Description of grain lattice rotation and fragmentation mechanisms using crystal plasticity

Abstract

Abstract. The goal is to construct a physically based, mathematically correct multilevel model of intensive inelastic deformation of mono-and polycrystalline taking into account the evolution of the orientation of structural elements, rotations of crystal lattices of crystallites, allowing one to obtain the physical and mechanical properties of the sample at the macro level. The general structure of the multilevel models of inelastic deformation of materials, including the description of the evolution of the internal structure, is considered. A model of crystallite lattice rotations that takes into account the incompatibility of slip dislocations in neighboring grains is proposed. The results of numerical experiments for ECAP agree well with the experimental data.

Investigation of Grain Refinement Mechanism of Nickel Single Crystal during High Pressure Torsion by Crystal Plasticity Modeling

“…The formation of grain boundaries is accompanied by the rotation of individual structural elements. Crystal plasticity modelling, which is based on the assumption of crystallographic slip and stretching and rotating of the crystal lattice when the crystalline material undergoes deformation, provides a potential way to explore the underlying mechanism of grain refinement, as reported for KOBO extrusion [22], cyclic expansion–extrusion [23], equal channel angular pressing process [24], etc. However, for the HPT process, very few studies associated with crystal plasticity have been reported in the literature.…”