In-situ synchrotron X-ray diffraction texture analysis of tensile deformation of nanocrystalline NiTi wire in martensite state

0556273 - FZÚ 2023 RIV NL eng J - Journal Article
Bian, Xiaohui - Heller, Luděk - Kadeřávek, Lukáš - Šittner, Petr
In-situ synchrotron X-ray diffraction texture analysis of tensile deformation of nanocrystalline NiTi wire in martensite state.
Applied Materials Today. Roč. 26, Mar. (2022), č. článku 101378. ISSN 2352-9407. E-ISSN 2352-9407
R&D Projects: GA ČR(CZ) GA20-14114S; GA MŠMT LM2018110; GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA22-20181S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : NiTi shape memory alloy * martensitic deformation * synchrotron X-ray diffraction * in-situ texture analysis
OECD category: Materials engineering
Impact factor: 8.3, year: 2022
Method of publishing: Open access

Tensile deformation of nanocrystalline superelastic NiTi wire in the martensite state at -90 °C until fracture was investigated by in-situ synchrotron X-ray diffraction texture analysis. The results were interpreted in terms of various transformation and deformation twinning modes and using an abstraction of “ideal hkl fibre textured polycrystal” for estimating the martensite texture evolution. The four fibre texture of selfaccommodated martensite transforms during martensite reorientation into the sharp two fibre texture of reoriented martensite reflecting (001) compound twinned microstructure. Plastic deformation of martensite proceeds via peculiar deformation twinning and kinking assisted by [100]/(011) dislocation slip, which enables the nanocrystalline NiTi wire to deform at ∼1 GPa engineering stress up to very large plastic strains ∼50% with small strain hardening and brings about refinement of the austenitic microstructure of the NiTi wire down to nanoscale.
Permanent Link: http://hdl.handle.net/11104/0330558