Beyond the strain recoverability of martensitic transformation in NiTi
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00504077" target="_blank" >RIV/61389005:_____/19:00504077 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/19:00517366 RIV/61388998:_____/19:00517366 RIV/68407700:21340/19:00337181
Result on the web
<a href="https://doi.org/10.1016/j.ijplas.2019.01.007" target="_blank" >https://doi.org/10.1016/j.ijplas.2019.01.007</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijplas.2019.01.007" target="_blank" >10.1016/j.ijplas.2019.01.007</a>
Alternative languages
Result language
angličtina
Original language name
Beyond the strain recoverability of martensitic transformation in NiTi
Original language description
Tensile deformation of a medical grade NiTi wire was investigated in a wide temperature range from -100 degrees C to 450 degrees C. Supplemental in-situ electrical resistance, synchrotron x-ray diffraction, digital image correlation and ex-situ TEM methods were employed to characterize deformation/transformation processes acting at high temperatures and stresses. Conventional superelastic deformation due to stress induced martensitic transformation taking place around room temperature becomes gradually accompanied by dislocation slip in the temperature range 30-80 degrees C. With further increasing temperature, stress induced martensitic transformation still proceeds in localized manner but the length of the forward stress plateau increases, volume fraction of the martensite phase at the end of forward stress plateau decreases, unrecovered strain increases and {114} austenite twins appeared in the microstructure of deformed wires. These observations were explained by the activity of a new deformation mechanism - stress induced B2 = > B19' = > B2(T) martensitic transformation into twinned austenite coupled with dislocation slip. Thermodynamic and crystallographic aspects of this B2 = > B19' = > B2(T) martensitic transformation breaking the strain recoverability limit of cubic to monoclinic martensitic transformation were outlined. To rationalize the observed thermomechanical responses of the wire at elevated temperatures, a TRIP like deformation mechanism based on this transformation was incorporated into an existing constitutive model of thermomechanical behaviors of NiTi. The model was numerically implemented into finite element code, simulations were performed and compared with the experimentally observed behaviors.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Plasticity
ISSN
0749-6419
e-ISSN
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Volume of the periodical
116
Issue of the periodical within the volume
5
Country of publishing house
GB - UNITED KINGDOM
Number of pages
33
Pages from-to
232-264
UT code for WoS article
000463303400013
EID of the result in the Scopus database
2-s2.0-85062169868