Grain-resolved analysis of localized deformation in nickel-titanium wire under tensile load

Authors

P. Sedmák1,2, J.Pilch1, L.Heller1, J.Kopeček1, J.Wright3, P.Sedlák4, M.Frost4, P.Šittner1

Citation
Science 353 (2016) 559–562, doi: 10.1126/science.aad6700
DOI
10.1126/science.aad6700
Year
2016

3D x-ray diffraction method at ESRF Grenoble (ID11 beamline) was applied to investigate grain resolved internal stress and strain around the martensite band front propagating in 0.1mm thin superelastic NiTi wire deformed in tension, We reconstructed internal stress and strain fields around the front and performed simulation by finite element implements SMA model. In this way we managed to solve the mesoscopic mechanism of localized deformation in NiTi.

image001.png
Topology and internal stress around martensite band front propagating during tensile deformation of superelastic NiTi wire

1Institute of Physics, Czech Academy of Sciences, Na Slovance 1992/2, 1822 Prague, Czech Republic.
2Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 12000 Prague, Czech Republic.
3European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38043 Grenoble, France.
4Institute of Thermomechanics, Czech Academy of Sciences, Dolejškova 1402/5, 18200 Prague, Czech Republic.