Temperature and microstructure dependent tensile behavior of coarse grained superelastic NiTi

0570387 - FZÚ 2024 RIV GB eng J - Journal Article
Alarcón Tarquino, Eduardo - Heller, Luděk - de Prado, Esther - Kopeček, Jaromír
Temperature and microstructure dependent tensile behavior of coarse grained superelastic NiTi.
Materials and Design. Roč. 226, Feb (2023), č. článku 111617. ISSN 0264-1275. E-ISSN 1873-4197
R&D Projects: GA ČR(CZ) GA22-15763S; 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
Keywords : martensitic transformation * shape memory alloys * superelasticity * deformation twinning * NiTi * microstructure * deformation infrared calorimetry
OECD category: Materials engineering
Impact factor: 8.4, year: 2022
Method of publishing: Open access

In this work, effects of temperature and microstructure on tensile behavior of superelastic NiTi wires were analyzed. We analyzed cold-drawn NiTi wires of 1.78 mm that received four different final heat treatments using short direct electrical current pulses. Final coarse-grained microstructures ranged from recovered up to fully recrystallized microstructure with grain size of 25 µm. Effects of temperature in the range 30–130 °C were analyzed using monotonous tensile tests where a temperature gradient was induced along the sample axis. Deformation processes related to martensitic transformation and plastic deformation were characterized by temperature resolved stress–strain responses, deformation work, released heat, volume fraction of martensite. Deformation-induced microstructure changes were analyzed post-mortem using Electron Backscatter Diffraction and x-ray diffraction.
Permanent Link: https://hdl.handle.net/11104/0341702