Rate dependence of grain boundary sliding via time-scaling atomistic simulations

Approaching experimentally relevant strain rates has been a long-standing challenge for molecular dynamics method which captures phenomena typically on the scale of nanoseconds or at strain rates of 107 s−1 and higher. Here, we use grain boundary sliding in nanostructures as a paradigmatic problem t...

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Veröffentlicht in:Journal of applied physics 2017-02, Vol.121 (8)
Hauptverfasser: Hammami, Farah, Kulkarni, Yashashree
Format: Artikel
Sprache:eng
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Zusammenfassung:Approaching experimentally relevant strain rates has been a long-standing challenge for molecular dynamics method which captures phenomena typically on the scale of nanoseconds or at strain rates of 107 s−1 and higher. Here, we use grain boundary sliding in nanostructures as a paradigmatic problem to investigate rate dependence using atomistic simulations. We employ a combination of time-scaling computational approaches, including the autonomous basin climbing method, the nudged elastic band method, and kinetic Monte Carlo, to access strain rates ranging from 0.5 s−1 to 107 s−1. Combined with a standard linear solid model for viscoelastic behavior, our simulations reveal that grain boundary sliding exhibits noticeable rate dependence only below strain rates on the order of 10 s−1 but is rate independent and consistent with molecular dynamics at higher strain rates.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4977105