On the coupling between martensitic transformation and plasticity in NiTi: Experiments and continuum based modelling

0494430 - ÚJF 2019 RIV GB eng J - Článek v odborném periodiku
Šittner, Petr - Sedlák, Petr - Seiner, Hanuš - Sedmák, P. - Delville, R. - Heller, Luděk - Kadeřávek, Lukáš
On the coupling between martensitic transformation and plasticity in NiTi: Experiments and continuum based modelling.
Progress in Materials Science. Roč. 98, č. 10 (2018), s. 249-298. ISSN 0079-6425. E-ISSN 1873-2208
Grant CEP: GA MŠMT LM2015048; GA MŠMT EF16_013/0001794
Institucionální podpora: RVO:61389005
Klíčová slova: shape memory alloy * Martensitic transformation * plasticity * thermomechanical loading * mechanics modelling * X-ray diffraction * Nitinol * transmission electron microscopy
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 23.725, rok: 2018

Recent macroscopic experimental and theoretical evidence on the stress-strain-temperature behavior of NiTi beyond the strain recoverability limits (large strain, high stress, high temperature), where reversible martensitic transformation tends to proceed together with irreversible plastic deformation processes, is reviewed. Model predictions on the transformation plasticity coupling are laid out based on the mathematical theory of martensitic microstructures and the crystal plasticity theory. A particular attention is paid to the strain compatibility at moving phase interfaces that may have a direct impact on the plasticity accompanying the martensitic transformation. It is suggested that strong transformation-plasticity coupling shall be expected during the reverse martensitic transformation. Macroscopic models from the literature capable of simulation of thermomechanical responses of NiTi polycrystals due to coexisting martensitic transformation and plastic deformation are reviewed. Dedicated thermomechanical loading experiments on superelastic and actuator NiTi wires aimed at improving our understanding of the coupling between martensitic transformation and plasticity are presented. Based on the results of in-situ studies during thermomechanical loading experiments (electric resistance, synchrotron Xray diffraction, surface strain by DIC, relaxations) and characterization microstructures in deformed wires by TEM, it is shown that: (i) microstructures and consequently functional properties of annealed NiTi wires can be purposely manipulated by thermomechanical processing, (ii) shape setting of NiTi can be performed at relatively low temperatures (< 300 degrees C), (iii) strain drift of NiTi actuators can be brought under control utilizing the knowledge derived from the presented experiments.
Trvalý link: http://hdl.handle.net/11104/0287620