Modulated martensite in NiTi shape memory alloy exposed to high stress at high temperatures

0574352 - FZÚ 2024 RIV GB eng J - Článek v odborném periodiku
Chen, Yuchen - Klinger, Miloslav - Duchoň, Jan - Šittner, Petr
Modulated martensite in NiTi shape memory alloy exposed to high stress at high temperatures.
Acta Materialia. Roč. 258, Oct (2023), č. článku 119250. ISSN 1359-6454. E-ISSN 1873-2453
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA20-14114S; GA ČR(CZ) GA22-20181S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Výzkumná infrastruktura: CzechNanoLab II - 90251
Institucionální podpora: RVO:68378271
Klíčová slova: NiTi * martensitic transformation * shape memory alloys * crystal structure of martensite * transmission electron microscopy
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 9.4, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.actamat.2023.119250

NiTi shape memory wire was deformed in martensite state at low temperature −125 °C up to 750 MPa stress and subsequently heated far above the Af temperature while the stress 750 MPa was held constant. Under such conditions, the heated B19’ martensite in the wire was driven towards its thermomechanical stability limits and eventually transformed into plastically deformed austenite. In order to evaluate the mechanism by which such highly constrained reverse martensitic transformation proceeds, martensite variant microstructures and lattice defects evolving in the heated wire were analyzed by TEM and HRTEM.
Trvalý link: https://hdl.handle.net/11104/0344690