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Copper disks containing columns of aligned nanotwins were subjected to high-pressure torsion (HPT) involving a half turn under a 3GPa compressive stress. The overall shear strain of 21 at 1mm from the center of rotation is concentrated at the surfaces, where the columns of twins have been transformed into a 3-D grain structure to a depth of about 5μm. The remaining columns of twins were sheared in...
High-purity Cu samples containing parallel columns of highly aligned nanotwins separated by coherent Σ3 twin boundaries (TBs) with median spacing of about 35nm were subjected to tension–tension fatigue. It was found that the microstructure of highly aligned nanotwinned Cu is much more stable under deformation than that of nanocrystalline Cu. Hardness values underwent only modest drops, the greatest...
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