Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 165, Issue -, Pages 114-120Publisher
ELSEVIER
DOI: 10.1016/j.commatsci.2019.04.036
Keywords
Persistent slip bands; Metal fatigue; Molecular dynamics
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0019378]
- U.S. Department of Energy (DOE) [DE-SC0019378] Funding Source: U.S. Department of Energy (DOE)
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This work elucidates the dependence of operating stress of persistent slip bands (PSB) on the channel width and wall dislocation density. Using Cu as a model system and molecular dynamics as the main investigative tool, a new length scale effect, namely the wall dislocation spacing, is provided to enhance theoretical understanding of PSBs. It is discovered that the operation of PSB is a thermally activated event in which operating stress is inversely related to the wall dislocation spacing, strain rate and temperature. Leveraging the existing framework of confined layer slip in nanoscale metallic multilayers and classical nucleation theory, a mathematical model describing the rate- and temperature- dependent PSB operating stress is proposed.
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