Role of ultrafine microstructures in dynamic fracture in nanophase silicon nitride

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

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Using 106-atom molecular-dynamics simulations, we investigate dynamic fracture in nanophase Si3N4. The simulations reveal that intercluster regions are amorphous, and they deflect cracks and give rise to local crack branching. As a result, the nanophase system is able to sustain an order-of-magnitude larger external strain than crystalline Si3N4. We also determine the morphology of fracture surfaces: For in-plane fracture surface profiles the roughness exponent ζ = 0.57 and for out-of-plane profiles the exponents ζ = 0.84 and ζ|| = 0.75 are in excellent agreement with experiments.

Original languageEnglish
Pages (from-to)2144-2147
Number of pages4
JournalPhysical Review Letters
Volume78
Issue number11
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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