The strength of polycrystalline materials is well known to increase with decreasing grain size. Below a certain 'strongest size' however, this behaviour is reversed. Mapping the deformation mechanisms in nanoscale materials by molecular dynamics simulation clarifies why.
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Yip, S. Mapping plasticity. Nature Mater 3, 11–12 (2004). https://doi.org/10.1038/nmat1053
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DOI: https://doi.org/10.1038/nmat1053
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