| Abstract Scope |
Under monotonic or cyclic straining, slip can localize within individual grains, creating intense slip bands that serve as precursors for cracks. To date, a better understanding of the spatially resolved slip patterns that result in the severest irreversibilities is desired. Using a suite of 3D spatially resolved crystal plasticity models, we investigate the evolution of intragranular slip activity and lattice rotations during monotonic and cyclic loading in a Ni-based superalloy. The model microstructure is a highly resolved, mirror representation of the experimental sample. We show that grains preferentially accommodate deformation by activating different slip systems in distinct regions of the same grain and gradients in lattice rotation divide these regions. The polarized gradients, marked by changes in sign, intensify in reverse straining and with further cycling. These results can provide insight into how irreversibilities develop after many cycles from initially homogeneous grains and the microstructural properties prone to such irreversibilities. |