Published online by Cambridge University Press: 22 February 2011
The structure of a low angle tilt boundary with a [110] misorientation axis and a (111) initial boundary plane in a bicrystal prepared by a hot-pressing technique has been studied. The boundary consists of a periodic array of dislocations as expected but contains a new feature, namely microtwins which lie parallel to the boundary plane. High resolution transmission electronmicroscopy has been used to characterize the boundary structure and to determine the Burgers vector of the dislocations present. The relationship between the structure of the twin-free regions and the twinned regions is discussed.