Degradation of two-way shape memory effect due to the relaxation of internal oriented stress in NiTi alloy on holding at 640÷700 K

Результат исследований: Научные публикации в периодических изданияхстатья

Выдержка

This work aims to study the two-way shape memory effect degradation due to stress relaxation during holding pre-deformed Ni-50.0 at.% Ti alloy at temperatures from a range of 640–700 K. To initiate the two-way shape memory effect, samples were subjected to 12% preliminary isothermal deformation by torsion in the martensitic state (at room temperature). The influence of holding at 640 or 700 K for 0–60 min on the recoverable strain variation on cooling and heating of the pre-deformed samples was studied. The main degradation of the two-way shape memory effect was found after holding the sample up to 60 min; however, full degradation was not observed, even after holding at 700 K for 6 h. A decrease in the two-way shape memory effect value was believed to be caused by relaxation in the oriented internal stress and it was assumed that this process might be described by a first-order differential equation. This equation was used to simulate the influence of holding duration on the recoverable strain variation and a good correlation between the simulated and experimental data was obtained. The activation energy of the internal stress relaxation during holding at 640 or 700 K was calculated and found to be 0.84 ± 0.01 eV, which was close to the energy of vacancy migration.
Язык оригиналаанглийский
Номер статьи103174
Число страниц5
ЖурналMechanics of Materials
Том138
Ранняя дата в режиме онлайн6 сен 2019
DOI
СостояниеОпубликовано - ноя 2019

Отпечаток

Shape memory effect
degradation
Degradation
Stress relaxation
Residual stresses
stress relaxation
residual stress
Torsional stress
Vacancies
Differential equations
Activation energy
Cooling
Heating
Temperature
torsion
differential equations
activation energy
cooling
heating
room temperature

Предметные области Scopus

  • Материаловедение (все)

Ключевые слова

  • эффект обратимой памяти формы, релаксация внутренних напряжений, NiTi

Цитировать

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title = "Degradation of two-way shape memory effect due to the relaxation of internal oriented stress in NiTi alloy on holding at 640÷700 K",
abstract = "This work aims to study the two-way shape memory effect degradation due to stress relaxation during holding pre-deformed Ni-50.0 at.{\%} Ti alloy at temperatures from a range of 640–700 K. To initiate the two-way shape memory effect, samples were subjected to 12{\%} preliminary isothermal deformation by torsion in the martensitic state (at room temperature). The influence of holding at 640 or 700 K for 0–60 min on the recoverable strain variation on cooling and heating of the pre-deformed samples was studied. The main degradation of the two-way shape memory effect was found after holding the sample up to 60 min; however, full degradation was not observed, even after holding at 700 K for 6 h. A decrease in the two-way shape memory effect value was believed to be caused by relaxation in the oriented internal stress and it was assumed that this process might be described by a first-order differential equation. This equation was used to simulate the influence of holding duration on the recoverable strain variation and a good correlation between the simulated and experimental data was obtained. The activation energy of the internal stress relaxation during holding at 640 or 700 K was calculated and found to be 0.84 ± 0.01 eV, which was close to the energy of vacancy migration.",
keywords = "эффект обратимой памяти формы, релаксация внутренних напряжений, NiTi",
author = "Irina Ponikarova and Sergey Belyaev and Natalia Resnina",
year = "2019",
month = "11",
doi = "https://doi.org/10.1016/j.mechmat.2019.103174",
language = "English",
volume = "138",
journal = "Mechanics of Materials",
issn = "0167-6636",
publisher = "Elsevier",

}

Degradation of two-way shape memory effect due to the relaxation of internal oriented stress in NiTi alloy on holding at 640÷700 K. / Ponikarova, Irina ; Belyaev, Sergey ; Resnina, Natalia .

В: Mechanics of Materials, Том 138, 103174, 11.2019.

Результат исследований: Научные публикации в периодических изданияхстатья

TY - JOUR

T1 - Degradation of two-way shape memory effect due to the relaxation of internal oriented stress in NiTi alloy on holding at 640÷700 K

AU - Ponikarova, Irina

AU - Belyaev, Sergey

AU - Resnina, Natalia

PY - 2019/11

Y1 - 2019/11

N2 - This work aims to study the two-way shape memory effect degradation due to stress relaxation during holding pre-deformed Ni-50.0 at.% Ti alloy at temperatures from a range of 640–700 K. To initiate the two-way shape memory effect, samples were subjected to 12% preliminary isothermal deformation by torsion in the martensitic state (at room temperature). The influence of holding at 640 or 700 K for 0–60 min on the recoverable strain variation on cooling and heating of the pre-deformed samples was studied. The main degradation of the two-way shape memory effect was found after holding the sample up to 60 min; however, full degradation was not observed, even after holding at 700 K for 6 h. A decrease in the two-way shape memory effect value was believed to be caused by relaxation in the oriented internal stress and it was assumed that this process might be described by a first-order differential equation. This equation was used to simulate the influence of holding duration on the recoverable strain variation and a good correlation between the simulated and experimental data was obtained. The activation energy of the internal stress relaxation during holding at 640 or 700 K was calculated and found to be 0.84 ± 0.01 eV, which was close to the energy of vacancy migration.

AB - This work aims to study the two-way shape memory effect degradation due to stress relaxation during holding pre-deformed Ni-50.0 at.% Ti alloy at temperatures from a range of 640–700 K. To initiate the two-way shape memory effect, samples were subjected to 12% preliminary isothermal deformation by torsion in the martensitic state (at room temperature). The influence of holding at 640 or 700 K for 0–60 min on the recoverable strain variation on cooling and heating of the pre-deformed samples was studied. The main degradation of the two-way shape memory effect was found after holding the sample up to 60 min; however, full degradation was not observed, even after holding at 700 K for 6 h. A decrease in the two-way shape memory effect value was believed to be caused by relaxation in the oriented internal stress and it was assumed that this process might be described by a first-order differential equation. This equation was used to simulate the influence of holding duration on the recoverable strain variation and a good correlation between the simulated and experimental data was obtained. The activation energy of the internal stress relaxation during holding at 640 or 700 K was calculated and found to be 0.84 ± 0.01 eV, which was close to the energy of vacancy migration.

KW - эффект обратимой памяти формы, релаксация внутренних напряжений, NiTi

UR - https://www.sciencedirect.com/science/article/pii/S0167663619302480

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M3 - Article

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JO - Mechanics of Materials

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