Fig. 2: In situ synchrotron X-ray nano-tomography on Ni–20Cr reacting with KCl–MgCl2 molten salt at 800 °C.
a Pseudo-2D cross-sectional view (XY) of the full microwire and 3D visualization of a volume of interest (marked with a red rectangle) showing the morphological evolution of the Ni–20Cr microwire. A schematic shows the formation of bicontinuous porous structure during dealloying and the growth of the feature size for pores and ligaments due to coarsening. b–e Quantitative analysis of the 3D morphological characteristics including the remaining volume and loss volume of the solid phase, porosity, average ligament feature size, and fitted average wire diameter as a function of reaction time at 800 °C. The blue-shaded range in d corresponds to the size distribution of the bicontinuous features. Error bars in e indicate the standard deviation from different pseudo-cross-section slices.
