Abstract Scope |
We present first results from the hard x-ray microscope recently established at ESRF, Grenoble. Using dark-field X-ray microscopy, DFXM, we directly visualize the long-range strain fields arising from a multitude of dislocations as they move and interact over hundreds of micrometers, deep inside the bulk. Our experiments reveal the cooperative thermal motion of a dislocation boundary and its interaction with a low-angle grain boundary in aluminum. We zoom in to resolve the mechanism by which a free dislocation inserts into the boundary and contrast this with another dislocation that emits from the boundary. This new approach has the potential to directly guide and validate multiscale models of microstructure and dislocation patterning. We outline the potential and limitations of DFXM for understanding patterning and for multiscale modelling of mechanical properties.
This work represent collaborative efforts involving DTU, ESRF, LLNL and Purdue. |