Fractal in fracture of bulk metallic glass

International audienceWe investigate the nanoscale periodic corrugation (NPC) structures on the dynamic fracture surface of a typical tough bulk metallic glass, submitted to high-velocity plate impact and scanned by atomic force microscopy (AFM). The detrended fluctuation analysis (DFA) of the recorded AFM profiles reveals that the valley landscapes of the NPC are nearly memoryless, characterized by Hurst parameter of 0.52 and exhibiting a self-similar fractal character with the dimension of about 1.48. Our findings confirm the existence of the ''quasi-cleavage'' fracture underpinned by tension transformation zones (TTZs) in metallic glasses. (C) 2010 Elsevier Ltd. All rights reserved