Electrochemistry of NiTi wires/springs subjected to static/cyclicloadings

0456642 - FZÚ 2016 RIV NL eng C - Conference Paper (international conference)
Racek, Jan - Šittner, Petr - Heller, Luděk - Pilch, Jan - Sedlák, Petr - Kadeřávek, Lukáš
Electrochemistry of NiTi wires/springs subjected to static/cyclicloadings.
Materials Today: Proceedings ICOMAT 2014. Amsterdam: Elsevier Ltd, 2015 - (San Juan, J.; López-Echarri, A.; Nó, M.; López, G.), s. 965-969. 2. ISSN 2214-7853.
[International Conference on Martensitic Transformations ICOMAT 2014. Bilbao (ES), 06.07.2014-11.07.2014]
R&D Projects: GA ČR GA14-15264S; GA ČR GB14-36566G
Institutional support: RVO:68378271 ; RVO:61388998
Keywords : shape memory alloy * NiTi wires/springs * corrosion fatigue * cyclic loading * electrochemistry
Subject RIV: BM - Solid Matter Physics ; Magnetism

In the context of the ongoing research addressing problems of random clinical failures of braided esophageal NiTi stents, we introduce novel in-situ electrochemical methods for investigation of corrosion fatigue of superelastic NiTi wires or springs subjected to cyclic mechanical loadings in simulated body fluids. Corrosion fatigue properties of NiTi are very different from conventional materials due to the intrinsic recoverable deformability of the surface originating from martensitic transformation. It is shown that the localized corrosion of phase transforming NiTi is strongly facilitated by cracking of the surface oxide, crack opening/closing and passivation, mutually competing during cyclic mechanical loading in fluids
Permanent Link: http://hdl.handle.net/11104/0257143