Diffraction methods are commonly used for the determination of the elastic lattice deformation and distortion from the displacement and little boys shorts broadening of the diffraction peak.These methods enable researchers to measure stresses and elastic properties of polycrystalline materials.The main advantages of diffraction methods are their non-destructive character and the possibility of macrostress and microstress analysis for multiphase and anisotropic materials.Measurements are performed selectively only for crystallites contributing to the measured diffraction peak, i.e.
for the grains having lattice orientations for which the Bragg condition is satisfied.When several Fly Veil phases are present in the sample, measurements of separate diffraction peaks allow for the behaviour of each phase to be investigated independently.This method can be applied without any limitations to flat specimens.