Power-Law Creep from Discrete Dislocation Dynamics

We report two-dimensional discrete dislocation dynamics simulations of combined dislocation glide and climb leading to `power-law' creep in a model aluminum crystal. The approach fully accounts for matter transport due to vacancy diffusion and its coupling with dislocation motion. The existence...

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Bibliographic Details
Published inarXiv.org
Main Authors Keralavarma, Shyam M, Cagin, Tahir, Arsenlis, Tom, Benzerga, A Amine
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 25.12.2017
Subjects
Aluminum
Computer simulation
Dislocation mobility
Lattice vacancies
Physics - Mesoscale and Nanoscale Physics
Power law
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Summary:We report two-dimensional discrete dislocation dynamics simulations of combined dislocation glide and climb leading to `power-law' creep in a model aluminum crystal. The approach fully accounts for matter transport due to vacancy diffusion and its coupling with dislocation motion. The existence of quasi-equilibrium or jammed states under the applied creep stresses enables observations of diffusion and climb over time scales relevant to power-law creep. The predictions for the creep rates and stress exponents fall within experimental ranges, indicating that the underlying physics is well captured.
ISSN:2331-8422
DOI:10.48550/arxiv.1712.09103