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

C. Wang; B. A. Sun; W. H. Wang; H. Y. Bai

doi:10.1063/1.4941320

Author(s)

C. Wang
B. A. Sun
W. H. Wang
H. Y. Bai

Related Research Unit(s)

Centre for Advanced Structural Materials

Detail(s)

Original language	English
Article number	54902
Journal / Publication	Journal of Applied Physics
Volume	119
Issue number	5
Publication status	Published - 7 Feb 2016

Link(s)

DOI	DOI https://doi.org/10.1063/1.4941320 Final Published version
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Attachment(s)	Documents 11862144.pdf Final Published version, 1.52 MB, PDF Publisher's Copyright Statement COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in C. Wang, B. A. Sun, W. H. Wang, and H. Y. Bai , "Chaotic state to self-organized critical state transition of serrated flow dynamics during brittle-to-ductile transition in metallic glass", Journal of Applied Physics 119, 054902 (2016) and may be found at https://doi.org/10.1063/1.4941320.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-84957557235&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(71676da0-9d43-4ea1-a680-d4a0a30bdb91).html

Abstract

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.