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SEM images of the liquid nitrogen brittle section and tensile section (TS) of (a) son-FG/MCC 5, (b) son-FG/MCC 10, (c) son-FG/MCC 15, (d) son-FG/MCC 20, (e) son-FG/MCC 5 TS (f) son-FG/MCC 10 TS, (g) son-FG/MCC 15 TS and (h) son-FG/MCC 20 TS treated by ultrasound.
