Abstract
Loading path dependencies and control mode effects in polycrystalline shape memory NiTi were investigated using in situ neutron and synchrotron X-ray diffraction performed during mechanical cycling and thermal cycling at constant strain. Strain-controlled, isothermal, reverse loading (to ± 4%) and stress-controlled, isothermal, cyclic loading (to ± 400 MPa for up to ten cycles) at room temperature demonstrated that the preferred martensite variants selected correlated directly with the macroscopic uniaxial strain and did not correlate with the compressive or tensile state of stress. During cyclic loading (up to ten cycles), no significant cycle-to-cycle evolution of the variant microstructure corresponding to a given strain was observed, despite changes in the slope of the stress–strain response with each cycle. Additionally, thermal cycling (to above and below the phase transformation) under constant strain (up to 2% tensile strain) showed that the martensite variant microstructure correlated directly with strain and did not evolve following thermal cycling, despite relaxation of stress in both martensite and austenite phases. Results are presented in the context of variant reorientation and detwinning processes in martensitic NiTi, the fundamental thermoelastic nature of such processes and the ability of the variant microstructure to accommodate irreversible deformation processes.
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Acknowledgements
The authors would like to acknowledge funding from the NASA Fundamental Aeronautics Program., Supersonics Project (Grant No. NNX08AB51A) and Subsonic Fixed Wing Project (Grant No. NNX11AI57A). This work has benefited from the use of the Lujan Neutron Scattering Center at LANSCE, which was funded by the Office of Basic Energy Sciences (DOE). LANL is operated by Los Alamos National Security LLC under DOE under Contract No. DE-AC52-06NA25396. This work also benefitted from the use of the HEMS beamline at the German high-brilliance synchrotron radiation storage ring PETRA III at DESY. The authors thank T. Sisneros and D.W. Brown at LANL and N. Schell at DESY for technical support.
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Nicholson, D.E., Benafan, O., Padula, S.A. et al. Loading Path and Control Mode Effects During Thermomechanical Cycling of Polycrystalline Shape Memory NiTi. Shap. Mem. Superelasticity 4, 143–157 (2018). https://doi.org/10.1007/s40830-017-0136-x
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DOI: https://doi.org/10.1007/s40830-017-0136-x