Effect of alloying on dislocation core structure in the Zr--Nb--Mo--Re system as determined by discrete lattice modeling

Semiempirical pairwise interatomic potential functions have been constructed for the Zr-Nb-Mo-Re bcc alloys from the measured second order anisotropic elastic constants. These potentials then were used in a small lattice model to determine the restoring force for shear on the (110) plane, from which non-screw dislocation core structure and Peierls stress can be assessed. The results are strongly dependent upon the potential functions used, but indicate that alloying might be expected to change non-screw dislocation Peierls stress