Beyond the strain recoverability of martensitic transformation in NiTi

0517366 - FZÚ 2020 RIV GB eng J - Článek v odborném periodiku
Heller, Luděk - Šittner, Petr - Sedlák, Petr - Seiner, Hanuš - Tyc, Ondřej - Kadeřávek, Lukáš - Sedmák, P. - Vronka, Marek
Beyond the strain recoverability of martensitic transformation in NiTi.
International Journal of Plasticity. Roč. 116, May (2019), s. 232-264. ISSN 0749-6419. E-ISSN 1879-2154
Grant CEP: GA ČR GA16-20264S; GA ČR GA18-03834S; GA MŠMT(CZ) LM2015088; GA MŠMT LM2015087
Institucionální podpora: RVO:68378271 ; RVO:61388998
Klíčová slova: shape-memory alloys * plastic-deformation * NiTi * mechanics modelling * TRIP * tensile testing
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.); Materials engineering (UT-L)
Impakt faktor: 6.490, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.ijplas.2019.01.007

Tensile deformation of a medical grade NiTi wire was investigated in a wide temperature range from −100 °C to 450 °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 °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.
Trvalý link: http://hdl.handle.net/11104/0302698