Tuned critical avalanche scaling in bulk metallic glasses

James Antonaglia, Xie Xie, Gregory Schwarz, Matthew Wraith, Junwei Qiao, Yong Zhang, Peter K. Liaw, Jonathan T. Uhl, Karin A. Dahmen

Research output: Contribution to journalArticle

Abstract

Ingots of the bulk metallic glass (BMG), Zr64.13 Cu 15.75 Ni10.12 Al10 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.

Original languageEnglish (US)
Article number4382
JournalScientific reports
Volume4
DOIs
StatePublished - Mar 17 2014

ASJC Scopus subject areas

  • General

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    Antonaglia, J., Xie, X., Schwarz, G., Wraith, M., Qiao, J., Zhang, Y., Liaw, P. K., Uhl, J. T., & Dahmen, K. A. (2014). Tuned critical avalanche scaling in bulk metallic glasses. Scientific reports, 4, [4382]. https://doi.org/10.1038/srep04382