Asymmetric X-ray line broadening caused by dislocation polarization induced by external load

An external load, even if smaller than the flow stress, generates dislocation rearrangement leading to a net polarization of the system. According to the theory of X-ray line broadening, this polarization leads to Bragg peak asymmetry. Here we present an experimental validation of the theory by in situ profile measurements on “elastically” deformed Cu single crystals. The profiles are evaluated by the “restricted moments method”. In agreement with the theory it is found that peak asymmetry increases with deformation.