Structural origin of intrinsic ductility in binary aluminosilicate glasses

Jian Luo, K. Deenamma Vargheese, Adama Tandia, Jason T. Harris, John C. Mauro

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We evaluate the fracture mechanism in the binary aluminosilicate glasses using molecular dynamics simulations. The simulations using two independent force fields reveal that increasing the alumina content promotes shear and suppresses fracture, thereby increasing the intrinsic ductility, in agreement with experimental observations. In indentation simulations, it is directly demonstrated that the deformation mechanism shifts from densification to shear flow with the increase in alumina content. The origin of this intrinsic ductility is that the Al atoms are more amenable to plastic flow and can reduce the creation of lower coordinated weak spots during deformation.

Original languageEnglish (US)
Pages (from-to)297-306
Number of pages10
JournalJournal of Non-Crystalline Solids
Volume452
DOIs
StatePublished - Nov 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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