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Title: Tuned critical avalanche scaling in bulk metallic glasses

In this study, ingots of the bulk metallic glass (BMG), Zr64.13Cu15.75Ni10.12Al10 in atomic percent (at. %), are compressed at slow strain rates. The deformation behavior is characterized by discrete, jerky stress-drop bursts (serrations). Here we present a quantitative theory for the serration behavior of BMGs, which is a critical issue for the understanding of the deformation characteristics of BMGs. The mean-field interaction model predicts the scaling behavior of the distribution, D(S), of avalanche sizes, S, in the experiments. D(S) follows a power law multiplied by an exponentially-decaying scaling function. The size of the largest observed avalanche depends on experimental tuning-parameters, such as either imposed strain rate or stress. Similar to crystalline materials, the plasticity of BMGs reflects tuned criticality showing remarkable quantitative agreement with the slip statistics of slowly-compressed nanocrystals. The results imply that material-evaluation methods based on slip statistics apply to both crystalline and BMG materials.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [2] ;  [1] ;  [1]
  1. Univ. of Illinois Urbana-Champaign, Champaign, IL (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Taiyuan Univ. of Technology, Taiyuan (China)
  4. Univ. of Science and Technology, Beijing (China)
Publication Date:
OSTI Identifier:
1224526
Grant/Contract Number:
FE0011194
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 4; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois Urbana-Champaign, Champaign, IL (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE mechanical properties; metals and alloys; nonlinear phenomena; phase transitions and critical phenomena