Structure mechanical properties, and dynamic fracture in nanophase silicon nitride via parallel molecular dynamics

Kenji Tsuruta, Andrey Omeltchenko, Aiichiro Nakano, Rajiv K. Kalia, Priya Vashishta

研究成果査読

抄録

Million-atom molecular-dynamics (MD) simulations are performed to study the structure, mechanical properties, and dynamic fracture in nanophase Si3N4. We find that intercluster regions are highly disordered: 50% of Si atoms in intercluster regions are three-fold coordinated. Elastic moduli of nanophase Si3N4 as a function of grain size and porosity are well described by a multiphase model for heterogeneous materials. The study of fracture in the nanophase Si3N4 reveals that the system can sustain an order-of-magnitude larger external load than crystalline Si3N4. This is due to branching and pinning of the crack front by nanoscale microstructures.

本文言語English
ページ(範囲)205-210
ページ数6
ジャーナルMaterials Research Society Symposium - Proceedings
457
出版ステータスPublished - 1997
外部発表はい
イベントProceedings of the 1996 MRS Fall Symposium - Boston, MA, USA
継続期間: 12月 2 199612月 5 1996

ASJC Scopus subject areas

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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