Temperature rises during strain-rate dependent avalanches in bulk metallic glasses

J. J. Li, J. F. Fan, Z. Wang, Y. C. Wu, K. A. Dahmen, J. W. Qiao

Research output: Contribution to journalArticlepeer-review

Abstract

Localized heating during slip avalanches is relevant to the understanding of the transition from shear banding to cracking in bulk metallic glasses (BMGs). Here we focus on the released elastic energies (incorporating the influence of machine stiffness) and avalanche durations for regularly appearing large avalanches to study the maximum temperature increases of a Zr-based BMG compressed at three strain rates of 3 × 10−5, 3 × 10−4, and 3 × 10−3 s−1. The maximum released elastic energies during slip avalanches decrease with the increase of strain rates. The durations of the avalanches are on the scale of tens of milliseconds for each strain rate. As strain rate increases, the maximum temperature rises due to shear-band slips are decreased from 2.6, 2.3 to 1.9 K. Moderate heating during the large slip avalanches for three strain rate implies that thermal softening has only a small effect on the shear-banding instability.

Original languageEnglish (US)
Article number106637
JournalIntermetallics
Volume116
DOIs
StatePublished - Jan 2020

Keywords

  • Bulk metallic glasses
  • Shear banding
  • Slip avalanches
  • Strain rates
  • Temperature rises
  • Thermal softening

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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