Implementing and Evaluating Far Field 3D X-Ray Diffraction at the I12 JEEP Beamline, Diamond Light Source.

Three Dimensional X-ray Diffraction (3DXRD) is shown to be feasible at the I12 JEEP Beamline of Diamond Light Source. As a demonstration, a microstructually simple low-carbon ferritic steel was studied in a highly textured and annealed state. A processing pipeline suited to this beamline was created, using software already established in the 3DXRD user community, enabling grain centre-of-mass positions, orientations and strain tensor elements to be determined. Orientations, with texture measurements independently validated from electron backscatter diffraction (EBSD) data, possessed a $\sim 0.1^\circ$ uncertainty, comparable to other 3DXRD instruments. The spatial resolution was limited by the far-field detector pixel size; the average of the grain centre of mass position errors were determined as $\pm$ $\sim$ 80 microns. An average per-grain error of $\sim 1 \times 10^{-3}$ for the elastic strains were also measured; this could be reduced in future experiments by improving sample preparation, data collection and analysis techniques. Application of 3DXRD onto I12 shows great potential, where its implementation is highly desirable due the flexible, open architecture of the beamline. User owned or designed sample environments can be used, thus 3DXRD could be applied to previously unexplored scientific areas.