Thermally induced reorientation and plastic deformation of B19' monoclinic martensite in nanocrystalline NiTi wires

0570230 - FZÚ 2024 RIV GB eng J - Článek v odborném periodiku
Iaparova, Elizaveta - Heller, Luděk - Tyc, Ondřej - Šittner, Petr
Thermally induced reorientation and plastic deformation of B19' monoclinic martensite in nanocrystalline NiTi wires.
Acta Materialia. Roč. 242, Jan (2023), č. článku 118477. ISSN 1359-6454. E-ISSN 1873-2453
Grant CEP: GA ČR(CZ) GA20-14114S; GA ČR(CZ) GA22-20181S; GA MŠMT(CZ) EF18_053/0016627; GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Výzkumná infrastruktura: CzechNanoLab - 90110; CzechNanoLab II - 90251
Institucionální podpora: RVO:68378271
Klíčová slova: NiTi * shape memory alloys * martensitic transformation
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.2022.118477

Functional behavior of nanocrystalline NiTi shape memory wires having various austenitic microstructures was investigated by thermomechanical testing and TEM analysis of martensite microstructures in deformed wires. Three phenomena are reported and discussed in this work. First, martensitic NiTi wire heated under low applied stresses elongates several percent before it shortens during reverse martensitic transformation due to thermally induced martensite reorientation proceeding via motion of interfaces between (001) compound twin domains in the microstructure. Second, martensite stabilization by deformation is not caused by plastic deformation and lattice defects introduced by deformation but that it is due to change of martensite variant microstructures in polycrystal grains during the reorientation process. Finally, generation of unrecovered plastic strains and dislocation defects accompanies all martensitic transformation/reorientation/detwinning processes in NiTi.
Trvalý link: https://hdl.handle.net/11104/0341682