On the coupling between martensitic transformation and plasticity

Research output: Contribution to journalArticle

Authors

  • Petr Sittner
  • Petr Sedlák
  • Hanus Seiner
  • Pavel Sedmak
  • Ján Pilch
  • Ludek Heller
  • Lukás Kaderávek
  • Rémi Delville

Institutes & Expert groups

  • Nuclear Physics Institute of the CAS
  • HZDR - Helmholtz Zentrum Dresden Rossendorf - ESRF - The Rossendorf Beamline

Documents & links

Abstract

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 °C), (iii) strain drift of NiTi actuators can be brought under control utilizing the knowledge derived from the presented experiments.

Details

Original languageEnglish
Pages (from-to)249-298
Number of pages50
JournalProgress in materials science
Volume98
DOIs
Publication statusPublished - 7 Jul 2018

Keywords

  • Shape memory alloy, Martensitic transformation, plasticity, thermomechanical loading, mechanics modelling, X-ray diffraction, nitinol, Transmission electron microscopy

ID: 4614953