Stress field of a dislocation absorbed in a grain boundary: atomistic to continuum representation.
Modeling of Dislocation – Grain Boundary Interactions
The glide of dislocations and their interaction with obstacles determines the plastic deformation of metals. Structural materials usually consist of many crystallites (“grains”) of different orientations. The boundaries between these grains are strong obstacles to the propagation of slip. With smaller grain sizes, the effects of grain boundaries become more pronounced. Thus, the interaction of dislocations with grain boundaries plays a particular role in nanocrystal plasticity. (See also Plastic deformation and failure of nanostructured metals
In this project we use atomistic simulations to study in detail the interaction of dislocations with grain boundaries and to characterize grain boundaries with respect to their propensity to absorb or transmit lattice dislocations. In particular, the topology of the grain boundaries is studied in relation to the dislocation type and character. This information will be used to develop better mesoscale and continuum models of (nano-)polycrystal plasticity. This project is done in collaboration with the Institute of Materials Simulation
at the FAU and Dr. Katerina Aifantis (MINATRAN
ERC Starting Grant).
T. Klöffel, E. Bitzek, B. Meyer , Impact of twin boundaries on bulk elastic constants, Data in Brief 3 209 Link to paper