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Bright field TEM images and the corresponding electron-diffraction analysis from the selected area of the three steels with different Cu content tempered at 600 °C for 2 h: (a) 0Cu-steel, (b) 1Cu-steel, and (c) 3Cu-steel. (d) The HAADF-STEM images and EDS mappings of Cu, Ni, and Cr corresponding to the white region in (c).
