Chaotic dynamics in shear-band-mediated plasticity of metallic glasses

Baoan Sun, Liping Yu, Gang Wang, Xing Tong, Chuan Geng, Jingtao Wang, Jingli Ren, and Weihua Wang
Phys. Rev. B 101, 224111 – Published 16 June 2020
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Abstract

The chaotic dynamics describes how a small change of initial conditions can result in a large difference in a deterministic nonlinear system, i.e., the “butterfly effect.” Through a combination of experimental and theoretical analysis, here we showed unambiguously that the deformation of metallic glasses (MGs) exhibits such an effect where the experimentally observed plasticity displays a large plasticity fluctuation under the normally same conditions. The “butterfly effect” for the plasticity of MGs is related to the chaotic dynamics of a shear band, evidenced by the existence of a torus destroyed phase diagram, a positive Lyapunov exponent, and a fractional Lyapunov dimension. Physically, the chaotic shear-band dynamics arises from the interplay between structural disordering and temperature rise within the shear band, which could lead to an uncertainty in the appearance of the critical condition for runaway shear banding events. Our results provide a perspective on the plasticity of MGs from the viewpoint of complex dynamics and are also important for evaluating the plastic deformation properties of MGs in practical applications.

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  • Received 13 February 2020
  • Revised 26 May 2020
  • Accepted 2 June 2020

DOI:https://doi.org/10.1103/PhysRevB.101.224111

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Baoan Sun1,2,*, Liping Yu3,*, Gang Wang4, Xing Tong4, Chuan Geng4, Jingtao Wang5, Jingli Ren6,†, and Weihua Wang1,2,‡

  • 1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
  • 3College of Science, Henan University of Technology, Zhengzhou 450001, China
  • 4Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
  • 5Herbert Gleiter Institute For Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China
  • 6Henan Academy of Big Data, Zhengzhou University, Zhengzhou 450052, China

  • *These authors contributed equally to this work.
  • renjl@zzu.edu.cn
  • whw@iphy.ac.cn

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Issue

Vol. 101, Iss. 22 — 1 June 2020

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