X-ray diffractometry of stresses in the case of multiphase metal alloys

Surface residual stresses take an important place in the service lifetime of materials. X-ray diffraction is a non destructive method well adapted to evaluate such kind of stresses. However, in multiphase materials, it only allows to asses to the mechanical state of one particular constituent which is generally different from the material macroscopic one The mechanical state of each constituent in multiphase materials, induced by an uniaxial tensile loading, has been characterized by X-ray diffraction, and predicted thanks to a micro-mechanical model. The experimental results have been compared with the theoretical ones to evaluate if the X-ray diffraction method can be applied to multiphase materials.