TEM in situ observation of fracture behavior in ceramic materials

S. Ii, C. Iwamoto, K. Matsunaga, T. Yamamoto, Y. Ikuhara

研究成果: Article査読

15 被引用数 (Scopus)

抄録

The atomic structures of crack walls due to cleavage fracture in silicon nitride (Si 3 N 4 ) and magnesium oxide (MgO) have been investigated by in situ straining transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) at room temperature. In the case of Si 3 N 4 , the crack walls on the (1 1̄ 0 0) plane were atomically flat, which indicates that the crack propagated along a particular crystal plane without deflection. On the other hand, the cleaved crack walls in MgO were not atomically flat but contained a number of square-shaped steps with a few {0 1 0} atomic layers in height. Thus, it can be said that the cleavage crack was deflected at the atomic level during its rapid propagation. The origin of their step structures is discussed using results from molecular dynamics (MD) simulations.

本文言語English
ページ(範囲)68-74
ページ数7
ジャーナルApplied Surface Science
241
1-2 SPEC. ISS.
DOI
出版ステータスPublished - 2005 2月 28
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 物理学および天文学(全般)
  • 表面および界面
  • 表面、皮膜および薄膜

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