Fig. 1: In situ X-ray nano-tomography experiment to directly visualize the dealloying process in Ni–20Cr alloy in molten KCl–MgCl2 at 800 °C.

a A schematic showing the optical scheme of transmission X-ray microscopy (TXM) and a double-capillary sample design used for the experiment. b Photographs taken at the NSLS-II FXI beamline, 18-ID, NSLS-II showing the experimental setup, and c a representative TXM projection image (darker means higher X-ray attenuation) and reconstructed 3D volume rendering (the bounding box dimension is 36.8 × 36.8 × 45.5 μm3) of the microwire after a 10-min reaction, showing the progression of dealloying.