Deformation twins in nanocrystalline Al

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Review on superior strength and enhanced ductility of metallic nanomaterials (2018, background): “Twinning mechanisms observed and proposed in NC fcc metals by both MD simulations [84,95] and HRTEM [13] include homogeneous nucleation by the coincidental overlapping of two stacking fault ribbons formed by dissociated lattice dislocations [82], grain boundary splitting and migration [91], overlapp”
Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts (2018, background): “Exactly, NT Al is firstly predicted by MD simulation(139) and observed in experiments by cryogenic ball milling.(140) Only limited work reported the successful fabrication of growth and deformation twins in Al currently.”
Design of Stable Nanocrystalline Alloys (2012, background): “Main Text: When the grain, or crystallite, size in a polycrystal is reduced below about 100 nm, grain boundary or interface physics begin to dominate over conventional crystal physics (1-4).”
Deformation twinning in polycrystalline copper at room temperature and low strain rate (2006, methodology): “, homogeneous nucleation of twins inside grains by the dynamic overlapping of SFs and the twin lamella formation via the dissociation and migration of GB segments [28], were also confirmed in NC Al produced by cryogenic ball milling [29,30].”