Dislocation distributions as seen by X-ray line profiles

Abstract

Asymmetric X-ray line broadening is direct evidence for the existence of residual long-range internal stresses in plastically deformed metals containing heterogeneously distributed dislocations, especially dislocation cell structures. Asymmetric line profiles and concomitant long-range internal stresses were found after various types of deformation, such as tensile deformation, fatigue, compression and wire drawing over a wide range of strains from 2 × 10-3 to 1.52. As a general result, it is found that the long-range internal stresses increase monotonically up to about 15% strain and level off into saturation at larger strains.