Peierls potential of screw dislocations in bcc transition metals: Predictions from density functional theory

摘要: It is well known that screw dislocation motion dominates the plastic deformation in body-centered-cubic metals at low temperatures. The nature of nonplanar structure dislocations gives rise to high lattice friction, which results strong temperature and strain rate dependence flow. Thus Peierls potential, responsible for resistance, an important physical property material. However, current empirical potentials give a complicated picture potential. Here, we investigate potential using density functional theory bcc transition metals. show shape sinusoidal every material investigated. Furthermore, magnitude scales strongly with energy per unit length