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Monitoring tensile fatigue of superelastic NiTi Wire in liquids by electrochemical potential
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SYSNO ASEP 0449564 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Monitoring tensile fatigue of superelastic NiTi Wire in liquids by electrochemical potential Author(s) Racek, Jan (FZU-D) RID, ORCID
Stora, M. (FR)
Šittner, Petr (FZU-D) RID, ORCID
Heller, Luděk (FZU-D) RID, ORCID
Kopeček, Jaromír (FZU-D) RID, ORCID
Petrenec, M. (CZ)Source Title Shape Memory and Superelasticity - ISSN 2199-384X
Roč. 1, č. 2 (2015), s. 204-230Number of pages 27 s. Language eng - English Country DE - Germany Keywords nitinol ; shape memory alloy ; corrosion ; fatigue ; tensile test ; electrochemistry ; hydrogen embrittlement Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GB14-36566G GA ČR - Czech Science Foundation (CSF) GA14-15264S GA ČR - Czech Science Foundation (CSF) GAP107/12/0800 GA ČR - Czech Science Foundation (CSF) LO1409 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support FZU-D - RVO:68378271 DOI 10.1007/s40830-015-0020-5 Annotation Fatigue of superelastic NiTi wires was investigated by cyclic tension in simulated biofluid. The state of the surface of the fatigued NiTi wire was monitored by following the evolution of the electrochemical open circuit potential (OCP) together with macroscopic stresses and strains. The ceramic TiO2 oxide layer on the NiTi wire surface cannot withstand the large transformation strain and fractures in the first cycle. Based on the analysis of the results of in situ OCP experiments and SEM observation of cracks, it is claimed that the cycled wire surface develops mechanochemical reactions at the NiTi/liquid interface leading to cumulative generation of hydrogen, uptake of the hydrogen by the NiTi matrix, local loss of the matrix strength, crack transfer into the NiTi matrix, accelerated crack growth, and ultimately to the brittle fracture of the wire. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2016
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