Abstract
Abstract Annealed and cold rolled pure copper targets were impacted by 4 mm diameter GCrl5 steel ball with a speed of 1.5 km/s. The microstructure near the crater and the influence of cold rolling on the homogeneity of deformation under impact were studied. The results show that the cold rolling deformation improves the homogeneity of bulk deformation near the crater. Abundant microbands (MBs) are observed near craters of the two types of target by transmission electron microscope (TEM), and no twins are found. Linear features are observed in grains 2–3 mm away from the crater. TEM observations show that these linear features are very fine microbands.
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