Dislocation networks in (111) twist boundaries

Abstract

A study has been made of (111) twist boundaries in bicrystals of gold with misorientations close to zero and close to the twin misorientation (60°). Closely spaced networks of dissociated dislocations enclosing intrinsic stacking faults in the low-angle boundaries were observed. In the near-twin boundaries networks of perfect interfacial (DSC) dislocations were found but none were observed in the hexagonal arrangement as expected. These observations are interpreted both in terms of conventional dislocation dissociation reactions involving steps at the interface and in terms of the displacement space and symmetry arguments presented by Pond (1977).