The synchrotron working group at M4D

The aims of our work group are to develop methodologies for 3D and 4D characterisation of polycrystalline materials exploiting high energy synchrotron radiation (above 40 keV) and novel tomographic reconstruction principles. And the use of such methodologies for basic science studies in materials science (plastic deformation, recrystallisation, phase transformations, hard nano-materials) and crystallography in general.
 
Jointly with the European Synchrotron Radiation Facility in Grenoble the group has developed the dedicated 3DXRD microscope, installed at the Materials Science Beamline ID11. Long-term collaborations also exist with the synchrotrons APS in Chicago and HASYLAB in Hamburg.

The majority of the activities are embedded within the Centre for Fundamental Studies: Metals Structures in Four Dimensions (M4D), funded by the Danish National Research Foundation.   Additional funding is provided by EU via the NEST program TotalCryst and by D3D - Digital Microstructures, a program funded by the ONR/DARPA. The group is also part of the Danish Centre for Synchrotron Radiation, Dansync.

RECENT NEWS: For the first time the dynamics of the dislocation structures within a metal has been visualised as function of deformation. To enable this in collaboration with APS we have developed a technique “ultra-high angular resolution 3DXRD”. The video shows the evolution of the mosaic spread of the (400) reflection from one deeply embedded grain in a Cu specimen while straining from 3.35% to 3.60%. Unexpectedly, the dislocation-free regions – giving rise to the peaks in the map above - is found to show intermittent dynamics, e.g. appearing and disappearing with proceeding deformation, even displaying transient splitting behaviour. Science 312, 889-892 (2006).


 

Page updated  by   06.01.2010


Henning Friis Poulsen
Research Professor
Materials Research (AFM)
Dir tel+45 46775739