Slip localization in Inconel 718: A three-dimensional and statistical perspective

The slip localization behavior of the polycrystalline nickel base superalloy Inconel 718 during monotonic tensile loading at room temperature, is investigated for first time in relation to 3D microstructure. Multi-modal data merging tools are used recombine high resolution digital image correlation (HR-DIC) with electron back-scatter diffraction tomography (3D EBSD), over a wide region interest. This procedure enables reconstruction band planes Statistical analyses conducted 500 individual bands reveal strong correlations between their location and specific microstructure configurations. In particular, half emanate from triple junction lines defined by three crystals). Moreover, most intense longest bands, which would become critical fatigue crack nucleation sites cyclic loading, located close parallel particular annealing twin boundaries simultaneously connected lines. Crystal plasticity finite elements calculations performed on experimental identify activity that results formation intensity (localized plasticity) or zones lattice rotation (non-localized these regions.