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Thermally activated dislocation motion in a solid containing a multiple spectrum of dislocation obstacles
Author(s) -
Frank W.
Publication year - 1968
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.19680260120
Subject(s) - dislocation , materials science , arrhenius equation , dislocation creep , condensed matter physics , slip (aerodynamics) , vacancy defect , peierls stress , crystallography , classical mechanics , thermodynamics , physics , chemistry , composite material , kinetics
A theoretical treatment is given of the thermally activated motion of dislocations in the presence of dislocation obstacles with different hardness. The hardness of an obstacle is allowed to depend on an arbitrary number of characteristic parameters (multiple obstacle spectrum). It is shown that even under these conditions the slip rate ȧ obeys an Arrhenius equation mean free activation enthalpy. The general theory is applied to the case of plastic flow in neutron‐irradiated copper. In this case the dislocation obstacles are vacancy dislocation loops of different sizes, different orientations, and different distances from the slip planes of the mobile dislocations (triple spectrum).