Kinetic Monte Carlo modeling of dislocation motion in BCC metals

We present a kinetic Monte Carlo (kMC) simulation method for modeling screw dislocation motion in BCC metals on the micron-second scales, using inputs from atomistic simulations of core mechanisms on the angstrom-picosecond s cale. The simulations use atomistic input such as double-kink nucleation en ergy and kink mobility, include linear elastic (Peach-Koehler) interactions between dislocation segments, and predict overall dislocation velocity at different temperature and stress states. In addition, an important mechanis m, namely, the spontaneous superjog growth and debris loop nucleation, is i dentified in the kMC simulation as an important factor controlling the disl ocation motion in the high stress and medium temperature regime. (C) 2001 E lsevier Science B.V. All rights reserved.