Abstract
This investigation addresses a new finding on the formation of twins ∼100–500 nm thick in nanocrystalline Cu during cyclic deformation. This twin formation is related to the emission of Shockley partials from extensively migrating grain boundaries. Given the similarities of formation mechanism and morphology to those observed during annealing, these twins were termed mechanically driven annealing twins. Moreover, the dynamic interactions between dislocations and twin boundaries were also explored, as these interactions may hinder the propagation of twins.
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