![© Max-Planck-Institut für Eisenforschung GmbH © Max-Planck-Institut für Eisenforschung GmbH](/3683657/header_image-1519815263.jpg?t=eyJ3aWR0aCI6ODQ4LCJmaWxlX2V4dGVuc2lvbiI6ImpwZyIsIm9ial9pZCI6MzY4MzY1N30%3D--bce7688073a49fabd462e1b645aacd994a225bbf)
Dislocation source activation at grain boundaries
While several methods are well-suited for studying dislocation transmission through grain boundaries, a quantitative approach understanding dislocation source activation in grain boundaries is currently lacking.
Within this work we are aiming for developing a test protocol, which can provide a statistical significant, quantitative measure for the dislocation source activation at grain boundaries.
For this purpose we apply several different experimental micromechanical techniques on pure copper bi-crystals. For instance nanoindentation, using a spherical nanoindenter, is used to obtain differences in the pop-in behavior of bulk single crystals and their fine grained counter bodies. The attached figure shows the variation of pop-in forces depending on the dislocation density of the material.
![Pop-in statistics: The cummulative probability of a certain pop-in force is given for copper with three different dislocation densities.](/3754743/original-1518446991.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjM3NTQ3NDN9--8b7486bd7d3fb7878da8df85ee8073b4a677f390)
Pop-in statistics: The cummulative probability of a certain pop-in force is given for copper with three different dislocation densities.
© Max-Planck-Institut für Eisenforschung GmbH