Structural relaxation and self-repair behavior in nano-scaled Zr-Cu metallic glass under cyclic loading: Molecular dynamics simulations

Yu-Chieh Lo, H. S. Chou, Y. T. Cheng, J. C. Huang*, J. R. Morris, P. K. Liaw

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Bulk metallic glasses are generally regarded as highly brittle materials at room temperature, with deformation localized within a few principal shear bands. In this simulation work, it is demonstrated that when the Zr-Cu metallic glass is in a small size-scale, it can deform under cyclic loading in a semi-homogeneous manner without the occurrence of pronounced mature shear bands. Instead, the plastic deformation in simulated samples proceeds via the network-like shear-transition zones (STZs) by the reversible and irreversible structure-relaxations during cyclic loading. Dynamic recovery and reversible/irreversible structure rearrangements occur in the current model, along with annihilation/creation of excessive free volumes. This behavior would in-turn retard the damage growth of metallic glass. Current studies can help to understand the structural relaxation mechanism in metallic glass under loading. The results also imply that the brittle bulk metallic glasses can become ductile with the sample size being reduced. The application of metallic glasses in the form of thin film or nano pieces in micro-electro-mechanical systems (MEMS) could be promising.

Original languageEnglish
Pages (from-to)954-960
Number of pages7
JournalIntermetallics
Volume18
Issue number5
DOIs
StatePublished - 1 May 2010

Keywords

  • B. Fatigue resistance and crack growth
  • B. Glasses, metallic
  • B. Plastic deformation mechanisms
  • E. Simulations, atomistic

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