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

0574352 - FZÚ 2024 RIV GB eng J - Journal Article
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
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA20-14114S; GA ČR(CZ) GA22-20181S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Research Infrastructure: CzechNanoLab II - 90251
Institutional support: RVO:68378271
Keywords : NiTi * martensitic transformation * shape memory alloys * crystal structure of martensite * transmission electron microscopy
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 9.4, year: 2022
Method of publishing: Limited access
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.
Permanent Link: https://hdl.handle.net/11104/0344690