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Title: Loading-rate-independent delay of catastrophic avalanches in a bulk metallic glass

The plastic flow of bulk metallic glasses (BMGs) is characterized by intermittent bursts of avalanches, and this trend results in disastrous failures of BMGs. In the present work, a double-side-notched BMG specimen is designed, which exhibits chaotic plastic flows consisting of several catastrophic avalanches under the applied loading. The disastrous shear avalanches have, then, been delayed by forming a stable plastic-flow stage in the specimens with tailored distances between the bottoms of the notches, where the distribution of a complex stress field is acquired. Differing from the conventional compressive testing results, such a delaying process is independent of loading rate. The statistical analysis shows that in the specimens with delayed catastrophic failures, the plastic flow can evolve to a critical dynamics, making the catastrophic failure more predictable than the ones with chaotic plastic flows. Lastly, the findings are of significance in understanding the plastic-flow mechanisms in BMGs and controlling the avalanches in relating solids.
 [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [2] ;  [5] ;  [6]
  1. The Hong Kong Polytechnic Univ., Kowloon (Hong Kong)
  2. Shanghai Univ., Shanghai (China)
  3. The Hong Kong Polytechnic Univ., Kowloon (Hong Kong); Liaoning Univ. of Technology, Jinzhou (China)
  4. Zhengzhou Univ., Zhengzhou (China)
  5. Univ. of Illinois, Urbana-Champaign, IL (United States)
  6. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE); USDOE National Energy Technology Laboratory
Contributing Orgs:
The Hong Kong Polytechnic University, Hong Kong; Shangahi University, China; Liaoning University, China; Zhengzhou University, China; University of Illinois, Urbana-Champaign, IL (USA)
Country of Publication:
United States
condensed-matter physics; mechanical engineering
OSTI Identifier: