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Lattice defects in Cu deformed by high-pressure torsion (HPT) were investigated by positron annihilation spectroscopy (PAS) combined with transmission electron microscopy, X-ray diffraction (XRD) and Vicker’s microhardness (HV) measurements. The evolution of the microstructure during HPT processing was studied on samples subjected to various numbers of HPT revolutions using pressures of 2 and 4GPa...
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