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Tuned critical avalanche scaling in bulk metallic glasses.


ABSTRACT: 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.

SUBMITTER: Antonaglia J 

PROVIDER: S-EPMC3955902 | biostudies-other | 2014

REPOSITORIES: biostudies-other

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Tuned critical avalanche scaling in bulk metallic glasses.

Antonaglia James J   Xie Xie X   Schwarz Gregory G   Wraith Matthew M   Qiao Junwei J   Zhang Yong Y   Liaw Peter K PK   Uhl Jonathan T JT   Dahmen Karin A KA  

Scientific reports 20140317


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,  ...[more]

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