Abstract
It is known that the strength of nanotwinned copper increases with decreasing twin thickness, reaches a maximum at twin thickness of 15 nm, and then decreases with twin thickness down to 4 nm. To understand this behavior, critical resolved shear stresses of various slip modes in nanotwinned copper are investigated using molecular dynamics simulations. Based on the Sachs polycrystalline model, twin thickness dependent yield strengths are deduced that are in good agreement with experimental data. The strengthening-softening behavior is attributed to a transition from partial dislocations slipping in twin boundaries to detwinning induced by incoherent twin boundary migration.
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