Fig. 4

SEM micrograph at 50000x magnification (a), and EDX spectrum and results (b) of 0CrCaB sample after heat-treated at 700 °C for 2 h.

SEM micrograph at 50000x magnification (a), and EDX spectrum and results (b) of 0CrCaB sample after heat-treated at 700 °C for 2 h.