The internal structure of planar dislocation boundaries was investigated by combining experimental observations of extended geometrically necessary boundaries, in deformed single crystals, with dislocation dynamics simulations. The internal dislocation structure of a geometrically necessary boundary was first considered by using standard diffraction contrast analysis to identify boundary Burgers vectors in a transmission electron microscope. This result was then used in the context of a large range of boundaries by calculating boundary misorientation-angle/axis pairs on the basis of Kikuchi pattern analyses of orientations on either side of the boundaries. The boundary misorientation axes which, together with the boundary normal, permitted the estimation of the contribution which primary and secondary dislocations made to boundary rotations were of special interest. Selected boundaries were constructed by using experimental data, crystal plasticity analyses and Frank’s formula. These constructed boundaries were equilibrated by using a computer program, and the internal stress field of the boundary was determined.

Internal Structures of Deformation Induced Planar Dislocation Boundaries. D.A.Hughes, S.M.A.Khan, A.Godfrey, H.M.Zbib: Materials Science and Engineering A, 2001, 309-310, 220–6