UNIFICATION OF THE PEIERLS AND THE FRIEDEL MODELS INTO A GENERAL COMBINED THEORY OF DISLOCATION PINNING

A theory of dislocation motion in a combined relief formed by superpos ition of extended Peierls-Nabarro barriers and local obstacles is deve loped. A mixed, or intermediate between the Peierls and Friedel regime s, mode of dislocation motion is predicted and studied. Specific featu res of material plasticity in the vicinity of transition between diffe rent regimes are described in detail. A new method of decomposition of two hardening mechanisms for the determination of material parameters from experimental data is suggested. The theory developed is applicab le to BCC-based dilute solid solutions, semiconductors, and other mate rials with a high potential relief of the crystal lattice. (C) 1997 El sevier Science S.A.