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Elastic and Core Anisotropies for the 〈111〉 Screw Dislocation in Cubic Crystals
Author(s) -
Hirth J. P.,
Lothe J.
Publication year - 1966
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.19660150207
Subject(s) - dislocation , slip (aerodynamics) , materials science , peierls stress , pile , anisotropy , core (optical fiber) , instability , condensed matter physics , stress (linguistics) , dislocation creep , composite material , mechanics , structural engineering , physics , optics , thermodynamics , linguistics , philosophy , engineering
The stress component s̀ rz which gives rise to an angular force between parallel screw dislocations is calculated. The stress components tend to stabilize a pile‐up of screws on a {112} plane, while they would add to the instability of pile‐ups on {110} planes. Sodium is an extreme case in which a pile‐up on {112} should be elastically stable so that it cannot disperse by cross‐slip. It is also demonstrated that in general there are asymmetries in the dislocation cores, which are manifested as important asymmetries in dislocation mobility and cross‐slip processes.