Key points are not available for this paper at this time.
The behavior of the screw dislocation core in the presence of an external shear stress has been examined for the body-centered cubic and hexagonal close-packed phases of a model sodium lattice, using an effective ion–ion potential calculated from first principles. The Peierls stress for screw dislocations in the b. c. c. lattice at 0 °K is dependent on the orientation of the applied shear stress, and has a minimum value of 0. 0105G, where G is the shear modulus, for slip in the twinning direction on 112 planes. The Peierls stress in the h. c. p. lattice is at least 25 times smaller. Dislocation movement in the model b. c. c. lattice takes place by unit translations on 110 planes, with the selection rule that no two consecutive translations can take place on the same slip plane.
Basinski et al. (Sun,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: