期刊
ACTA MATERIALIA
卷 99, 期 -, 页码 130-139出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.07.073
关键词
Discrete dislocation dynamics; Dislocation multiplication; Glissile junction
资金
- German Research Foundation (DFG) [WE3544/5-1]
- Ministry of Science, Research and Arts
- Universities of the State of Baden-Wurttemberg, Germany (DFG)
Dislocation junctions are considered to control the hardening behavior of crystalline materials during plastic deformation. Here the influence of the glissile junction on the plastic deformation of microscale samples is investigated, based on discrete dislocation dynamics simulation results. It is found that with increasing dislocation density rho, sample size d, which can be collapsed into a single dimensionless parameter d root rho, and an increasing number of activated slip systems due to different global crystallographic orientations, the glissile junction forms frequently and can bow out easily, acting as an effective source. The resulting new dislocations are mobile and contribute to the macroscopic plastic deformation on the order of 30-60%. In the size regime from 0.5 to 2 mu m and dislocation densities in the range of 10(12)-10(14) m(-2), the glissile junction is therefore an important source for generating mobile dislocation density. Furthermore a significant correlation between stress drops and activity of dislocations originating from glissile junctions is found. A rate formulation is proposed to include these findings in crystal plasticity or continuum dislocation density frameworks. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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