Plastic deformation of B19’ monoclinic martensite in NiTi shape memory alloys: HRTEM analysis of interfaces in martensite variant microstructures

0574353 - FZÚ 2024 RIV GB eng J - Journal Article
Molnárová, Orsolya - Klinger, Miloslav - Duchoň, Jan - Seiner, Hanuš - Šittner, Petr
Plastic deformation of B19’ monoclinic martensite in NiTi shape memory alloys: HRTEM analysis of interfaces in martensite variant microstructures.
Acta Materialia. Roč. 258, Oct (2023), č. článku 119242. ISSN 1359-6454. E-ISSN 1873-2453
R&D Projects: GA ČR(CZ) GA20-14114S; GA ČR(CZ) GA22-20181S; GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Research Infrastructure: CzechNanoLab - 90110; CzechNanoLab II - 90251
Institutional support: RVO:68378271 ; RVO:61388998
Keywords : NiTi shape memory alloy * B19′ martensite * mechanism of plastic deformation * HRTEM analysis of interfaces * martensite variant microstructure
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Condensed matter physics (including formerly solid state physics, supercond.) (UT-L)
Impact factor: 9.4, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.actamat.2023.119242

Martensite variant microstructures in grains of nanocrystalline NiTi shape memory wire deformed in tensile test at room temperature up to 15% strain were analyzed in transmission electron microscope (TEM) with the aim to reveal the mechanism of plastic deformation of B19’ monoclinic martensite which created these microstructures. The analysed microstructures consisted of parallel and/or wedge arranged deformation bands within the martensite matrix oriented in a common 010 low index zone. High resolution TEM (HRTEM) analysis of 35 interfaces within a single grain was performed. The observed interfaces were reasonably planar on mesoscale of individual grains but highly irregular on atomic scale. Majority of analysed interfaces displayed interface planes and lattice misorientations similar to (100), (20-1) and (10-1) martensite twins, but not exactly, many interfaces deviated from the exact twin planes and misorientations.
Permanent Link: https://hdl.handle.net/11104/0344691