Experimental characterization of shear transformation zones for plastic flow of bulk metallic glasses

D. Pan, A. Inoue, T. Sakurai, M. W. Chen

Research output: Contribution to journalArticlepeer-review

425 Citations (Scopus)

Abstract

We report experimental characterization of shear transformation zones (STZs) for plastic flow of bulk metallic glasses (BMGs) based on a newly developed cooperative shearing model [Johnson WL, Samwer K (2005) A universal criterion for plastic yielding of metallic glasses with a (T/Tg) 2/3 temperature dependence. Phys Rev Lett 95: 195501]. The good agreement between experimental measurements and theoretical predictions in the STZ volumes provides compelling evidence that the plastic flow of metallic glasses occurs through cooperative shearing of unstable STZs activated by shear stresses. Moreover, the ductility of BMGs was found to intrinsically correlate with their STZ volumes. The experiments presented herein pave a way to gain a quantitative insight into the atomic-scale mechanisms of BMG mechanical behavior.

Original languageEnglish
Pages (from-to)14769-14772
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Volume105
Issue number39
DOIs
Publication statusPublished - 2008 Sep 30
Externally publishedYes

Keywords

  • Cooperative shearing model
  • Mechanical property
  • Nanoindentation
  • Shear band
  • Strain rate sensitivity

ASJC Scopus subject areas

  • General

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