High-resolution electron microscopy of grain boundaries in Ni3(Al0·8Ti0·2) bicrystals

This is the authors' abstract. We don't add key points for this paper.

The grain-boundary structure of [001] small-angle tilt boundaries in L12Ni3(Al0·8Ti0·2) bicrystals prepared by hot pressing was investigated by high-resolution transmission electron microscopy. Dislocations with a Burgers vector a[100] which are dissociated into two superpartials with Burgers vectors (a/2)[110] and (a/2)[110] connected by an antiphase boundary (APB) were found. The dissociated superpartials and the corresponding APB lie along the grain-boundary plane. The cores of the dissociated superpartials extend (or spread) over a few {011} atomic planes. Also, the preferred configuration of the dislocation array observed was discussed on energy considerations.