Development of 3d deformation analysis method in polycrystalline metal by combining synchrotron radiation tomography with X-Ray diffraction

The aim of this study was to establish a novel orientation analysis method that utilizes accurate grain position information, obtained by grain boundary tracking, to enable crystal-plasticity deformation analysis of polycrystalline metals. An experiment combining X-ray tomography and X-ray diffraction was performed, and the feasibility of the method was assessed by confirming the relation between diffraction spots and grains whose position was obtained by grain boundary tracking. Although some deviations were observed in diffraction spot intensity, owing to lack of beam stability and the extinction effect, several combinations of grain and spot features showed a high correlation. Furthermore, the diffraction spots originating from grains whose position was detected using grain boundary tracking showed higher correlation coefficients than those originating from grains whose position was detected using 3DXRD. In the case of the former grains, we could easily identify diffraction spots originating from specific grains by focusing on sets of grain and spot features having a high correlation. It was demonstrated that setting appropriate tolerance level enabled highly accurate orientation analysis, almost equivalent to that of 3DXRD.