The X-ray diffraction method “high angular resolution 3DXRD” was briefly introduced, and results were presented for a single bulk grain in a polycrystalline copper sample deformed in tension. It was found that the three-dimensional reciprocal-space intensity distribution of a 400 reflection associated with the grain, exhibited a distinct structure consisting of sharp bright peaks superimposed on a cloud of enhanced intensity. The bright peaks (which arose from individual sub-grains) were found to be subjected to backward strain (on average) while the fraction of the material giving rise to the cloud of enhanced intensity was subjected to forward strain. Based upon the latter observation the, originally tentative, interpretation of the cloud as arising from dislocation walls was substantiated.

Direct Observation of Strain in Bulk Subgrains and Dislocation Walls by High Angular Resolution Three-Dimensional X-ray Diffraction. B.Jakobsen, U.Lienert, J.Almer, H.F.Poulsen, W.Pantleon: Materials Science and Engineering A, 2008, 483-484, 641-3