Premium
Fluctuation Unpinning of Dislocations
Author(s) -
Zilberman L. A.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221370208
Subject(s) - dislocation , physics , diffusion , action (physics) , stress (linguistics) , fokker–planck equation , particle (ecology) , condensed matter physics , statistical physics , thermodynamics , quantum mechanics , linguistics , philosophy , oceanography , geology , differential equation
The dynamics of thermally activated unpinning of dislocations from point defects under the action of an applied stress is studied. It is shown that the Fokker‐Planck infinite‐dimensional equation describing the diffusion of a particle in the configurational space is reduced to a one‐dimensional one in the concentrated‐force approximation. Moreover it is shown that over a wide range of parameters dislocation unpinning from the point defect occurs in two stages: at the first stage the dependence of the unpinning probability on the initial configuration of a dislocation disappears and at the second stage the system, passes from one stationary state to another. Characteristic times of the problem are found, and their dependence on temperature and dislocation length are studied.