B2 ⇒ B19′ ⇒ B2.sup.T./sup. martensitic transformation as a mechanism of plastic deformation of NiTi

0520328 - FZÚ 2020 RIV CH eng J - Journal Article
Šittner, Petr - Heller, Luděk - Sedlák, Petr - Chen, Y. - Tyc, Ondřej - Molnárová, Orsolya - Kadeřávek, Lukáš - Seiner, Hanuš
B2 ⇒ B19′ ⇒ B2^T martensitic transformation as a mechanism of plastic deformation of NiTi.
Shape Memory and Superelasticity. Roč. 5, č. 4 (2019), s. 383-396. ISSN 2199-384X. E-ISSN 2199-3858
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR GC17-00393J; GA MŠMT(CZ) LM2015088; GA ČR GA18-03834S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271 ; RVO:61388998
Keywords : materials * stress-induced martensitic transformation * superelasticity * twinning
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Condensed matter physics (including formerly solid state physics, supercond.) (UT-L)
Method of publishing: Limited access
https://doi.org/10.1007/s40830-019-00250-5

Deformation of superelastic NiTi wire with tailored microstructure was investigated in tensile loading–unloading tests up to the end of the stress plateau in wide temperature range from room temperature up to 200 °C. Lattice defects left in the microstructure of deformed wires were investigated by transmission electron microscopy. Tensile deformation is localized up to the highest test temperatures, even if practically no martensite phase exists in the wire at the end of the stress plateau. In tensile tests at elevated temperatures around 100 °C, at which the upper plateau stress approaches the yield stress for plastic deformation of martensite, upper plateau strains become unusually long, transformation strains become unrecoverable and deformation bands containing {114} austenite twins appear in the microstructure of deformed wires.
Permanent Link: http://hdl.handle.net/11104/0305015