3-D structures of crack-tip dislocations and their shielding effect revealed by electron tomography

Masaki Tanaka, Masaki Honda, Sunao Sadamatsu, Kenji Higashida

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

Three-dimensional structures of crack-tip dislocations in silicon crystals have been examined by combining scanning transmission electron microscopy and computed tomography. Cracks were introduced by a Vickers hardness tester at room temperature, and the sample was heated at 823 K for 1 h in order to introduce dislocations around the crack tips. Dislocation segments cut out from loops were observed around the crack tip, the three-dimensional structure of which was characterized by using by electron tomography. Their Burgers vectors including the sings were also determined by oscillating contrasts along dislocations. In order to investigate the effect of the dislocations on fracture behaviours, local stress intensity factor due to one dislocation was calculated, which indicates the dislocations observed were shielding type to increase fracture toughness.

本文言語英語
ページ(範囲)S55-S60
ジャーナルJournal of Electron Microscopy
59
SUPPL. 1
DOI
出版ステータス出版済み - 8 2010

All Science Journal Classification (ASJC) codes

  • Instrumentation

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