In-situ Grain Rotation in Annealing via Polycrystal Energy-Resolved Laue Diffraction

Abstract

In principle, a polycrystal X-ray Laue pattern can contain reflections from every irradiated grain. The present communication examines how this fact can be used to good effect in in-situ experimentation. A critical step is indexation of the pattern at time equals zero. The more grains that can be indexed in a single pattern, the more powerful the technique becomes. Once indexed, it is possible to monitor grain scale evolution of orientation, intensity and mosaicity, without sample rotation, which provides additional freedom in experimental set-up, frame rates and fine grain microstructures. Rotations of magnesium grains within a AZ91 polycrystal are examined in the present study using three approaches to indexation: manual, dynamic and energy resolving. The latter is the most promising and we describe it as Polycrystal Energy-Resolved Laue Diffraction.