Dynamic properties of major shear bands in Zr-Cu-Al bulk metallic glasses

P. Thurnheer, R. Maaß, K. J. Laws, S. Pogatscher, J. F. Löffler

Research output: Contribution to journalArticle

Abstract

We present a systematic investigation of shear-band dynamics as a function of chemical composition in the ZrxCu90-xAl10 (x = 45-65) metallic glass system. We investigate aging dynamics in the non-serrated flow regime, shear-band velocities in the serrated flow regime, the transition between these two flow modes, and the transition from ductile to brittle behavior. We find that the activation energy for shear-band propagation is largely determined by the underlying time scales of the shear process, and that temperature-dependent stress drops only play a minor role. The activation energy as a function of composition can be linked to the bonding strength between the fastest diffusor, Cu, and its coordinating atoms, represented by the ratio of strong Cu-Zr to weaker Cu-Cu bonds. This indicates that the resistance to accelerated shear, i.e. the apparent activation barrier, is primarily controlled by a chemical nearest-neighbor effect.

Original languageEnglish (US)
Pages (from-to)428-436
Number of pages9
JournalActa Materialia
Volume96
DOIs
StatePublished - Jul 29 2015

Keywords

  • Dynamics
  • Inhomogeneous deformation
  • Metallic glasses
  • Serrated flow
  • Shear bands

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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