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

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.

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.