Dislocation dynamics modelling of dislocation-loop interactions in irradiated metals

The resistance dislocation loops provide to the glide of dislocations is an important element of several features of plasticity of irradiated metals. In the present work, a dislocation dynamics model based on the elasticity treatment of dislocations, with self-stress effects included, has been used...

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Bibliographic Details
Published in:Philosophical magazine (2003. Print) 2005-01, Vol.85 (2-3), p.171-188
Main Authors: Rong, Z., Mohles, V., Bacon, D.J., Osetsky, Yu. N.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals
microstructure
DISLOCATIONS
DISTRIBUTION
ELASTICITY
Exact sciences and technology
HARDENING
IRRADIATION
Linear defects: dislocations, disclinations
MATERIALS SCIENCE
MATHEMATICAL MODELS
METALS
Physics
PLASTICITY
STRESSES
Structure of solids and liquids
crystallography
Theories and models of crystal defects
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Summary:The resistance dislocation loops provide to the glide of dislocations is an important element of several features of plasticity of irradiated metals. In the present work, a dislocation dynamics model based on the elasticity treatment of dislocations, with self-stress effects included, has been used to investigate the critical applied stress required for a gliding dislocation to overcome the stress field of a row of sessile loops near the glide plane. The critical stress has been determined for wide ranges of loop size, spacing and distance from the glide plane. Various approximations to the loop distribution have been tested, including an edge dipole, a single dislocation and a row of infinitesimal loops. The infinitesimal loop model, in particular, is shown to give good agreement with the accurate simulation data over a wide range of loop size and spacing. The ranges of applicability are discussed and compared with previous treatments in which such approximations have been used to investigate hardening due to dislocation-loop interactions.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786430412331315644