Strain rate-dependent avalanches in bulk metallic glasses

According to a simple mean-field model, two distinct types of slip avalanches during serrated plastic flows in bulk metallic glasses are extracted to distinguish the slipping modes of shear bands under various strain rates. Small avalanches propagate progressively, while large avalanches follow a si...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-05, Vol.864, p.158107, Article 158107
Main Authors: Luo, Y.S., Li, J.J., Wang, Z., Zhang, M., Qiao, J.W.
Format: Article
Language:English
Subjects:
Amorphous materials
Avalanches
Bulk metallic glass
Edge dislocations
Mean field model
Metallic glasses
Plastic deformation
Plastic flow
Shear bands
Shearing
Strain rate
Strain rates
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Summary:According to a simple mean-field model, two distinct types of slip avalanches during serrated plastic flows in bulk metallic glasses are extracted to distinguish the slipping modes of shear bands under various strain rates. Small avalanches propagate progressively, while large avalanches follow a simultaneous propagation. A weakening parameter and the critical size are defined for characterizing the two completely disparate shearing modes. The larger weakening and lower critical size mean more activated STZs, providing us a new method to explore more plasticity in bulk metallic glasses. •Small avalanches slip progressively with a power-law size distribution.•Large avalanches propagate simultaneously.•The critical size separates the small and large avalanches.•Small and larger avalanches are interspersed with each other throughout inelastic deformation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.158107