Crucial effect of angular flexibility on the fracture toughness and nano-ductility of aluminosilicate glasses

Mengyi Wang, Bu Wang, Tobias K. Bechgaard, John C. Mauro, Sylwester J. Rzoska, Michal Bockowski, Morten M. Smedskjaer, Mathieu Bauchy

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Understanding and controlling materials' resistance to fracture is critical for various applications. However, the structural origin of toughness, brittleness, and ductility remains poorly understood. Here, based on the experimental testing and atomistic simulations of a series of aluminosilicate glasses with varying thermal and pressure histories, we investigate the role of structure in controlling fracture toughness at fixed composition. We show that fracture toughness decreases with density, but strongly depends on the details of the temperature and pressure histories of the glass. This behavior is found to arise from a loss of nano-ductility rather than a loss of cohesion. Finally, we demonstrate that the propensity for nano-ductility is primarily controlled by the extent of angular flexibility between the rigid polytopes of the network. Tuning the extent of nano-ductility in silicate glasses would permit the design of ultra-tough glasses.

Original languageEnglish (US)
Pages (from-to)46-51
Number of pages6
JournalJournal of Non-Crystalline Solids
Volume454
DOIs
StatePublished - Dec 15 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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