The atomic structure and dynamic behavior of interstitial clusters - a bundle of <110> crowdions – were investigated in a model Ni lattice. An extended dislocation loop was obtained after full relaxation of a loop of hexagonal shape, consisting of 4 dislocation segments which lay on {111} slip planes and 2 dislocation segments on (100} slip planes. The dislocation segments on {111} slip planes were extended, but the segments on {100} slip planes were not extended. The Peierls stress for the dislocation loop was obtained by observing the motion of a dislocation loop under an axially symmetrical shear stress. A diamond-shaped dislocation loop was also constructed in the model lattice. This consisted of 4 dislocation segments on (111) slip planes, with no segments on {100} slip planes. The Peierls stress for this diamond-shaped dislocation loop was found to be less than that for the hexagonal dislocation loop.

Computer Simulation of Atomic Properties and Dynamic Behavior of Interstitial Clusters in Ni. E.Kuramoto, K.Ohsawa, T.Tsutsumi: Journal of Computer-aided Materials Design, 2000, 7[2], 89-95