Chaotic state to self-organized critical state transition of serrated flow dynamics during brittle-to-ductile transition in metallic glass

Journal Article · Sun Feb 07 04:00:00 EST 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4941320· OSTI ID:22494980

Wang, C.; Wang, W. H.; Sun, B. A. ^[1]

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1. Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon (Hong Kong)

We study serrated flow dynamics during brittle-to-ductile transition induced by tuning the sample aspect ratio in a Zr-based metallic glass. The statistical analysis reveals that the serrated flow dynamics transforms from a chaotic state characterized by Gaussian-distribution serrations corresponding to stick-slip motion of randomly generated and uncorrelated single shear band and brittle behavior, into a self-organized critical state featured by intermittent scale-free distribution of shear avalanches corresponding to a collective motion of multiple shear bands and ductile behavior. The correlation found between serrated flow dynamics and plastic deformation might shed light on the plastic deformation dynamic and mechanism in metallic glasses.

• OSTI ID: 22494980
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 5 Vol. 119; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASPECT RATIO
BRITTLE-DUCTILE TRANSITIONS
CHAOS THEORY
GAUSS FUNCTION
METALLIC GLASSES
PLASTICITY
RANDOMNESS
SHEAR
SLIP
TUNING