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The external factors that inﬂuence on the thermokinetic EMF value in the Ti – 50 at.% Ni samples were determined. A method for setting thermokinetic EMF in certain sections of the TiNi wire was developed. The thermokinetic EMF value was measured directly using a digital millivoltmeter MNIPI V7-72. The sections of the Ti – 50 at.% Ni wire samples were subjected to tensile tests on a tensile machine IP 5158-5. On the basis of calorimetric studies, the kinetics of martensitic transformations was investigated. It was found that the direct phase transition affects the thermokinetic EMF value of the Ti – 50 at.% Ni during thermal cycling. Thermal cycling in the temperature range of the complete martensitic transformation causes the thermokinetic EMF value reduction by 0.16 mV by the 15th temperature cycle. The degradation of the thermokinetic EMF value by 0.04 mV took place during thermal cycling in the temperature range of the incomplete martensitic transformation by the 70th thermal cycle. The thermokinetic EMF value was restored to 0.22 mV with increasing temperature to 240 °С, as in the case of annealing at temperatures of 400÷800 °С. The thermokinetic EMF value is associated with a change in physical and mechanical properties of the alloy during thermal cycling. It is characterized by a change in stages of the phase transition and a shift of the characteristic temperatures. On the basis of the obtained experimental data, a method was proposed for a purposeful setting of extended TiNi wire sections with the thermokinetic EMF value from 0 to 0.6 mV, using different methods of inﬂuence on its value (thermal cycling, deformation, temperature change in heating zone). The proposed technical solution can be used as a method for information recording.

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Softening process during reverse martensitic transformation in TiNi shape memory alloy

Sibirev

Belyaev

Resnina

2016

Journal of Alloys and Compounds

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Variation in kinetics of martensitic transformation during partial thermal cycling of the TiNi alloy

Cited by 8 publications

References 25 publications

A new approach predicting the evolution of laminated nanostructures—martensite in NiTi as an example

A new approach predicting the evolution of laminated nanostructures—martensite in NiTi as an example

Thermokinetic EMF during a reverse phase transition in titanium nickelide as a way of information recording

Softening process during reverse martensitic transformation in TiNi shape memory alloy

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