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Screw dislocation core structure and plastic deformation of BCC Metals
Author(s) -
Kuramoto E.,
Aono Y.,
Tsutsumi T.
Publication year - 1984
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170190308
Subject(s) - core (optical fiber) , dislocation , materials science , lattice (music) , condensed matter physics , crystallography , stress (linguistics) , crystal structure , deformation (meteorology) , physics , chemistry , composite material , linguistics , philosophy , acoustics
Abstract The core structure and an energy distribution around a screw dislocation core in model bcc lattice have been investigated in both unstressed and stressed states to clarify the controlling factors which determines the core type and the shape of P EIERLS potential. In the case of iron total four types of core structure were obtained, namely, unpolarized, polarized, split and high energy position and the shape of P EIERLS potential was so‐called camel hump type which gives a steadfast explanation for the presence of a hump on the yield stress — temperature curve of iron single crystal. The calculated results for the spatial distribution of the P EIERLS potential around a core show that the range of distribution is relatively small in the low P EIERLS stress case (iron), but is large in high P EIERLS stress case (vanadium).