Intrinsic Stacking Faults on {112} Planes in the B.C.C. Lattice

Abstract

The possibility of intrinsic stacking faults in the b.c.c. lattice is discussed for a central force model. The existence of stable stacking faults depends on the cut-off radius of the interatomic potential. For rather small cut-off radii the model predicts stacking faults. However, we obtain stacking fault, vectors different from those predicted by the hard-sphere model. Further, the asymmetry of the stacking fault energy surface 6 with respect to displacements in h (111) directions depends on the cut-off radius.

Stacking-fault energies in simple metals: applications to BCC metals

“…Some controversy remains as to whether such faults even exist. The theoretical calculations have been split on this issue : Vitek (1968), Basinski et a1 (1970) and Rao (1975) do not find stable stacking faults on the [ 112) planes whereas Eichler and Pegel (1969) do. All four calculations used the direct space method and so are possibly suspect to convergence problems, depending on whether their potential is short-or long-range.…”

The dislocation morphology in deformed and irradiated niobium

“…Several workers (21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31) performed theoretical analyses on the core structure of dislocations. Because of the uncertainty concerning (1) the mode and the extent of elastic relaxation,…”