Slip system activity and lattice rotation in polycrystalline copper during uniaxial tension

The heterogeneous evolution of intragranular strain within polycrystalline copper grains is evaluated by in-situ electron back-scattering diffraction during uniaxial tension. Deformation heterogeneity between grains causes a proliferation of slip bands within grains and leads to lattice rotation within grains. The magnitude of intragranular orientation gradient development caused by lattice rotation is dependent on the initial grain orientation as well as grain interactions with its local neighbourhood. Uniaxial tensile deformation is accommodated by the activation of coplanar and non-coplanar slip systems with the highest and second highest Schmid factor values. Non-coplanar slip is predominantly observed in unstable (011) and Other (i.e.-those that do not belong to the (111), (001), and (011) fibres) grains. Viscoplastic self-consistent simulations revealed that the interactions with the homologous effective mediums provide additional rotation pathways for unstable (011) and Other grains to rotate towards more stable (111) and (001) orientations. (c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Automated summary

The heterogeneous evolution of intragranular strain within polycrystalline copper grains during uniaxial tension was evaluated using in-situ electron back-scattering diffraction. Deformation heterogeneity between grains led to a proliferation of slip bands within grains and lattice rotation. The development of intragranular orientation gradient caused by lattice rotation depended on the initial grain orientation and grain interactions with its local neighborhood.