The developed samples were studied using the highresolution
micro-CT system SkyScan 1172 (SkyScan,
Belgium). The system was controlled by means of a PC
workstation. Scanning of the specimens was conducted
with 180 rotation around the vertical axis and a single
rotation step of 0.4. The cross-sectional pixel size was
4.01 lm. After a half circle (180) was completed, the
entire set of radiographs was synthesized by computer
software. The reconstructed 2D images were saved as a
stack of uncompressed 16-bit TIFF files. These TIFF files
were then used to create a three-dimensional (3D) image
of microstructure with the software Image-Pro Plus 6.1.