Effect of size and base-element on the jerky flow dynamics in metallic glass

Intrinsic versus extrinsic effects on serrated flow of bulk metallic glasses

“…5 shows the variation of the mean stress drop of Ds N and the mean awaiting time t L /t W with the Young's modulus E, while the other factors are fixed (d ¼ 2 mm, the strain rate _ ε ¼ 2.5 Â 10 À4 s À1 ). Clearly, a general decrease trend can be found for the mean stress drop Ds N and the mean t L /t W with E. Similar trend are recently reported by Ke et al [40] in the microcompression tests of MGs with different base-elements. The results seems indicate that the stiffer the BMG, the smaller the shear event is, the longer time the shear event wait to occur, and a more suppressed serrated flow.…”

“…Here, we take the method used in the Refs. [40] and [41] to normalize the serration magnitude (see Fig. 3(b)).…”

Micropillar compression testing of powders

“…4 exhibit the intermittent flow commonly observed during the microcompression testing of amorphous metals [24][25][26][36][37][38][39][40]. The shear offsets seen on the pillars' surfaces in the accompanying micrographs suggest that the pop-ins in these stress-strain curves correspond to shear banding events.…”

The mechanism of power-law scaling behavior by controlling shear bands in bulk metallic glass

“…However, their use as structural materials is severely limited due to their poor ductility and premature fracture at room temperature arising from shear localization [3][4][5][6]. While the mechanical properties of metallic glasses have been studied for many years, their underlying deformation mechanisms are fundamentally different from those of crystalline solids due to their lack of long-range atomic order and remain the subject of strong debate.…”