X-ray diffraction assessment of complex sample states on the basis of “combined analysis”

Abstract

The multi-reflection grazing-incidence X-ray diffraction technique and the analysis of the thereby recorded datasets are extended in this paper on hexagonal lattice types with distinct elastic anisotropy. The evaluation of the complete stress tensor is based on X-ray diffraction pattern decomposition and considers for texture by the spherical harmonics approach. This procedure, following the directives of “combined analysis”, enables the extraction of the mean macroscopic strain/stress tensor weighted by texture assuming a quasi-isotropic state with respect to sample elasticity. The procedure has been applied to study plastic deformation and the resulting evolution of triaxial stress states in zinc green-compacts after uniaxial compression. Due to the application of asymmetric diffraction and associated with the chosen incidence angle the method focuses on the near-surface region.