Crack-resistance curve of a Zr-Ti-Cu-Al bulk metallic glass with extraordinary fracture toughness

Qiang He, Jian Ku Shang, Evan Ma, Jian Xu

Research output: Contribution to journalArticlepeer-review

Abstract

For the emerging bulk metallic glasses (BMGs), damage tolerance is a key mechanical property needed for their practical applications. To reach a fracture toughness on a par with, or even better than, conventional engineering alloys, the only route reported so far is to compositionally base the BMG on high-cost palladium (Pd), which has a very high Poisson's ratio (∼0.42). Here we report the discovery of a Zr 61Ti 2Cu 25Al 12 (ZT1) BMG that has a toughness as high as the Pd-based BMG, but at the same time consists of common engineering metals and has robust glass-forming ability. The new BMG, while having an unimpressive Poisson's ratio of 0.367, derives its high toughness from its high propensity for crack deflection and local loading-mode change at the crack tip due to extensive shear band interactions. The crack-resistance curve (R-curve) of this BMG has been obtained from fatigue pre-crack samples, employing standard "single- specimen" and "multiple-specimen" techniques.

Original languageEnglish (US)
Pages (from-to)4940-4949
Number of pages10
JournalActa Materialia
Volume60
Issue number12
DOIs
StatePublished - Jul 1 2012

Keywords

  • Crack growth
  • Fracture toughness
  • Metallic glasses
  • R-curve
  • Zirconium alloys

ASJC Scopus subject areas

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

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