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• W3139290140 abstract "Abstract Dislocation glide is a general deformation mode, governing the strength of metals. Via discrete dislocation dynamics and molecular dynamics simulations, we investigate the strain rate and dislocation density dependence of the strength of bulk copper and aluminum single crystals. An analytical relationship between material strength, dislocation density, strain rate and dislocation mobility is proposed, which agrees well with current simulations and published experiments. Results show that material strength displays a decreasing regime (strain rate hardening) and then increasing regime (classical forest hardening) as the dislocation density increases. Accordingly, the strength displays universally, as the strain rate increases, a strain rate-independent regime followed by a strain rate hardening regime. All results are captured by a single scaling function, which relates the scaled strength to a coupling parameter between dislocation density and strain rate. Such coupling parameter also controls the localization of plasticity, fluctuations of dislocation flow and distribution of dislocation velocity." @default.
• W3139290140 created "2021-03-29" @default.
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• W3139290140 date "2021-03-23" @default.
• W3139290140 modified "2023-10-06" @default.
• W3139290140 title "Strain rate dependency of dislocation plasticity" @default.
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• W3139290140 doi "https://doi.org/10.1038/s41467-021-21939-1" @default.
• W3139290140 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7988163" @default.
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