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Free Energy Function Of Dislocation Densities By Large Scale Atomistic Simulations, Cristoph Begau, Godehard Sutmann, Alexander Hartmaier

Nanomechanical Testing in Materials Research and Development V

The energy of complex dislocation microstructures is a fundamental property of continuum plasticity on the nanoscale. The question how the energy depends on the characteristic of a dislocation network is still not fully answered, although various - and often contradicting - models have been proposed in the literature.

In this talk, this question is addressed using large scale Molecular Dynamics simulations of nanoindentation, which have been conducted to gain insight into the relationship between dislocation microstructures and the associated free energy from an atomistic level. Several single crystalline samples of aluminum are indented using varying tip radii to study possible …