Identification of crack path of inter- and transgranular fractures in sintered silicon nitride by in situ TEM

Seiichiro Ii, Chihiro Iwamoto, Katsuyuki Matsunaga, Takahisa Yamamoto, Yuichi Ikuhara

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Inter- and/or transgranular crack paths in sintered silicon nitride (Si3N4) during fracture were investigated by in situ straining experiments in a transmission electron microscope at room temperature, using a high-precision micro-indenter. By this technique, cracks introduced in an in situ manner were observed to propagate in the grain interior and along grain boundaries. High-resolution electron microscopy (HREM) observation revealed that the crack propagation takes place at an interface between Si 3N4 grains and an intergranular glassy film (IGF) in the case of intergranular fractures. According to the results by previous molecular dynamics simulations, a number of dangling bonds are present at the Si 3N4/IGF interface, which should result in the observed fracture behavior at the interface. On the other hand, the crack path introduced during transgranular fracture of Si3N4 grains was found to be sharp and straight. The observed crack propagated towards [1̄1̄20] inside the Si3N4 grain with the crack surface parallel to the (11̄00) plane. The HREM observations of crack walls revealed them to be atomically flat. The atomic termination of the crack walls was identified in combination with image simulations based on atomic models of the cleaved crack walls.

本文言語English
ページ(範囲)121-127
ページ数7
ジャーナルJournal of Electron Microscopy
53
2
DOI
出版ステータスPublished - 2004
外部発表はい

ASJC Scopus subject areas

  • 器械工学

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