Universality of slip avalanches in a ductile Fe-based bulk metallic glass

Jiao jiao Li, Jun wei Qiao, Karin A. Dahmen, Wei ming Yang, Bao long Shen, Ming wei Chen

Research output: Contribution to journalArticle

Abstract

Intermittent serrated flows of a novel ductile Fe60 Ni20 P13 C7 bulk metallic glass (BMG) at variant strain rates were investigated by statistics analysis. Peak and clutter distribution of slip-avalanche magnitudes are displayed during stable plastic flows at strain rates of 2×10−4 s−1 and 5×10−5 s−1, respectively, which means that serration behavior depends on the strain rate. However, the remarkable agreement between measured slip-avalanche magnitudes and the scaling behavior, i. e. a universal complementary cumulative distribution function (CCDF) predicted by mean-field theory (MFT) model, indicates that the plasticity of the present Fe-based BMGs can be tuned by imposed strain rates: Smax∼ɛ˙. This tuned plasticity is elucidated with expended free-volume model. Moreover, the scaling behavior of serrated flows for other strain rates can be predicted as well.

Original languageEnglish (US)
Pages (from-to)366-371
Number of pages6
JournalJournal of Iron and Steel Research International
Volume24
Issue number4
DOIs
StatePublished - Apr 2017

Keywords

  • Bulk metallic glass
  • Mean-field theory model
  • Plasticity
  • Slip avalanche
  • Strain rate

ASJC Scopus subject areas

  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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